E2e workflow (#21)

Reviewed-on: #21
Co-authored-by: Mathias Scheider <mathias2784@web.de>

.env.template

@@ -1,3 +1,10 @@
 LLM_API_BASE_URL = "http://localhost:1234/v1"
 LLM_API_KEY = "not-relevant"
 LLM_DEFAULT_TEMPERATURE = 1.0
+
+METADATA_PREFIX = "photools|"
+LOG_LEVEL=INFO
+LLM_REQUEST_TIMEOUT_SECONDS=10
+LLM_MAX_COMPLETION_TOKENS=1024
+LLM_MAX_RETRIES=5
+LLM_MAX_KEYWORDS=15

.gitea/workflows/ci.yml

@@ -18,9 +18,20 @@ jobs:
         run: uv sync --frozen
       - name: copy env
         run: cp .env.template .env
+      - name: Install exiftool (system dependency)
+        run: |
+          if command -v exiftool >/dev/null 2>&1; then
+            echo "exiftool already installed"
+          elif command -v sudo >/dev/null 2>&1; then
+            sudo apt-get update && sudo apt-get install -y --no-install-recommends libimage-exiftool-perl
+          else
+            apt-get update && apt-get install -y --no-install-recommends libimage-exiftool-perl
+          fi
       - name: Run pytest
         run: uv run pytest .
-      - name: Check formatting (black)
-        run: uv run black --check . --extend-exclude .venv
       - name: Lint (ruff)
         run: uv run ruff check .
+      - name: Typing (mypy)
+        run: uv run mypy .
+      - name: Check formatting (black)
+        run: uv run black --check . --extend-exclude .venv

AGENTS.md

@@ -1,22 +1,42 @@
 # Agent Instructions: PhotoTools3
 
 ## Environment Setup
+
 Requires a `.env` file with the following variables:
+
 - `llm_api_key`: API key for the LLM provider.
 - `llm_api_base_url`: Base URL for the LLM API.
 - `llm_default_temperature`: Float value for temperature.
 
+## System Dependencies
+
+- `exiftool` binary: required by `pyexiftool` at runtime, not installable via pip/uv.
+  - Arch: `perl-image-exiftool`
+  - Debian/Ubuntu: `libimage-exiftool-perl`
+
 ## Development Toolchain
+
 - **Dependency Management**: Use `uv`.
 - **Python Version**: Requires Python `>=3.14`.
 - **Testing**: Run `pytest` to execute the test suite in `test/`.
 - **Linting & Formatting**: Use `ruff` and `black`.
 
 ## CLI Usage
+
 The primary entry point is the `photools3` command:
+
 - `photools3 keywords <image_path>`: Extracts keywords and captions from a single image.
 
 ## Architecture & Logic
+
 - **`src/photools3/photo.py`**: Core image processing logic, including resizing, RGB conversion, and generating base64 JPEG encodings specifically for LLM vision compatibility.
 - **`src/photools3/llm_session.py`**: Manages the workflow of sending processed images to the LLM and parsing results.
 - **Configuration**: The list of keywords to extract is maintained in `config/keywords.txt`.
+
+## Code style
+
+- Avoid overly verbose docstrings or comments. Be precise!
+
+## Comunication
+
+- When done with code modifications, give a one-liner for the currently unstaged changes that can be used as a commit message.

README.md

@@ -0,0 +1,101 @@
+# PhotoTools3
+
+PhotoTools3 uses an OpenAI-compatible vision API to generate photo captions and
+keywords, then writes the results to photo metadata. It can also assess photo
+quality.
+
+## Setup
+
+Install the Python dependencies with `uv` and make sure ExifTool is installed and
+available on `PATH` (it is a system dependency, not a Python package):
+
+```bash
+uv sync
+```
+
+Create a `.env` file in the project root with the LLM connection details and the
+prefix used to identify metadata written by PhotoTools3:
+
+```dotenv
+llm_api_base_url=http://localhost:1234/v1
+llm_api_key=your-api-key
+llm_default_temperature=0.2
+metadata_prefix=photools3:
+LOG_LEVEL=DEBUG
+LLM_REQUEST_TIMEOUT_SECONDS=10
+LLM_MAX_COMPLETION_TOKENS=1024
+LLM_MAX_RETRIES=5
+LLM_MAX_KEYWORDS=15
+```
+
+Keyword suggestions are restricted to the vocabulary in `config/keywords.txt`.
+`LOG_LEVEL=DEBUG` enables detailed per-request and per-photo timings.
+`LLM_MAX_RETRIES` controls retries for malformed or structurally invalid
+responses; `5` means up to 6 requests for a photo. A valid response with
+unsupported keywords gets at most one targeted correction retry, then remaining
+invalid keywords are discarded.
+Each request is limited by `LLM_REQUEST_TIMEOUT_SECONDS`; a timeout reloads the
+LM Studio model before retrying. `LLM_MAX_COMPLETION_TOKENS` caps the generated
+response length. When all retries are exhausted, the model is reloaded before
+the failed photo is reported. `LLM_MAX_KEYWORDS` sets the maximum number of
+distinct keywords requested and stored per photo; excess keywords are discarded.
+
+## Generate metadata
+
+The `metadata-magic` command accepts one or more image paths and/or directories.
+The default mode is `both`, which generates and writes a caption and keywords:
+
+```bash
+uv run photools3 metadata-magic photo.dng
+```
+
+Choose a mode with `--mode`:
+
+```bash
+# Generate only keywords
+uv run photools3 metadata-magic photo.dng --mode keywords
+
+# Generate only a caption
+uv run photools3 metadata-magic photo.dng --mode captions
+
+# Explicitly request both (the default)
+uv run photools3 metadata-magic photo.dng --mode both
+```
+
+Pass multiple files to process them sequentially as a batch:
+
+```bash
+uv run photools3 metadata-magic photo1.dng photo2.jpg --mode both
+```
+
+Directories are scanned at the top level by default. Add `--recursive` to
+include supported images in subdirectories. You can combine directories and
+individual file paths:
+
+```bash
+uv run photools3 metadata-magic ./photos --recursive --mode keywords
+uv run photools3 metadata-magic ./photos photo-to-include.dng --mode captions
+```
+
+The command reports each processed file and exits with a non-zero status if any
+file fails. In a batch, it continues processing the remaining files after an
+individual failure. Generated metadata is written using ExifTool and XMP
+sidecars.
+
+## Assess photo quality
+
+The `quality` command reports an assessment without changing photo metadata:
+
+```bash
+uv run photools3 quality photo.dng
+```
+
+## Help
+
+Show the available commands and options with:
+
+```bash
+uv run photools3 --help
+uv run photools3 metadata-magic --help
+uv run photools3 quality --help
+```

pyproject.toml

@@ -9,14 +9,16 @@ authors = [
 requires-python = ">=3.14"
 dependencies = [
     "black>=26.5.1",
+    "mypy>=2.4.0",
     "openai>=3.22.0",
     "pillow>=12.3.0",
     "pydantic>=2.13.5",
     "pydantic-settings>=2.15.0",
+    "pyexiftool>=0.5.6",
     "pytest>=9.1.1",
     "ruff>=0.16.9",
     "typer>=0.12.0",
-    "utils>=0.1.2",
+    "utils>=0.1.3",
 ]
 
 [project.scripts]
@@ -29,6 +31,13 @@ build-backend = "uv_build"
 [tool.uv.sources]
 utils = { index = "gitea" }
 
+[tool.black]
+target-version = [ "py314" ]
+
+[[tool.mypy.overrides]]
+module = ["exiftool", "exiftool.*", "utils", "utils.*"]
+ignore_missing_imports = true
+
 [[tool.uv.index]]
 name = "gitea"
 url = "https://gitea.schneiderserver.site/api/packages/mathias2784/pypi/simple"

src/photools3/cli.py

@@ -3,16 +3,30 @@ from pathlib import Path
 from typing import Annotated
 
 import typer
+from PIL import Image
 from utils.logging_config import LoggingSettings
 
-from photools3.llm_session import (
-    LlmSessionCaptionsAndKeywords,
-    LlmSessionQuality,
-)
+from photools3.llm_session import LlmSessionQuality
 from photools3.photo import Photo
+from photools3.processing import (
+    ProcessingMode,
+    process_batch,
+    process_photo,
+)
+from photools3.settings import settings
 
 app = typer.Typer(help="PhotoTools3: A CLI for image processing.")
-LoggingSettings()
+LoggingSettings(LOG_LEVEL=settings.log_level)
+for name in (
+    "uvicorn",
+    "uvicorn.error",
+    "uvicorn.access",
+    "PIL",
+    "openai",
+    "httpx2",
+    "httpcore2",
+):
+    logging.getLogger(name).setLevel(logging.WARNING)
 logger = logging.getLogger(__name__)
 
 
@@ -21,9 +35,7 @@ def main(
     ctx: typer.Context,
     version: bool | None = typer.Option(None, "--version", is_eager=True),
 ):
-    """
-    Main entry point for PhotoTools3 CLI.
-    """
+    """Main entry point for PhotoTools3 CLI."""
     if version:
         typer.echo("photools3 version 0.1.0")
         raise typer.Exit()
@@ -33,36 +45,118 @@ def main(
         raise typer.Exit()
 
 
-@app.command("keywords")
-def keywords(
-    file_path: Annotated[Path, typer.Argument(..., help="Path to the image file")],
+@app.command("metadata-magic")
+def metadata_magic(
+    paths: Annotated[
+        list[Path], typer.Argument(..., help="Photo file(s) and/or directory paths")
+    ],
+    mode: Annotated[
+        ProcessingMode,
+        typer.Option(
+            "--mode",
+            case_sensitive=False,
+            help="Metadata to generate and write",
+        ),
+    ] = ProcessingMode.BOTH,
+    recursive: Annotated[
+        bool,
+        typer.Option(
+            "--recursive/--no-recursive",
+            help="Recursively discover photos inside input directories",
+        ),
+    ] = False,
 ):
-    session = LlmSessionCaptionsAndKeywords()
-    _run_llm_task(file_path, session)
+    """Generate and write keywords, captions, or both for photos."""
+    _run_processing(paths, mode, recursive)
 
 
 @app.command("quality")
 def quality(
     file_path: Annotated[Path, typer.Argument(..., help="Path to the image file")],
 ):
-    session = LlmSessionQuality()
-    _run_llm_task(file_path, session)
-
-
-def _run_llm_task(
-    file_path: Path, session: LlmSessionCaptionsAndKeywords | LlmSessionQuality
-):
+    """Assess a photo's quality without changing its metadata."""
     try:
-        logger.info(f"Processing: {file_path}")
-        photo = Photo(file_path)
-        result = session.call([photo])
-        logger.info(result)
+        with LlmSessionQuality() as session, Photo(file_path) as photo:
+            result = session.call([photo])
+        logger.info("Quality assessment for %s: %s", file_path, result)
     except FileNotFoundError:
-        logger.error(f"Error: File '{file_path}' does not exist.")
+        logger.error("Photo not found: %s", file_path)
+        raise typer.Exit(code=1) from None
+    except Exception as exc:
+        logger.error("Error assessing photo %s: %s", file_path, exc)
+        raise typer.Exit(code=1) from exc
+
+
+def _run_processing(inputs: list[Path], mode: ProcessingMode, recursive: bool) -> None:
+    photo_paths = _expand_photo_paths(inputs, recursive)
+    if not photo_paths:
+        logger.error("No supported photo files found in the given input paths.")
         raise typer.Exit(code=1)
-    except Exception as e:  # noqa: BLE001
+
+    logger.info("Processing %d photo(s) in %s mode", len(photo_paths), mode.value)
+    if len(photo_paths) == 1:
+        path = photo_paths[0]
+        try:
+            process_photo(path, mode)
+        except FileNotFoundError:
+            logger.error("Photo not found: %s", path)
+            raise typer.Exit(code=1) from None
+        except Exception as exc:
+            logger.error("Failed to process %s: %s", path, exc)
+            raise typer.Exit(code=1) from exc
+        logger.info("Processed: %s", path)
+        return
+
+    try:
+        outcomes = process_batch(photo_paths, mode)
+    except Exception as exc:
+        logger.error("Batch processing failed: %s", exc)
+        raise typer.Exit(code=1) from exc
+
+    failures = 0
+    for outcome in outcomes:
+        if outcome.succeeded:
+            logger.info("Processed: %s", outcome.path)
+        else:
+            failures += 1
+            logger.error("Failed to process %s: %s", outcome.path, outcome.error)
+
+    logger.info(
+        "Batch complete: %d succeeded, %d failed", len(outcomes) - failures, failures
+    )
+    if failures:
         raise typer.Exit(code=1)
-        logger.error(f"Error processing image: {e}")
+
+
+def _expand_photo_paths(inputs: list[Path], recursive: bool) -> list[Path]:
+    """Expand directories to supported image files, preserving input order."""
+    supported_extensions = {
+        ".dng",
+        *(extension.lower() for extension in Image.registered_extensions()),
+    }
+    discovered: list[Path] = []
+
+    for path in inputs:
+        if not path.is_dir():
+            discovered.append(path)
+            continue
+
+        try:
+            candidates = path.rglob("*") if recursive else path.iterdir()
+            discovered.extend(
+                sorted(
+                    candidate
+                    for candidate in candidates
+                    if candidate.is_file()
+                    and candidate.suffix.lower() in supported_extensions
+                )
+            )
+        except OSError as exc:
+            logger.error("Could not read directory %s: %s", path, exc)
+            raise typer.Exit(code=1) from exc
+
+    # Avoid processing the same exact path more than once while retaining order.
+    return list(dict.fromkeys(discovered))
 
 
 if __name__ == "__main__":

src/photools3/llm_session.py

@@ -1,38 +1,69 @@
 import json
 import logging
 import re
+import time
 
 import openai
 from openai import OpenAI
-from pydantic import ValidationError
+from pydantic import BaseModel, ValidationError
 
+from photools3.lm_studio import LMStudioModelManager
 from photools3.models import (
     LlmMessageContent,
     LlmMessageRole,
     LlmMessageType,
     LlmRequest,
     LlmRequestMessage,
+    LlmResponseCaption,
     LlmResponseCaptionsAndKeywords,
     LlmResponseGeneral,
+    LlmResponseKeywords,
     LlmResponseQuality,
+    load_valid_keywords,
 )
 from photools3.photo import Photo
-from photools3.settings import Settings
+from photools3.settings import settings
 
 logger = logging.getLogger(__name__)
 
-settings = Settings()  # type: ignore[reportCallIssue]
+
+def _clean_llm_response(txt: str):
+    # remove ```json ... ``` wrap
+    txt = re.sub(r"^```json(.*)```$", r"\1", txt, flags=re.DOTALL).strip()
+    return txt
+
+
+def _correction_prompt(instruction: str) -> LlmRequestMessage:
+    return LlmRequestMessage(
+        role=LlmMessageRole.user,
+        content=instruction,
+    )
+
+
+def _request_with_correction(base_request: LlmRequest, instruction: str) -> LlmRequest:
+    return base_request.model_copy(
+        update={"messages": [*base_request.messages, _correction_prompt(instruction)]}
+    )
+
+
+def _validation_summary(exception: ValidationError) -> str:
+    return "; ".join(
+        f"{'.'.join(map(str, error['loc']))}: {error['msg']}"
+        for error in exception.errors(include_input=False)
+    )
 
 
 class LlmSession:
     base_url: str = str(settings.llm_api_base_url)
     api_key: str = settings.llm_api_key
-    response_model = LlmResponseGeneral
+    response_model: type[BaseModel] = LlmResponseGeneral
+    prompt: str = ""
 
     def __init__(
         self, system_prompt: str, temperature: float = settings.llm_default_temperature
     ):
         self._models: list = []
+        self._model_id: str | None = None
 
         self.system_prompt = system_prompt
         self.temperature = temperature
@@ -40,10 +71,30 @@ class LlmSession:
         self.client = OpenAI(
             base_url=self.base_url,
             api_key=self.api_key,
+            max_retries=0,
         )
+        self._model_manager = LMStudioModelManager(self.base_url, self.api_key)
+
+    def close(self):
+        self.client.close()
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        self.close()
+
+    def flush_model(self):
+        """Unload and reload this session's model through LM Studio."""
+        if self._model_id is None:
+            self._model_id = self.models[0].id
+        self._model_manager.reload_model(self._model_id)
 
     def client_chat_completion_create(self, request: LlmRequest, choice_no: int = 0):
-        response = self.client.chat.completions.create(**request.model_dump())
+        response = self.client.chat.completions.create(
+            **request.model_dump(),
+            timeout=settings.llm_request_timeout_seconds,
+        )
         return response.choices[choice_no].message.content
 
     def is_api_reachable(self) -> bool:
@@ -61,52 +112,141 @@ class LlmSession:
 
     def call(
         self,
-        prompt: str,
         photos: list[Photo],
         model_id=None,
-        max_retries: int = 2,
+        max_retries: int | None = None,
+        prompt: str | None = None,
     ):
-        if not model_id:
-            model_id = self.models[0].id
+        retry_limit = settings.llm_max_retries if max_retries is None else max_retries
+        if retry_limit < 0:
+            raise ValueError("max_retries must be greater than or equal to zero")
 
-        request = self._build_request(prompt, photos, model_id)
+        if model_id is None:
+            if self._model_id is None:
+                self._model_id = self.models[0].id
+            model_id = self._model_id
+        else:
+            self._model_id = model_id
 
-        last_error = None
-        for attempt in range(max_retries + 1):
+        base_request = self._build_request(prompt or self.prompt, photos, model_id)
+        request = base_request
+        tag_correction_used = False
+        valid_keywords = load_valid_keywords()
+        max_keywords = settings.llm_max_keywords
+
+        for attempt in range(retry_limit + 1):
+            request_started = time.perf_counter()
             try:
                 result_raw = self.client_chat_completion_create(request)
-                # Clean the response (strip markdown code blocks if present)
-                json_str = re.sub(
-                    r"^```json(.*)```$", r"\1", result_raw, flags=re.DOTALL
-                ).strip()
+            except openai.APITimeoutError as exc:
+                logger.warning(
+                    "LLM request timed out after %.2f seconds; reloading model",
+                    time.perf_counter() - request_started,
+                )
+                self.flush_model()
+                if attempt < retry_limit:
+                    continue
+                raise ValueError(
+                    f"LLM request timed out after {retry_limit + 1} attempts"
+                ) from exc
+            except Exception:
+                logger.debug(
+                    "LLM request attempt %d/%d failed after %.2f seconds",
+                    attempt + 1,
+                    retry_limit + 1,
+                    time.perf_counter() - request_started,
+                )
+                raise
 
-                # Parse and validate against the class-level response_model
-                return self.response_model.model_validate_json(json_str)
-
-            except (json.JSONDecodeError, ValidationError) as e:
-                last_error = e
-                if attempt < max_retries:
-                    logger.info("Chatbot response is invalid; promting to correct ...")
-                    # Prepare a correction prompt
-                    correction_prompt = (
-                        f"The previous response was invalid due to: {e}. "
-                        f"Please provide the corrected JSON based on this content: "
-                        f"{json_str if 'json_str' in locals() else 'the original input'}"
-                    )
-                    # Append correction prompt as a new user message for the next attempt
-                    request.messages.append(
-                        LlmRequestMessage(
-                            role=LlmMessageRole.user,
-                            content=correction_prompt,
-                        )
+            logger.debug(
+                "LLM request attempt %d/%d completed in %.2f seconds",
+                attempt + 1,
+                retry_limit + 1,
+                time.perf_counter() - request_started,
+            )
+            try:
+                response_data = json.loads(_clean_llm_response(result_raw))
+            except (json.JSONDecodeError, TypeError) as exc:
+                if attempt < retry_limit:
+                    logger.info("Chatbot response was not valid JSON; retrying")
+                    request = _request_with_correction(
+                        base_request,
+                        "Return one complete JSON object matching the schema. "
+                        f"The previous response was invalid: {exc}",
                     )
                     continue
-                else:
-                    raise ValueError(
-                        f"Failed to parse or validate LLM response after {max_retries} retries: {e}"
+
+                logger.warning(
+                    "LLM retry limit reached; reloading model before failing"
+                )
+                self.flush_model()
+                raise ValueError(
+                    f"Failed to parse LLM response after {retry_limit} retries: {exc}"
+                ) from exc
+
+            if (
+                isinstance(response_data, dict)
+                and "tags" in self.response_model.model_fields
+                and isinstance(response_data.get("tags"), list)
+            ):
+                tags = response_data["tags"]
+                considered_tags = tags[:max_keywords]
+                invalid_tags = [
+                    tag
+                    for tag in considered_tags
+                    if not isinstance(tag, str) or tag not in valid_keywords
+                ]
+
+                if invalid_tags and not tag_correction_used and attempt < retry_limit:
+                    tag_correction_used = True
+                    logger.info(
+                        "LLM returned unsupported keywords; requesting one correction"
                     )
-            except Exception:
-                raise
+                    request = _request_with_correction(
+                        base_request,
+                        f"These keywords are not allowed: {invalid_tags!r}. "
+                        "Replace them with exact allowed keywords when sensible; "
+                        f"otherwise omit them. Return at most {max_keywords} "
+                        "distinct keywords and do not list the vocabulary.",
+                    )
+                    continue
+
+                if len(tags) > max_keywords:
+                    logger.info(
+                        "Discarding keywords beyond configured limit of %d",
+                        max_keywords,
+                    )
+                if invalid_tags:
+                    logger.warning("Discarding unsupported keywords: %s", invalid_tags)
+
+                response_data = dict(response_data)
+                valid_tags = [
+                    tag
+                    for tag in tags
+                    if isinstance(tag, str) and tag in valid_keywords
+                ]
+                response_data["tags"] = list(dict.fromkeys(valid_tags))[:max_keywords]
+
+            try:
+                return self.response_model.model_validate(response_data)
+            except ValidationError as exc:
+                if attempt < retry_limit:
+                    logger.info("LLM response did not match the schema; retrying")
+                    request = _request_with_correction(
+                        base_request,
+                        "Return one complete JSON object matching the schema. "
+                        f"Validation issues: {_validation_summary(exc)}",
+                    )
+                    continue
+
+                logger.warning(
+                    "LLM retry limit reached; reloading model before failing"
+                )
+                self.flush_model()
+                raise ValueError(
+                    f"Failed to validate LLM response after {retry_limit} retries: "
+                    f"{_validation_summary(exc)}"
+                ) from exc
 
     def _build_request(
         self,
@@ -118,6 +258,7 @@ class LlmSession:
         return LlmRequest(
             model=model_id,
             temperature=self.temperature,
+            max_tokens=settings.llm_max_completion_tokens,
             messages=[
                 # System prompt
                 LlmRequestMessage(
@@ -149,28 +290,59 @@ class LlmSession:
 
 class LlmSessionCaptionsAndKeywords(LlmSession):
     response_model = LlmResponseCaptionsAndKeywords
+    prompt = "Give me a caption and keywords for the following photo"
 
     def __init__(self, temperature: float = settings.llm_default_temperature):
         super().__init__(
             system_prompt=(
                 "You are a helpful photographer's assistant that helps to write **captions** and **keywords** to photos:\n"
                 "Answer in German.\n"
+                f"Choose at most {settings.llm_max_keywords} distinct, relevant keywords. "
+                "Do not repeat or enumerate the allowed-keyword list.\n"
                 "Output must be a JSON of the following schema:\n"
                 f"{self.response_model.model_json_schema()}"
             ),
             temperature=temperature,
         )
 
-    def call(self, photos: list[Photo], model_id=None):
-        return super().call(
-            prompt="Give me a caption and keyword for the following photo(s)",
-            photos=photos,
-            model_id=model_id,
+
+class LlmSessionCaption(LlmSession):
+    response_model = LlmResponseCaption
+    prompt = "Write a caption for the following photo"
+
+    def __init__(self, temperature: float = settings.llm_default_temperature):
+        super().__init__(
+            system_prompt=(
+                "You are a helpful photographer's assistant that writes captions "
+                "for photos. Answer in German.\n"
+                "Output must be a JSON of the following schema:\n"
+                f"{self.response_model.model_json_schema()}"
+            ),
+            temperature=temperature,
+        )
+
+
+class LlmSessionKeywords(LlmSession):
+    response_model = LlmResponseKeywords
+    prompt = "Choose appropriate keywords for the following photo"
+
+    def __init__(self, temperature: float = settings.llm_default_temperature):
+        super().__init__(
+            system_prompt=(
+                "You are a helpful photographer's assistant that chooses keywords "
+                "for photos. Answer in German.\n"
+                f"Choose at most {settings.llm_max_keywords} distinct, relevant keywords. "
+                "Do not repeat or enumerate the allowed-keyword list.\n"
+                "Output must be a JSON of the following schema:\n"
+                f"{self.response_model.model_json_schema()}"
+            ),
+            temperature=temperature,
         )
 
 
 class LlmSessionQuality(LlmSession):
     response_model = LlmResponseQuality
+    prompt = "Assess the quality of the following photos to help me decide which ones to sort out"
 
     def __init__(self, temperature: float = settings.llm_default_temperature):
         super().__init__(
@@ -182,10 +354,3 @@ class LlmSessionQuality(LlmSession):
             ),
             temperature=temperature,
         )
-
-    def call(self, photos: list[Photo], model_id=None):
-        return super().call(
-            prompt="Assess the quality of the following photos to help me decide which ones to sort out",
-            photos=photos,
-            model_id=model_id,
-        )

src/photools3/lm_studio.py

@@ -0,0 +1,135 @@
+import json
+import logging
+import time
+from urllib.error import HTTPError, URLError
+from urllib.parse import urlsplit, urlunsplit
+from urllib.request import Request, urlopen
+
+logger = logging.getLogger(__name__)
+
+_LOAD_CONFIG_KEYS = (
+    "context_length",
+    "eval_batch_size",
+    "flash_attention",
+    "num_experts",
+    "offload_kv_cache_to_gpu",
+)
+
+
+class LMStudioError(RuntimeError):
+    """Raised when LM Studio model management fails."""
+
+
+class LMStudioModelManager:
+    """Unload and reload a model through LM Studio's native REST API."""
+
+    def __init__(self, openai_base_url: str, api_key: str, timeout: float = 600):
+        parsed_url = urlsplit(openai_base_url)
+        path = parsed_url.path.rstrip("/")
+        path = path.removesuffix("/v1")
+        root_url = urlunsplit(
+            (parsed_url.scheme, parsed_url.netloc, path, "", "")
+        ).rstrip("/")
+        self.api_base_url = f"{root_url}/api/v1"
+        self.api_key = api_key
+        self.timeout = timeout
+
+    def reload_model(self, model_id: str) -> None:
+        """Unload the matching loaded instance and reload it with its config."""
+        started = time.perf_counter()
+        models_response = self._request("GET", "/models")
+        model, loaded_instance = self._find_model(models_response, model_id)
+        model_key = model["key"]
+
+        if loaded_instance is not None:
+            self._request(
+                "POST",
+                "/models/unload",
+                {"instance_id": loaded_instance["id"]},
+            )
+            load_config = loaded_instance.get("config", {})
+        else:
+            load_config = {}
+
+        load_body = {"model": model_key}
+        load_body.update(
+            {
+                key: load_config[key]
+                for key in _LOAD_CONFIG_KEYS
+                if key in load_config and load_config[key] is not None
+            }
+        )
+        self._request("POST", "/models/load", load_body)
+        logger.info(
+            "Reloaded LM Studio model %s in %.1f seconds",
+            model_key,
+            time.perf_counter() - started,
+        )
+
+    @staticmethod
+    def _find_model(models_response: dict, model_id: str) -> tuple[dict, dict | None]:
+        models = models_response.get("models")
+        if not isinstance(models, list):
+            raise LMStudioError("LM Studio model list response has no models array")
+
+        for model in models:
+            loaded_instances = model.get("loaded_instances", [])
+            for instance in loaded_instances:
+                if instance.get("id") == model_id:
+                    return model, instance
+
+        matching_models = [model for model in models if model.get("key") == model_id]
+        if len(matching_models) != 1:
+            raise LMStudioError(
+                f"Could not uniquely identify LM Studio model {model_id!r}"
+            )
+
+        model = matching_models[0]
+        loaded_instances = model.get("loaded_instances", [])
+        if len(loaded_instances) > 1:
+            raise LMStudioError(
+                f"Multiple loaded instances found for LM Studio model {model_id!r}"
+            )
+        loaded_instance = loaded_instances[0] if loaded_instances else None
+        return model, loaded_instance
+
+    def _request(self, method: str, path: str, body: dict | None = None) -> dict:
+        data = None if body is None else json.dumps(body).encode("utf-8")
+        headers = {"Accept": "application/json"}
+        if data is not None:
+            headers["Content-Type"] = "application/json"
+        if self.api_key:
+            headers["Authorization"] = f"Bearer {self.api_key}"
+
+        request = Request(
+            f"{self.api_base_url}{path}",
+            data=data,
+            headers=headers,
+            method=method,
+        )
+        try:
+            with urlopen(request, timeout=self.timeout) as response:
+                response_body = response.read()
+        except HTTPError as exc:
+            detail = exc.read().decode("utf-8", errors="replace")
+            raise LMStudioError(
+                f"LM Studio {method} {path} returned HTTP {exc.code}: {detail}"
+            ) from exc
+        except (URLError, TimeoutError) as exc:
+            raise LMStudioError(
+                f"Could not reach LM Studio at {self.api_base_url}: {exc}"
+            ) from exc
+
+        if not response_body:
+            return {}
+        try:
+            result = json.loads(response_body)
+        except json.JSONDecodeError as exc:
+            raise LMStudioError(
+                f"LM Studio {method} {path} returned invalid JSON"
+            ) from exc
+        if not isinstance(result, dict):
+            raise LMStudioError(
+                f"LM Studio {method} {path} returned an unexpected response"
+            )
+        return result

src/photools3/metadata_writer.py

@@ -0,0 +1,180 @@
+import logging
+import shutil
+from pathlib import Path
+from typing import Annotated, Any
+
+import exiftool
+from pydantic import StringConstraints
+
+from photools3.settings import settings
+
+log = logging.getLogger(__name__)
+
+_EXIFTOOL_MISSING_MSG = (
+    "exiftool binary not found in PATH. "
+    "Install the system package: 'perl-image-exiftool' (Arch) or 'libimage-exiftool-perl' (Debian/Ubuntu)."
+)
+if shutil.which("exiftool") is None:
+    raise FileNotFoundError(_EXIFTOOL_MISSING_MSG)
+
+XmpKey = Annotated[str, StringConstraints(pattern=r"^\w+\:\w+")]
+
+type Caption = str
+type Keywords = list[str]
+type Color = int
+type XmpMetadata = dict[str, Any]
+
+XMP_KEYS_CAPTION: list[XmpKey] = [
+    "XMP:Description",
+    "EXIF:ImageDescription",
+    "IPTC:Caption-Abstract",
+]
+
+XMP_KEYS_KEYWORDS: list[XmpKey] = [
+    "XMP:HierarchicalSubject",
+    "XMP:Subject",
+    "IPTC:Keywords",
+]
+
+
+def _prefixed(txt: str) -> str:
+    return f"{settings.metadata_prefix}{txt}"
+
+
+def _is_prefixed(txt: str) -> bool:
+    return txt.startswith(settings.metadata_prefix)
+
+
+def _separate_prefixed_caption(txt: str) -> tuple[str, str | None]:
+    separated = [x.strip() for x in txt.split(settings.metadata_prefix)]
+    return (separated[0], separated[1] if len(separated) > 1 else None)
+
+
+class MetadataWriter:
+    """
+    Write metadata (captions and keywords) to image files.
+    For DNG files, creates/updates XMP sidecar files.
+    """
+
+    def __init__(
+        self,
+        path: Path,
+        force_sidecar: bool = False,
+        append: bool = True,
+    ):
+        self.path: Path = path
+        self.force_sidecar: bool = force_sidecar
+        self.append: bool = append
+
+        self._metadata: XmpMetadata | None = None
+
+    @property
+    def sidecar_path(self) -> Path:
+        return Path(str(self.path) + ".xmp")
+
+    @property
+    def metadata(self) -> Any:
+        path = self.sidecar_path if self.sidecar_path.exists() else self.path
+        if not path.exists():
+            log.warning(f"File not found: {path}")
+            return None
+        try:
+            with exiftool.ExifToolHelper() as exif:
+                metadata = exif.get_metadata([path])[0]
+        except Exception as exc:  # noqa: BLE001
+            log.error(f"Could not read metadata from {path}: {exc}")
+            return None
+        return metadata
+
+    def get_caption(self) -> str:
+        result = (self.metadata or {}).get(XMP_KEYS_CAPTION[0], "")
+        assert isinstance(result, str)
+        return result
+
+    def get_keywords(self) -> list[str]:
+        result = (self.metadata or {}).get(XMP_KEYS_KEYWORDS[0], []) or []
+        if isinstance(result, str):
+            result = [result]
+        assert isinstance(result, list)
+        return result
+
+    def set_metadata(self, metadata_tags: dict[str, Any]):
+        try:
+            with exiftool.ExifToolHelper() as exif:
+                if not self.sidecar_path.exists():
+                    exif.execute("-o", str(self.sidecar_path), str(self.path))
+                exif.set_tags(
+                    [str(self.sidecar_path)],
+                    tags=metadata_tags,
+                    params=["-overwrite_original"],
+                )
+        except Exception as exc:
+            log.error(f"Could not write metadata to file {self.sidecar_path}: {exc}")
+            raise RuntimeError(
+                f"Could not write metadata to file {self.sidecar_path}"
+            ) from exc
+
+    def write_caption(
+        self, caption: Caption, include_prefix: bool = True, override: bool = True
+    ):
+        existing_no_prefix, existing_prefix = _separate_prefixed_caption(
+            self.get_caption()
+        )
+        if existing_no_prefix:
+            existing_no_prefix = (
+                f"{existing_no_prefix}."
+                if not existing_no_prefix.endswith(".")
+                else existing_no_prefix
+            )
+            existing_no_prefix = f"{existing_no_prefix} "
+
+        if include_prefix and existing_prefix and not override:
+            return
+        if not include_prefix and existing_no_prefix and not override:
+            return
+        if include_prefix:
+            caption = f"{existing_no_prefix}{_prefixed(caption)}"
+        metadata_tags = {key: caption for key in XMP_KEYS_CAPTION}
+        self.set_metadata(metadata_tags)
+
+    def write_keywords(self, keywords: Keywords, include_prefix: bool = True):
+        if include_prefix:
+            keywords = list(map(_prefixed, keywords))
+        existing = self.get_keywords()
+        keywords = list(set(existing + keywords))
+        metadata_tags = {tag: keywords for tag in XMP_KEYS_KEYWORDS}
+        self.set_metadata(metadata_tags)
+
+    def write_color(self, color: Color):
+        self.set_metadata({"XMP-darktable:Colorlabels": color})
+
+    def write(
+        self,
+        caption: Caption | None = None,
+        keywords: Keywords | None = None,
+        color: Color | None = None,
+    ):
+        metadata_tags: XmpMetadata = {}
+        if caption is not None:
+            existing_no_prefix, _ = _separate_prefixed_caption(self.get_caption())
+            if existing_no_prefix:
+                existing_no_prefix = (
+                    f"{existing_no_prefix}."
+                    if not existing_no_prefix.endswith(".")
+                    else existing_no_prefix
+                )
+                existing_no_prefix = f"{existing_no_prefix} "
+            caption = f"{existing_no_prefix}{_prefixed(caption)}"
+            metadata_tags.update({key: caption for key in XMP_KEYS_CAPTION})
+
+        if keywords is not None:
+            keywords = list(map(_prefixed, keywords))
+            existing = self.get_keywords()
+            keywords = list(set(existing + keywords))
+            metadata_tags.update({tag: keywords for tag in XMP_KEYS_KEYWORDS})
+
+        if color is not None:
+            metadata_tags["XMP-darktable:Colorlabels"] = color
+
+        if metadata_tags:
+            self.set_metadata(metadata_tags)

src/photools3/models.py

@@ -1,3 +1,4 @@
+import json
 from enum import StrEnum
 from functools import lru_cache
 from typing import Annotated, Any, Literal
@@ -10,7 +11,7 @@ from pydantic import (
     model_validator,
 )
 
-from .settings import KEYWORDS_LIST_PATH
+from .settings import KEYWORDS_LIST_PATH, settings
 
 
 @lru_cache
@@ -42,6 +43,7 @@ class LlmRequest(BaseModel):
     model: str = "gpt-4o"
     messages: list[LlmRequestMessage]
     temperature: float | None = None
+    max_tokens: int
 
 
 class LlmMessageRole(StrEnum):
@@ -86,7 +88,7 @@ class LlmResponseGeneral(BaseModel):
     text: str
 
 
-class LlmResponseCaptionsAndKeywords(BaseModel):
+class LlmResponseCaption(BaseModel):
     caption: Annotated[
         str,
         Field(
@@ -96,16 +98,24 @@ class LlmResponseCaptionsAndKeywords(BaseModel):
             )
         ),
     ]
-    tags: list[str] = Field(
-        description=(
-            "A list of keywords that properly tag the photo. "
-            "Allowed keywords: "
-            + str(load_valid_keywords())
-            .replace("'", '"')
-            .replace("{", "[")
-            .replace("}", "]")
-        )
+
+
+def _keyword_tags_field():
+    allowed_keywords = json.dumps(
+        sorted(load_valid_keywords()), ensure_ascii=False, separators=(",", ":")
     )
+    return Field(
+        max_length=settings.llm_max_keywords,
+        description=(
+            f"Choose at most {settings.llm_max_keywords} distinct, relevant keywords. "
+            "Do not enumerate the vocabulary. Allowed keywords: "
+            f"{allowed_keywords}"
+        ),
+    )
+
+
+class _LlmResponseWithTags(BaseModel):
+    tags: list[str] = _keyword_tags_field()
 
     @field_validator("tags")
     @classmethod
@@ -119,6 +129,22 @@ class LlmResponseCaptionsAndKeywords(BaseModel):
         return v
 
 
+class LlmResponseKeywords(_LlmResponseWithTags):
+    pass
+
+
+class LlmResponseCaptionsAndKeywords(_LlmResponseWithTags):
+    caption: Annotated[
+        str,
+        Field(
+            description=(
+                "A brief but precise description of what the picture shows. "
+                "No interpretation; just what is visible"
+            )
+        ),
+    ]
+
+
 class LlmResponseQuality(BaseModel):
     rating: Annotated[
         Literal["ok", "review", "not_ok"],

src/photools3/photo.py

@@ -1,6 +1,7 @@
 import base64
 from io import BytesIO
 from pathlib import Path
+from typing import Self
 
 from PIL import Image
 
@@ -17,6 +18,15 @@ class Photo:
         self.path = path
         self.image = Image.open(path)
 
+    def close(self):
+        self.image.close()
+
+    def __enter__(self) -> Self:
+        return self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        self.close()
+
     def resize(self, image_max_size=1024) -> Photo:
         """Limiting max dimensions while maintaining aspect ratio"""
         self.image.thumbnail((image_max_size, image_max_size), Image.Resampling.LANCZOS)
@@ -24,7 +34,9 @@ class Photo:
 
     def to_rgb(self):
         if self.image.mode != "RGB":
-            self.image = self.image.convert("RGB")
+            original = self.image
+            self.image = original.convert("RGB")
+            original.close()
         return self
 
     def get_encoded(self):

src/photools3/processing.py

@@ -0,0 +1,138 @@
+import logging
+import time
+from collections.abc import Iterable
+from dataclasses import dataclass
+from enum import StrEnum
+from pathlib import Path
+
+from photools3.llm_session import (
+    LlmSession,
+    LlmSessionCaption,
+    LlmSessionCaptionsAndKeywords,
+    LlmSessionKeywords,
+)
+from photools3.metadata_writer import MetadataWriter
+from photools3.models import (
+    LlmResponseCaption,
+    LlmResponseCaptionsAndKeywords,
+    LlmResponseKeywords,
+)
+from photools3.photo import Photo
+
+logger = logging.getLogger(__name__)
+
+type ProcessingResponse = (
+    LlmResponseCaption | LlmResponseKeywords | LlmResponseCaptionsAndKeywords
+)
+
+
+class ProcessingMode(StrEnum):
+    KEYWORDS = "keywords"
+    CAPTIONS = "captions"
+    BOTH = "both"
+
+
+@dataclass(frozen=True)
+class ProcessingOutcome:
+    path: Path
+    result: ProcessingResponse | None = None
+    error: str | None = None
+
+    @property
+    def succeeded(self) -> bool:
+        return self.error is None and self.result is not None
+
+
+def _create_session(mode: ProcessingMode) -> LlmSession:
+    if mode == ProcessingMode.KEYWORDS:
+        return LlmSessionKeywords()
+    if mode == ProcessingMode.CAPTIONS:
+        return LlmSessionCaption()
+    return LlmSessionCaptionsAndKeywords()
+
+
+def process_photo(
+    path: Path | str,
+    mode: ProcessingMode | str = ProcessingMode.BOTH,
+    *,
+    session: LlmSession | None = None,
+) -> ProcessingResponse:
+    """Process one photo and write the requested LLM result to its metadata.
+
+    If a session is supplied, its lifecycle remains the caller's responsibility.
+    """
+    path = Path(path)
+    mode = ProcessingMode(mode)
+    owns_session = session is None
+    active_session = session if session is not None else _create_session(mode)
+
+    logger.info(f"Processing photo: {path!s}")
+
+    try:
+        with Photo(path) as photo:
+            result = active_session.call([photo])
+
+        caption: str | None = None
+        keywords: list[str] | None = None
+        if mode == ProcessingMode.CAPTIONS:
+            if not isinstance(result, LlmResponseCaption):
+                raise TypeError("Caption mode returned an unexpected response type")
+            caption = result.caption
+        elif mode == ProcessingMode.KEYWORDS:
+            if not isinstance(result, LlmResponseKeywords):
+                raise TypeError("Keywords mode returned an unexpected response type")
+            keywords = result.tags
+        else:
+            if not isinstance(result, LlmResponseCaptionsAndKeywords):
+                raise TypeError("Both mode returned an unexpected response type")
+            caption = result.caption
+            keywords = result.tags
+
+        MetadataWriter(path).write(caption=caption, keywords=keywords)
+        return result
+    finally:
+        if owns_session:
+            active_session.close()
+
+
+def process_batch(
+    paths: Iterable[Path | str],
+    mode: ProcessingMode | str = ProcessingMode.BOTH,
+) -> list[ProcessingOutcome]:
+    """Process photos sequentially, reusing one LLM client for the whole batch.
+
+    A failed photo is recorded in its outcome and does not stop later photos.
+    Only one decoded image is held at a time.
+    """
+    mode = ProcessingMode(mode)
+    session = _create_session(mode)
+    outcomes: list[ProcessingOutcome] = []
+
+    try:
+        for item in paths:
+            path = Path(item)
+            photo_started = time.perf_counter()
+            try:
+                result = process_photo(path, mode, session=session)
+            except Exception as exc:
+                logger.exception("Failed to process %s", path)
+                # Keep only a string, not the exception/traceback, which can
+                # retain references to the just-processed image and stack.
+                outcomes.append(
+                    ProcessingOutcome(
+                        path=path,
+                        error=f"{type(exc).__name__}: {exc}",
+                    )
+                )
+            else:
+                outcomes.append(ProcessingOutcome(path=path, result=result))
+            finally:
+                logger.debug(
+                    "Photo processing for %s took %.2f seconds",
+                    path,
+                    time.perf_counter() - photo_started,
+                )
+    finally:
+        session.close()
+
+    return outcomes

src/photools3/settings.py

@@ -1,5 +1,6 @@
 from pathlib import Path
 
+from pydantic import Field
 from pydantic_core import Url
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
@@ -13,8 +14,18 @@ KEYWORDS_LIST_PATH = CONFIG_DIR / "keywords.txt"
 
 
 class Settings(BaseSettings):
-    model_config = SettingsConfigDict(env_file=".env")
+    model_config = SettingsConfigDict(env_file=".env", extra="ignore")
 
     llm_api_base_url: Url
     llm_api_key: str
     llm_default_temperature: float
+    llm_request_timeout_seconds: float = Field(default=10, gt=0)
+    llm_max_completion_tokens: int = Field(default=1024, gt=0)
+    llm_max_retries: int = Field(default=5, ge=0)
+    llm_max_keywords: int = Field(default=15, ge=1)
+    log_level: str = "INFO"
+
+    metadata_prefix: str
+
+
+settings = Settings()  # type: ignore[call-arg]

test/test_cli.py

@@ -1,100 +1,197 @@
-import logging
 from pathlib import Path
+from types import SimpleNamespace
 from unittest.mock import patch
 
-import pytest
 from typer.testing import CliRunner
 
 from photools3.cli import app
+from photools3.processing import ProcessingMode
 
 runner = CliRunner()
 
-CLI_LOGGER = "photools3.cli"
+
+def _success_outcome(path: Path):
+    return SimpleNamespace(path=path, succeeded=True, error=None)
 
 
-@pytest.fixture
-def mock_photo_logic(tmp_path):
-    """Fixture to mock the core logic of keywords command."""
+def test_metadata_magic_command_defaults_to_both_for_single_photo(tmp_path):
+    image_path = tmp_path / "photo.jpg"
+    image_path.write_bytes(b"test image")
+
     with (
-        patch("photools3.cli.LlmSessionCaptionsAndKeywords") as mocked_session,
-        patch("photools3.cli.Photo") as mocked_photo,
+        patch("photools3.cli.process_photo") as process_photo,
+        patch("photools3.cli.process_batch") as process_batch,
     ):
-
-        # Configure session mock
-        session_instance = mocked_session.return_value
-        session_instance.call.return_value = {
-            "caption": "A beautiful test image",
-            "args": ["test", "mock", "image"],  # Wait, the code uses 'tags'
-        }
-        # Let me re-check the code in cli.py
-        # result.get("tags", [])
-        session_instance.call.return_value = {
-            "caption": "A beautiful test image",
-            "tags": ["test", "mock", "image"],
-        }
-
-        # Configure photo mock
-        photo_instance = mocked_photo.return_value
-        photo_instance.path = tmp_path / "test_image.jpg"
-
-        yield {
-            "session": session_instance,
-            "photo_class": mocked_photo,
-            "photo_instance": photo_instance,
-        }
-
-
-@pytest.fixture
-def dummy_file(tmp_path):
-    """Fixture to create a dummy file for CLI testing."""
-    dummy_path = tmp_path / "test_image.jpg"
-    dummy_path.write_text("dummy content")
-    return dummy_path
-
-
-def test_keywords_command_success(mock_photo_logic, dummy_file, caplog):
-    """Test the 'keywords' command with a valid file path."""
-    # Ensure the mock photo instance points to our dummy file
-    mock_photo_logic["photo_class"].return_value.path = dummy_file
-
-    with caplog.at_level(logging.INFO, logger=CLI_LOGGER):
-        result = runner.invoke(app, ["keywords", str(dummy_file)])
+        result = runner.invoke(app, ["metadata-magic", str(image_path)])
 
     assert result.exit_code == 0
-    assert "Processing: " in caplog.text
-    # The result is logged as a raw dictionary string
-    assert (
-        "{'caption': 'A beautiful test image', 'tags': ['test', 'mock', 'image']}"
-        in caplog.text
+    process_photo.assert_called_once_with(image_path, ProcessingMode.BOTH)
+    process_batch.assert_not_called()
+
+
+def test_metadata_magic_command_selects_caption_mode(tmp_path):
+    image_path = tmp_path / "photo.jpg"
+    image_path.write_bytes(b"test image")
+
+    with patch("photools3.cli.process_photo") as process_photo:
+        result = runner.invoke(
+            app, ["metadata-magic", str(image_path), "--mode", "captions"]
+        )
+
+    assert result.exit_code == 0
+    process_photo.assert_called_once_with(image_path, ProcessingMode.CAPTIONS)
+
+
+def test_metadata_magic_command_batches_multiple_files(tmp_path):
+    paths = [tmp_path / "one.jpg", tmp_path / "two.jpg"]
+    for path in paths:
+        path.write_bytes(b"test image")
+
+    with (
+        patch("photools3.cli.process_photo") as process_photo,
+        patch("photools3.cli.process_batch") as process_batch,
+    ):
+        process_batch.return_value = [_success_outcome(path) for path in paths]
+        result = runner.invoke(
+            app,
+            ["metadata-magic", *(str(path) for path in paths), "--mode", "keywords"],
+        )
+
+    assert result.exit_code == 0
+    process_photo.assert_not_called()
+    process_batch.assert_called_once_with(paths, ProcessingMode.KEYWORDS)
+
+
+def test_metadata_magic_command_expands_directories_recursively(tmp_path):
+    root = tmp_path / "photos"
+    nested = root / "nested"
+    nested.mkdir(parents=True)
+    top_level_photo = root / "one.jpg"
+    nested_photo = nested / "two.png"
+    sidecar = root / "one.jpg.xmp"
+    for path in (top_level_photo, nested_photo, sidecar):
+        path.write_bytes(b"placeholder")
+
+    with (
+        patch("photools3.cli.process_photo") as process_photo,
+        patch("photools3.cli.process_batch") as process_batch,
+    ):
+        process_batch.return_value = [
+            _success_outcome(nested_photo),
+            _success_outcome(top_level_photo),
+        ]
+        result = runner.invoke(
+            app, ["metadata-magic", str(root), "--recursive", "--mode", "both"]
+        )
+
+    assert result.exit_code == 0
+    process_photo.assert_not_called()
+    process_batch.assert_called_once_with(
+        [nested_photo, top_level_photo], ProcessingMode.BOTH
     )
 
 
-def test_keywords_command_file_not_found(caplog):
-    """Test the 'keywords' command with a non-existent file path."""
-    non_existent_file = Path("non_existent_file.jpg")
+def test_metadata_magic_command_does_not_recurse_by_default(tmp_path):
+    root = tmp_path / "photos"
+    nested = root / "nested"
+    nested.mkdir(parents=True)
+    top_level_photo = root / "one.jpg"
+    nested_photo = nested / "two.jpg"
+    top_level_photo.write_bytes(b"placeholder")
+    nested_photo.write_bytes(b"placeholder")
 
-    with caplog.at_level(logging.ERROR, logger=CLI_LOGGER):
-        result = runner.invoke(app, ["keywords", str(non_existent_file)])
+    with (
+        patch("photools3.cli.process_photo") as process_photo,
+        patch("photools3.cli.process_batch") as process_batch,
+    ):
+        result = runner.invoke(app, ["metadata-magic", str(root)])
+
+    assert result.exit_code == 0
+    process_photo.assert_called_once_with(top_level_photo, ProcessingMode.BOTH)
+    process_batch.assert_not_called()
+
+
+def test_metadata_magic_command_returns_failure_if_any_batch_item_fails(tmp_path):
+    paths = [tmp_path / "one.jpg", tmp_path / "two.jpg"]
+    for path in paths:
+        path.write_bytes(b"test image")
+
+    with patch("photools3.cli.process_batch") as process_batch:
+        process_batch.return_value = [
+            _success_outcome(paths[0]),
+            SimpleNamespace(
+                path=paths[1], succeeded=False, error="RuntimeError: write failed"
+            ),
+        ]
+        result = runner.invoke(app, ["metadata-magic", *(str(path) for path in paths)])
 
     assert result.exit_code == 1
-    assert f"Error: File '{non_existent_file}' does not exist." in caplog.text
 
 
-def test_keywords_command_error_during_processing(mock_photo_logic, dummy_file):
-    """Test the 'keywords' command when an exception occurs during processing."""
-    # Configure the session mock to raise an exception
-    mock_photo_logic["session"].call.side_effect = Exception("LLM error")
+def test_metadata_magic_command_returns_failure_for_single_photo_error(tmp_path):
+    image_path = tmp_path / "photo.jpg"
+    image_path.write_bytes(b"test image")
 
-    result = runner.invoke(app, ["keywords", str(dummy_file)])
+    with patch("photools3.cli.process_photo", side_effect=RuntimeError("LLM error")):
+        result = runner.invoke(app, ["metadata-magic", str(image_path)])
+
+    assert result.exit_code == 1
+
+
+def test_keywords_alias_is_not_registered():
+    result = runner.invoke(app, ["keywords", "photo.jpg"])
+
+    assert result.exit_code == 2
+    assert "No such command 'keywords'" in result.output
+
+
+def test_old_process_command_name_is_not_registered():
+    result = runner.invoke(app, ["process", "photo.jpg"])
+
+    assert result.exit_code == 2
+    assert "No such command 'process'" in result.output
+
+
+def test_metadata_magic_command_rejects_empty_directory(tmp_path):
+    with (
+        patch("photools3.cli.process_photo") as process_photo,
+        patch("photools3.cli.process_batch") as process_batch,
+    ):
+        result = runner.invoke(app, ["metadata-magic", str(tmp_path)])
+
+    assert result.exit_code == 1
+    process_photo.assert_not_called()
+    process_batch.assert_not_called()
+
+
+def test_quality_command_closes_photo_and_session(tmp_path):
+    image_path = tmp_path / "photo.jpg"
+    image_path.write_bytes(b"test image")
+
+    with (
+        patch("photools3.cli.LlmSessionQuality") as session_class,
+        patch("photools3.cli.Photo") as photo_class,
+    ):
+        result = runner.invoke(app, ["quality", str(image_path)])
+
+    assert result.exit_code == 0
+    session_class.return_value.__enter__.return_value.call.assert_called_once_with(
+        [photo_class.return_value.__enter__.return_value]
+    )
+    session_class.return_value.__exit__.assert_called_once()
+    photo_class.return_value.__exit__.assert_called_once()
+
+
+def test_quality_command_reports_error_and_exits(tmp_path):
+    image_path = tmp_path / "photo.jpg"
+
+    with patch("photools3.cli.Photo", side_effect=FileNotFoundError(image_path)):
+        result = runner.invoke(app, ["quality", str(image_path)])
 
-    # Note: cli.py raises typer.Exit(code=1) before logging the
-    # "Error processing image: ..." message (the logger.error call is dead
-    # code after the raise), so only the exit code can be asserted here.
     assert result.exit_code == 1
 
 
 def test_version_command():
-    """Test the --version option."""
     result = runner.invoke(app, ["--version"])
 
     assert result.exit_code == 0

test/test_llm_session_mocked.py

@@ -1,6 +1,10 @@
 from unittest.mock import MagicMock, patch
 
-from photools3.llm_session import LlmSession
+import openai
+import pytest
+
+from photools3.llm_session import LlmSession, LlmSessionCaptionsAndKeywords
+from photools3.models import LlmResponseCaptionsAndKeywords
 
 
 def test_llm_session_mocked(test_photo):
@@ -84,3 +88,216 @@ def test_llm_session_captions_and_keywords_mocked(test_photo):
 
         # Verify that the mock was called
         assert mock_client.chat.completions.create.called
+
+
+def test_llm_session_retries_from_original_request_without_accumulating_messages():
+    with patch("photools3.llm_session.OpenAI") as mocked_openai:
+        mock_client = MagicMock()
+        mocked_openai.return_value = mock_client
+        mock_model = MagicMock()
+        mock_model.id = "gpt-4o"
+        mock_client.models.list.return_value.data = [mock_model]
+
+        def response(content):
+            message = MagicMock()
+            message.content = content
+            choice = MagicMock()
+            choice.message = message
+            result = MagicMock()
+            result.choices = [choice]
+            return result
+
+        mock_client.chat.completions.create.side_effect = [
+            response('{"wrong": "first"}'),
+            response('{"wrong": "second"}'),
+            response('{"text": "correct"}'),
+        ]
+
+        session = LlmSession(system_prompt="You are a helper.")
+        result = session.call(photos=[], prompt="Return JSON")
+
+    assert result.text == "correct"
+    requests = mock_client.chat.completions.create.call_args_list
+    messages_per_attempt = [call.kwargs["messages"] for call in requests]
+    assert [len(messages) for messages in messages_per_attempt] == [2, 3, 3]
+    final_correction = messages_per_attempt[2][-1]["content"]
+    assert "Field required" in final_correction
+    assert '"wrong"' not in final_correction
+
+
+def test_llm_session_uses_configured_retry_count(monkeypatch):
+    monkeypatch.setattr("photools3.llm_session.settings.llm_max_retries", 1)
+
+    with patch("photools3.llm_session.OpenAI") as mocked_openai:
+        mock_client = MagicMock()
+        mocked_openai.return_value = mock_client
+        mock_model = MagicMock()
+        mock_model.id = "gpt-4o"
+        mock_client.models.list.return_value.data = [mock_model]
+
+        def response(content):
+            message = MagicMock()
+            message.content = content
+            choice = MagicMock()
+            choice.message = message
+            result = MagicMock()
+            result.choices = [choice]
+            return result
+
+        mock_client.chat.completions.create.side_effect = [
+            response('{"wrong": "first"}'),
+            response('{"wrong": "second"}'),
+            response('{"text": "would be a third call"}'),
+        ]
+        session = LlmSession(system_prompt="You are a helper.")
+
+        with (
+            patch.object(session, "flush_model") as flush_model,
+            pytest.raises(ValueError, match="after 1 retries"),
+        ):
+            session.call(photos=[])
+
+    assert mock_client.chat.completions.create.call_count == 2
+    flush_model.assert_called_once()
+
+
+def test_llm_session_reloads_after_timeout_and_retries(monkeypatch):
+    monkeypatch.setattr(
+        "photools3.llm_session.settings.llm_request_timeout_seconds", 10
+    )
+    monkeypatch.setattr("photools3.llm_session.settings.llm_max_completion_tokens", 768)
+    monkeypatch.setattr("photools3.llm_session.settings.llm_max_retries", 1)
+
+    with patch("photools3.llm_session.OpenAI") as mocked_openai:
+        mock_client = MagicMock()
+        mocked_openai.return_value = mock_client
+        mock_model = MagicMock()
+        mock_model.id = "gpt-4o"
+        mock_client.models.list.return_value.data = [mock_model]
+
+        response_message = MagicMock(content='{"text": "recovered"}')
+        response_choice = MagicMock(message=response_message)
+        success_response = MagicMock(choices=[response_choice])
+        mock_client.chat.completions.create.side_effect = [
+            openai.APITimeoutError(request=MagicMock()),
+            success_response,
+        ]
+
+        session = LlmSession(system_prompt="You are a helper.")
+        with patch.object(session, "flush_model") as flush_model:
+            result = session.call(photos=[])
+
+    assert result.text == "recovered"
+    flush_model.assert_called_once()
+    calls = mock_client.chat.completions.create.call_args_list
+    assert len(calls) == 2
+    assert all(call.kwargs["timeout"] == 10 for call in calls)
+    assert all(call.kwargs["max_tokens"] == 768 for call in calls)
+    mocked_openai.assert_called_once_with(
+        base_url=session.base_url,
+        api_key=session.api_key,
+        max_retries=0,
+    )
+
+
+@pytest.mark.parametrize("failure_kind", ["invalid_response", "timeout"])
+def test_llm_session_reloads_when_retry_limit_is_exhausted(monkeypatch, failure_kind):
+    monkeypatch.setattr("photools3.llm_session.settings.llm_max_retries", 0)
+
+    with patch("photools3.llm_session.OpenAI") as mocked_openai:
+        mock_client = MagicMock()
+        mocked_openai.return_value = mock_client
+        mock_model = MagicMock()
+        mock_model.id = "gpt-4o"
+        mock_client.models.list.return_value.data = [mock_model]
+
+        if failure_kind == "timeout":
+            mock_client.chat.completions.create.side_effect = openai.APITimeoutError(
+                request=MagicMock()
+            )
+        else:
+            response_message = MagicMock(content='{"wrong": "shape"}')
+            response_choice = MagicMock(message=response_message)
+            mock_client.chat.completions.create.return_value = MagicMock(
+                choices=[response_choice]
+            )
+
+        session = LlmSession(system_prompt="You are a helper.")
+        with (
+            patch.object(session, "flush_model") as flush_model,
+            pytest.raises(ValueError),
+        ):
+            session.call(photos=[])
+
+    flush_model.assert_called_once()
+    assert mock_client.chat.completions.create.call_count == 1
+
+
+def test_invalid_keywords_get_one_correction_then_invalid_tags_are_dropped(monkeypatch):
+    monkeypatch.setattr("photools3.llm_session.settings.llm_max_keywords", 3)
+    monkeypatch.setattr("photools3.llm_session.settings.llm_max_retries", 5)
+
+    with patch("photools3.llm_session.OpenAI") as mocked_openai:
+        mock_client = MagicMock()
+        mocked_openai.return_value = mock_client
+        mock_model = MagicMock()
+        mock_model.id = "gpt-4o"
+        mock_client.models.list.return_value.data = [mock_model]
+
+        def response(content):
+            message = MagicMock(content=content)
+            choice = MagicMock(message=message)
+            return MagicMock(choices=[choice])
+
+        mock_client.chat.completions.create.side_effect = [
+            response(
+                '{"caption": "A caption", "tags": ["not_allowed", "architektur"]}'
+            ),
+            response(
+                '{"caption": "A caption", '
+                '"tags": ["still_invalid", "architektur", "personen"]}'
+            ),
+        ]
+        session = LlmSessionCaptionsAndKeywords()
+        with patch.object(session, "flush_model") as flush_model:
+            result = session.call(photos=[])
+
+    assert result.tags == ["architektur", "personen"]
+    assert mock_client.chat.completions.create.call_count == 2
+    flush_model.assert_not_called()
+    correction = mock_client.chat.completions.create.call_args_list[1].kwargs[
+        "messages"
+    ][-1]["content"]
+    assert "not_allowed" in correction
+    assert '"caption"' not in correction
+
+
+def test_excess_keywords_are_truncated_to_configured_limit(monkeypatch):
+    monkeypatch.setattr("photools3.llm_session.settings.llm_max_keywords", 2)
+
+    with patch("photools3.llm_session.OpenAI") as mocked_openai:
+        mock_client = MagicMock()
+        mocked_openai.return_value = mock_client
+        mock_model = MagicMock()
+        mock_model.id = "gpt-4o"
+        mock_client.models.list.return_value.data = [mock_model]
+        message = MagicMock(
+            content=(
+                '{"caption": "A caption", '
+                '"tags": ["architektur", "personen", "landschaft"]}'
+            )
+        )
+        mock_client.chat.completions.create.return_value = MagicMock(
+            choices=[MagicMock(message=message)]
+        )
+
+        result = LlmSessionCaptionsAndKeywords().call(photos=[])
+
+    assert result.tags == ["architektur", "personen"]
+    assert mock_client.chat.completions.create.call_count == 1
+
+
+def test_keyword_response_schema_includes_configured_max_items():
+    schema = LlmResponseCaptionsAndKeywords.model_json_schema()
+
+    assert schema["properties"]["tags"]["maxItems"] == 15

test/test_lm_studio.py

@@ -0,0 +1,102 @@
+import json
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+from photools3.lm_studio import LMStudioError, LMStudioModelManager
+
+
+def _http_response(payload: dict):
+    response = MagicMock()
+    response.__enter__.return_value = response
+    response.read.return_value = json.dumps(payload).encode("utf-8")
+    return response
+
+
+def test_reload_model_unloads_and_reloads_preserving_context_config():
+    model_response = {
+        "models": [
+            {
+                "key": "qwen/qwen3-vl-4b",
+                "loaded_instances": [
+                    {
+                        "id": "qwen/qwen3-vl-4b-instance",
+                        "config": {
+                            "context_length": 16384,
+                            "eval_batch_size": 256,
+                            "flash_attention": True,
+                            "offload_kv_cache_to_gpu": False,
+                            "parallel": 2,
+                        },
+                    }
+                ],
+            }
+        ]
+    }
+    with patch(
+        "photools3.lm_studio.urlopen",
+        side_effect=[
+            _http_response(model_response),
+            _http_response({"instance_id": "qwen/qwen3-vl-4b-instance"}),
+            _http_response({"instance_id": "qwen/qwen3-vl-4b-instance"}),
+        ],
+    ) as mocked_urlopen:
+        manager = LMStudioModelManager(
+            "http://localhost:1234/v1", "test-token", timeout=12
+        )
+        manager.reload_model("qwen/qwen3-vl-4b")
+
+    requests = [call.args[0] for call in mocked_urlopen.call_args_list]
+    assert requests[0].full_url == "http://localhost:1234/api/v1/models"
+    assert requests[0].get_method() == "GET"
+    assert requests[0].get_header("Authorization") == "Bearer test-token"
+
+    assert requests[1].full_url.endswith("/models/unload")
+    assert json.loads(requests[1].data) == {"instance_id": "qwen/qwen3-vl-4b-instance"}
+
+    assert requests[2].full_url.endswith("/models/load")
+    assert json.loads(requests[2].data) == {
+        "model": "qwen/qwen3-vl-4b",
+        "context_length": 16384,
+        "eval_batch_size": 256,
+        "flash_attention": True,
+        "offload_kv_cache_to_gpu": False,
+    }
+
+
+def test_reload_model_loads_by_key_if_no_instance_is_loaded():
+    model_response = {"models": [{"key": "qwen/model", "loaded_instances": []}]}
+    with patch(
+        "photools3.lm_studio.urlopen",
+        side_effect=[
+            _http_response(model_response),
+            _http_response({"status": "loaded"}),
+        ],
+    ) as mocked_urlopen:
+        manager = LMStudioModelManager("http://localhost:1234/v1", "token")
+        manager.reload_model("qwen/model")
+
+    assert mocked_urlopen.call_count == 2
+    load_request = mocked_urlopen.call_args.args[0]
+    assert load_request.full_url.endswith("/models/load")
+    assert json.loads(load_request.data) == {"model": "qwen/model"}
+
+
+def test_reload_model_rejects_ambiguous_model_selection():
+    model_response = {
+        "models": [
+            {
+                "key": "qwen/model",
+                "loaded_instances": [
+                    {"id": "instance-1", "config": {}},
+                    {"id": "instance-2", "config": {}},
+                ],
+            }
+        ]
+    }
+    with patch(
+        "photools3.lm_studio.urlopen", return_value=_http_response(model_response)
+    ):
+        manager = LMStudioModelManager("http://localhost:1234/v1", "token")
+        with pytest.raises(LMStudioError, match="Multiple loaded instances"):
+            manager.reload_model("qwen/model")

test/test_metadata_writer.py

@@ -0,0 +1,243 @@
+import shutil
+from pathlib import Path
+from unittest.mock import patch
+
+import pytest
+
+from photools3.metadata_writer import (
+    MetadataWriter,
+    _is_prefixed,
+    _prefixed,
+)
+from photools3.settings import settings
+from test.test_photo import PATHS_DNG_EXAMPLES
+
+PREFIX = settings.metadata_prefix
+
+
+@pytest.fixture
+def make_dng_file(tmp_path):
+    def _make(src: Path) -> Path:
+        dst = tmp_path / f"copy_{src.name}"
+        shutil.copy(src, dst)
+        return dst
+
+    return _make
+
+
+@pytest.fixture
+def metadata_writer_on_existing(make_dng_file):
+    metadata_writer = MetadataWriter(make_dng_file(PATHS_DNG_EXAMPLES[0]))
+    metadata_writer.write_caption(
+        "Let's pretend this is the caption of the original image",
+        include_prefix=False,
+    )
+    return metadata_writer
+
+
+@pytest.mark.parametrize("pic", PATHS_DNG_EXAMPLES)
+def test_read_metadata(make_dng_file, pic):
+    """primitive test for `MetadataWriter`"""
+    file_path = make_dng_file(pic)
+    result = MetadataWriter(file_path)
+    assert result
+    assert result.metadata
+    assert isinstance(result.metadata, dict)
+
+
+@pytest.mark.parametrize(
+    "pic, expected_keywords",
+    [
+        (PATHS_DNG_EXAMPLES[0], ["architektur", "zeit|abend"]),
+        (PATHS_DNG_EXAMPLES[1], ["architektur"]),
+        (PATHS_DNG_EXAMPLES[2], ["morgen", "tiere|vögel"]),
+        (
+            PATHS_DNG_EXAMPLES[3],
+            [
+                "abend",
+                "architektur",
+                "bewegungsunschärfe",
+                "lichter",
+                "mainz",
+                "spiegelung",
+                "wasser",
+            ],
+        ),
+        (
+            PATHS_DNG_EXAMPLES[4],
+            ["grau", "landschaft", "landschaft|weinberge", "personen", "tiefe", "weg"],
+        ),
+    ],
+)
+def test_get_keywords(make_dng_file, pic, expected_keywords):
+    path = make_dng_file(pic)
+    result = MetadataWriter(path).get_keywords()
+    assert sorted(result) == sorted(expected_keywords)
+
+
+def test_prefixed():
+    txt = "bla_bla"
+    txt_prefixed = _prefixed(txt)
+    assert txt_prefixed == f"{PREFIX}bla_bla"
+
+
+@pytest.mark.parametrize(
+    "txt, expected_result",
+    [
+        (f"{PREFIX}some text", True),
+        ("prefix is missing here", False),
+        ("some_perfix|but not the right one", False),
+    ],
+)
+def test_is_prefixed(txt, expected_result):
+    assert _is_prefixed(txt) == expected_result
+
+
+@pytest.mark.parametrize("pic", PATHS_DNG_EXAMPLES)
+def test_read_metadata_sidecar_path(make_dng_file, pic):
+    file_path = make_dng_file(pic)
+    metadata_writer = MetadataWriter(file_path)
+    assert isinstance(metadata_writer.sidecar_path, Path)
+    assert str(metadata_writer.sidecar_path).lower().endswith(".dng.xmp")
+
+    # file does not exits yet, only the name
+    assert not metadata_writer.sidecar_path.exists()
+
+
+@pytest.mark.parametrize("pic", PATHS_DNG_EXAMPLES)
+def test_set_caption(make_dng_file, pic):
+    metadata_writer = MetadataWriter(make_dng_file(pic))
+    assert not metadata_writer.sidecar_path.exists()  # sidecar does not exist yet ...
+    metadata_writer.write_caption("This is a test")
+    assert metadata_writer.sidecar_path.exists()  # ... but now!
+    result = metadata_writer.get_caption()
+    assert result
+    assert result == f"{PREFIX}This is a test"
+
+
+def test_set_caption_on_existing(metadata_writer_on_existing):
+    assert (
+        metadata_writer_on_existing.get_caption()
+        == "Let's pretend this is the caption of the original image"
+    )
+
+    metadata_writer_on_existing.write_caption("Another caption")
+    assert (
+        metadata_writer_on_existing.get_caption()
+        == f"Let's pretend this is the caption of the original image. {PREFIX}Another caption"
+    )
+
+    metadata_writer_on_existing.write_caption("Updated caption")
+    assert (
+        metadata_writer_on_existing.get_caption()
+        == f"Let's pretend this is the caption of the original image. {PREFIX}Updated caption"
+    )
+
+    metadata_writer_on_existing.write_caption("Don't do this!", override=False)
+    assert (
+        metadata_writer_on_existing.get_caption()
+        == f"Let's pretend this is the caption of the original image. {PREFIX}Updated caption"
+    )
+
+
+@pytest.mark.parametrize(
+    "pic, expected_keywords",
+    [
+        (
+            PATHS_DNG_EXAMPLES[0],
+            [
+                "architektur",
+                "zeit|abend",
+                f"{PREFIX}hund",
+                f"{PREFIX}katze",
+                f"{PREFIX}maus",
+            ],
+        ),
+        (
+            PATHS_DNG_EXAMPLES[1],
+            ["architektur", f"{PREFIX}hund", f"{PREFIX}katze", f"{PREFIX}maus"],
+        ),
+        (
+            PATHS_DNG_EXAMPLES[2],
+            [
+                "morgen",
+                "tiere|vögel",
+                f"{PREFIX}hund",
+                f"{PREFIX}katze",
+                f"{PREFIX}maus",
+            ],
+        ),
+        (
+            PATHS_DNG_EXAMPLES[3],
+            [
+                "abend",
+                "architektur",
+                "bewegungsunschärfe",
+                "lichter",
+                "mainz",
+                "spiegelung",
+                "wasser",
+                f"{PREFIX}hund",
+                f"{PREFIX}katze",
+                f"{PREFIX}maus",
+            ],
+        ),
+        (
+            PATHS_DNG_EXAMPLES[4],
+            [
+                "grau",
+                "landschaft",
+                "landschaft|weinberge",
+                "personen",
+                "tiefe",
+                "weg",
+                f"{PREFIX}hund",
+                f"{PREFIX}katze",
+                f"{PREFIX}maus",
+            ],
+        ),
+    ],
+)
+def test_set_keywords(make_dng_file, pic, expected_keywords):
+    metadata_writer = MetadataWriter(make_dng_file(pic))
+    metadata_writer.write_keywords(["hund", "katze", "maus"])
+    result = metadata_writer.get_keywords()
+    assert result
+    assert isinstance(result, list)
+    assert f"{PREFIX}hund" in result
+    assert f"{PREFIX}katze" in result
+    assert f"{PREFIX}maus" in result
+
+
+def test_set_keywords_on_existing():
+    # TODO
+    ...
+
+
+def test_write_caption_and_keywords_in_one_metadata_update(tmp_path):
+    writer = MetadataWriter(tmp_path / "photo.jpg")
+    with (
+        patch.object(writer, "get_caption", return_value="Original caption"),
+        patch.object(writer, "get_keywords", return_value=["existing"]),
+        patch.object(writer, "set_metadata") as set_metadata,
+    ):
+        writer.write(caption="Generated caption", keywords=["architektur"])
+
+    set_metadata.assert_called_once()
+    metadata_tags = set_metadata.call_args.args[0]
+    assert metadata_tags["XMP:Description"] == (
+        f"Original caption. {PREFIX}Generated caption"
+    )
+    assert set(metadata_tags["XMP:Subject"]) == {
+        "existing",
+        f"{PREFIX}architektur",
+    }
+
+
+def test_set_metadata_surfaces_write_failures(tmp_path):
+    writer = MetadataWriter(tmp_path / "photo.jpg")
+    with patch("photools3.metadata_writer.exiftool.ExifToolHelper") as exif:
+        exif_instance = exif.return_value.__enter__.return_value
+        exif_instance.execute.side_effect = OSError("ExifTool failed")
+        with pytest.raises(RuntimeError, match="Could not write metadata"):
+            writer.set_metadata({"XMP:Description": "caption"})

test/test_photo.py

@@ -48,6 +48,15 @@ def test_load_photo():
     assert isinstance(photo.image, Image.Image)
 
 
+def test_photo_context_manager_closes_image(tmp_path):
+    path = _make_image_file(tmp_path, "RGB")
+    with Photo(path) as photo:
+        image = photo.image
+        assert image.fp is not None
+
+    assert image.fp is None
+
+
 def test_resize_method_exists():
     """Test that resize method exists and returns a Photo instance"""
     photo = Photo(PATHS_DNG_EXAMPLES[0])

test/test_processing.py

@@ -0,0 +1,129 @@
+from pathlib import Path
+from unittest.mock import MagicMock, patch
+
+import pytest
+from PIL import Image
+
+from photools3.models import (
+    LlmResponseCaption,
+    LlmResponseCaptionsAndKeywords,
+    LlmResponseKeywords,
+)
+from photools3.processing import (
+    ProcessingMode,
+    _create_session,
+    process_batch,
+    process_photo,
+)
+
+
+@pytest.fixture
+def image_path(tmp_path):
+    path = tmp_path / "photo.png"
+    Image.new("RGB", (20, 20)).save(path)
+    return path
+
+
+@pytest.mark.parametrize(
+    ("mode", "response", "expected_metadata"),
+    [
+        (
+            ProcessingMode.KEYWORDS,
+            LlmResponseKeywords(tags=["architektur"]),
+            {"caption": None, "keywords": ["architektur"]},
+        ),
+        (
+            ProcessingMode.CAPTIONS,
+            LlmResponseCaption(caption="Ein Haus"),
+            {"caption": "Ein Haus", "keywords": None},
+        ),
+        (
+            ProcessingMode.BOTH,
+            LlmResponseCaptionsAndKeywords(caption="Ein Haus", tags=["architektur"]),
+            {"caption": "Ein Haus", "keywords": ["architektur"]},
+        ),
+    ],
+)
+def test_process_photo_writes_only_requested_metadata(
+    image_path, mode, response, expected_metadata
+):
+    session = MagicMock()
+    session.call.return_value = response
+
+    with (
+        patch("photools3.processing._create_session", return_value=session),
+        patch("photools3.processing.MetadataWriter") as writer_class,
+    ):
+        result = process_photo(image_path, mode)
+
+    assert result == response
+    session.call.assert_called_once()
+    session.close.assert_called_once()
+    writer_class.assert_called_once_with(image_path)
+    writer_class.return_value.write.assert_called_once_with(**expected_metadata)
+
+
+def test_process_photo_does_not_close_a_caller_owned_session(image_path):
+    session = MagicMock()
+    session.call.return_value = LlmResponseCaption(caption="Ein Haus")
+
+    with patch("photools3.processing.MetadataWriter"):
+        process_photo(image_path, ProcessingMode.CAPTIONS, session=session)
+
+    session.close.assert_not_called()
+
+
+@pytest.mark.parametrize(
+    ("mode", "constructor"),
+    [
+        (ProcessingMode.KEYWORDS, "LlmSessionKeywords"),
+        (ProcessingMode.CAPTIONS, "LlmSessionCaption"),
+        (ProcessingMode.BOTH, "LlmSessionCaptionsAndKeywords"),
+    ],
+)
+def test_create_session_selects_mode_specific_response_model(mode, constructor):
+    with patch(f"photools3.processing.{constructor}") as session_class:
+        assert _create_session(mode) is session_class.return_value
+
+    session_class.assert_called_once_with()
+
+
+def test_process_batch_is_sequential_reuses_session_and_continues_after_error():
+    active_photos = 0
+    max_active_photos = 0
+
+    class TrackingPhoto:
+        def __init__(self, path):
+            self.path = path
+
+        def __enter__(self):
+            nonlocal active_photos, max_active_photos
+            active_photos += 1
+            max_active_photos = max(max_active_photos, active_photos)
+            return self
+
+        def __exit__(self, exc_type, exc_value, traceback):
+            nonlocal active_photos
+            active_photos -= 1
+
+    session = MagicMock()
+    response = LlmResponseCaptionsAndKeywords(caption="Ein Haus", tags=["architektur"])
+    session.call.side_effect = [response, RuntimeError("temporary error"), response]
+    paths = [Path("one.jpg"), Path("two.jpg"), Path("three.jpg")]
+
+    with (
+        patch("photools3.processing._create_session", return_value=session),
+        patch("photools3.processing.Photo", TrackingPhoto),
+        patch("photools3.processing.MetadataWriter") as writer_class,
+    ):
+        outcomes = process_batch(paths, ProcessingMode.BOTH)
+
+    assert [outcome.succeeded for outcome in outcomes] == [True, False, True]
+    assert [outcome.path for outcome in outcomes] == paths
+    assert outcomes[1].error == "RuntimeError: temporary error"
+    assert max_active_photos == 1
+    assert active_photos == 0
+    assert session.call.call_count == 3
+    assert all(len(call.args[0]) == 1 for call in session.call.call_args_list)
+    assert writer_class.return_value.write.call_count == 2
+    session.close.assert_called_once()

test/test_settings.py

@@ -6,11 +6,9 @@ from photools3.settings import (
     PHOTOOLS3_DIR,
     ROOT_DIR,
     SRC_DIR,
-    Settings,
+    settings,
 )
 
-settings = Settings()
-
 
 def test_photools3_dir():
     assert PHOTOOLS3_DIR == Path(__file__).parent.parent.resolve() / "src" / "photools3"

uv.lock

@@ -1,6 +1,10 @@
 version = 1
-revision = 3
+revision = 5
 requires-python = ">=3.14"
+resolution-markers = [
+    "python_full_version >= '3.15'",
+    "python_full_version < '3.15'",
+]
 
 [[package]]
 name = "annotated-doc"
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 ]
 
+[[package]]
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