feat: add read_text tool — extract text from PDF/TXT/MD (v0.4.0)

Adds read_text tool with pypdf integration for PDF text extraction,
plain-text decode for TXT/MD/CSV/JSON/etc, page-filter support,
max_chars truncation, and 11 mock-based tests.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -14,18 +14,37 @@ Sibling project to `mcp-synology-container`.
 - **Credentials:** OS keyring, service name `mcp-synology-filestation`
 - **Gitea:** `https://gitea.gecheckt.de/marcus/mcp-synology-filestation`
 - **Local code:** `D:\Dev\Projects\mcp-synology-filestation`
-- **Runtime:** Python 3.12+, `uv`, MCP SDK, `httpx`, `keyring`, `click`, `rich`
+- **Runtime:** Python 3.12+, `uv`, MCP SDK (`mcp>=1.0.0`), `httpx`, `keyring`, `click`, `rich`
+- **Test share on NAS:** `/test-mcp` — only for MCP tests, no production data
+- **DSM test user:** `Testuser` / `Lasdas1234` (read-only, for browser tests)
 
 ## Deploy Workflow
 
 1. Commit and push via Claude Code.
-2. `uv tool install --reinstall git+https://gitea.gecheckt.de/marcus/mcp-synology-filestation.git`
-3. Restart Claude Desktop.
+2. **Close Claude Desktop first** (Windows holds file locks — reinstall fails otherwise).
+3. Install:
+   ```
+   uv tool install --reinstall dist\mcp_synology_filestation-X.Y.Z-py3-none-any.whl
+   ```
+   Or directly from Gitea:
+   ```
+   uv tool install --reinstall git+https://gitea.gecheckt.de/marcus/mcp-synology-filestation.git
+   ```
+4. Restart Claude Desktop.
+5. Verify: `uv tool list` shows the expected version.
+
+## Versioning
+
+Bump the patch version on **every commit** in **both** files:
+- `pyproject.toml` → `version = "X.Y.Z"`
+- `src/mcp_synology_filestation/__init__.py` → `__version__ = "X.Y.Z"`
+
+Current series: `0.3.x`
 
 ## Toolchain
 
 | Task        | Command                                   |
-|------|---------|
+|-------------|-------------------------------------------|
 | Format      | `ruff format src/ tests/`                 |
 | Lint        | `ruff check src/ tests/`                  |
 | Tests       | `pytest`                                  |
@@ -36,10 +55,16 @@ Sibling project to `mcp-synology-container`.
 ## Code Standards
 
 - **Type hints** on all public functions and methods.
-- **Docstrings** (English) on all public modules, classes, and functions.
+- **Docstrings** (English, 1 line max for `@mcp.tool()` functions) on all public modules,
+  classes, and functions.
 - **Async-first:** use `httpx.AsyncClient` throughout; never `requests`.
 - **Formatter:** `ruff format` (line length 100).
 - **Linter:** `ruff check` — fix all warnings before committing.
+- **No `-> str` on `@mcp.tool()` functions.** FastMCP generates `outputSchema` from return
+  annotations, which bloats the `tools/list` payload and causes Claude Desktop to truncate
+  the tool list. Omit return type annotations on all tool functions.
+- **Short docstrings on tools.** Keep tool docstrings to 1 line. Long docstrings also bloat
+  the `tools/list` payload.
 
 ## Security Rules
 
@@ -53,8 +78,8 @@ Sibling project to `mcp-synology-container`.
   `overwrite=True` are considered destructive.
 - The `delete` tool MUST require `confirmed=True` to proceed. Without it, return a preview
   message that describes exactly what would be deleted — never silently proceed.
-- For overwrite scenarios in `move`/`copy`/`upload`, include a warning in the tool description
-  and default `overwrite` to `False`.
+- For overwrite scenarios in `move`/`copy`/`upload`, include a warning in the tool
+  description and default `overwrite` to `False`.
 
 ## Error Handling Rules
 
@@ -72,6 +97,39 @@ Sibling project to `mcp-synology-container`.
 - Include item counts and pagination hints where relevant.
 - Error messages are prefixed with `Error:` for easy recognition by Claude.
 
+## DSM Quirks (hard-won knowledge)
+
+- **JSON-encode path parameters:** `path`, `dest_file_path`, `dest_folder_path`, `name` etc.
+  must be passed as `json.dumps("/path")` or `json.dumps(["/path1", "/path2"])`.
+  Plain strings or Python lists are silently ignored by DSM.
+- **Share paths only:** always use `/docker`, `/homes/marcus` — never `/volume1/docker`.
+  Volume paths cause DSM error 408.
+- **`additional` field:** must be `json.dumps(["size","time"])` — comma-separated string
+  does not work.
+- **`List::list` additional:** only `["size","time"]` confirmed working on this firmware.
+  `real_path`, `perm`, `type` cause error 408.
+- **`SYNO.FileStation.Stat`:** not in API registry — use `List::getinfo` instead.
+- **`SYNO.FileStation.CheckExist`:** returns error 400 — use `List::getinfo` instead
+  (entries with `name=null` do not exist).
+- **DirSize / MD5 one-shot:** `finished=true` is returned exactly once, then the task is
+  deleted. Implemented via `_start_and_poll_oneshot()` — never poll again after
+  `finished=true`.
+- **DirSize cold start:** after inactivity, DSM's background service needs ~6–8 s to
+  initialise. During this window every `status` poll returns 599.
+  Fix: restart the task (new `start` call) — up to 6 restarts within a 60 s budget.
+- **DirSize `status` version:** must use `version=1`. Version 2 always returns 599.
+- **`Sharing::delete` id parameter:** must be `json.dumps(link_id)`.
+- **`CheckPermission::write`:** `path` and `filename` are plain strings (no `json.dumps`).
+  Returns `{"blSkip": false}` on success.
+- **`Search::start` folder_path:** must be a JSON array: `json.dumps([path])`.
+  A plain string or `json.dumps(path)` is silently ignored by DSM — it starts an empty
+  search and immediately returns `finished=true, files=[]`.
+- **`Extract::start` parameter name:** the source archive key is `file_path` (not `path`).
+  Both path parameters need `json.dumps()`: `file_path=json.dumps(...)` and
+  `dest_folder_path=json.dumps(...)`.
+- **Error 599:** means "background service not ready / task not found" for DirSize/MD5.
+  Handled by `_start_and_poll_oneshot()`.
+
 ## Module Structure
 
 ```
@@ -88,20 +146,57 @@ src/mcp_synology_filestation/
     └── filestation.py   # register_filestation(mcp, config, client)
 ```
 
-## Implemented Tools
+## Implemented Tools (v0.3.5 — 26 tools)
 
 | Tool                  | Description                                                  |
-|------|-------------|
+|-----------------------|--------------------------------------------------------------|
 | `list_shares`         | List all shared folders with volume usage                    |
 | `list_dir`            | List directory contents with pagination and sorting          |
 | `get_info`            | Get detailed metadata for one or more paths                  |
+| `check_exist`         | Check if one or more paths exist (Yes/No table)              |
 | `search`              | Search for files by glob pattern with async polling          |
 | `download`            | Download a file as base64 (max 10 MB)                        |
 | `create_folder`       | Create a new folder (optionally with parent dirs)            |
 | `rename`              | Rename a file or folder                                      |
-| `copy` | Copy a file or folder (async polling, overwrite=False default) |
-| `move` | Move a file or folder (async polling, overwrite=False default) |
+| `copy`                | Copy a file or folder (async polling, overwrite=False)       |
+| `move`                | Move a file or folder (async polling, overwrite=False)       |
 | `delete`              | Delete a file or folder — requires confirmed=True            |
 | `upload`              | Upload base64-encoded content to a path (max 50 MB)          |
+| `compress`            | Compress paths into a ZIP or 7z archive                      |
+| `extract`             | Extract a ZIP or 7z archive to a destination folder          |
+| `dir_size`            | Total size, file count, folder count for directories         |
+| `get_md5`             | Compute MD5 checksum of a file                               |
+| `check_permission`    | Check write permission for a filename in a directory         |
+| `create_sharing_link` | Create a public sharing link (optional password + expiry)    |
+| `list_sharing_links`  | List all sharing links (paginated table)                     |
+| `delete_sharing_link` | Delete a sharing link by ID                                  |
+| `get_thumbnail`       | Fetch a thumbnail for an image/video file as base64          |
+| `list_favorites`      | List all FileStation user favorites                          |
+| `add_favorite`        | Pin a path as a FileStation favorite                         |
+| `delete_favorite`     | Remove a path from FileStation favorites                     |
+| `background_tasks`    | List FileStation background tasks (copy, move, delete, etc.) |
+| `list_snapshots`      | List Btrfs snapshots for a share (requires Btrfs volume)     |
 
-See [SPEC.md](SPEC.md) for the full planned tool set.
+See [SPEC.md](SPEC.md) for full tool specifications and DSM call details.
+
+## DSM Quirks (continued)
+
+- **`SYNO.FileStation.Snapshot::list`:** Returns error 400 when the share is not on a
+  Btrfs-formatted volume. Confirmed: this NAS has no Btrfs volumes — `list_snapshots`
+  maps error 400 to a clear "requires Btrfs-formatted volume" message.
+- **`SYNO.FileStation.BackgroundTask`:** Only the `list` method is available (v1–v3).
+  No stop/cancel/clear methods exist on this firmware.
+- **`SYNO.FileStation.Thumb` — `quality` parameter ignored:** DSM accepts the `quality`
+  field in the POST body but always returns the same JPEG regardless of the value.
+  No server-side quality control is available.
+- **`SYNO.FileStation.Thumb` — size limits:** `small` thumbnails range from ~5 KB to
+  ~548 KB raw depending on source image resolution. `medium`/`large` can exceed 380 KB
+  raw. `original` reflects the full stored image and may be several MB.
+  The `get_thumbnail` tool enforces: abort >1.5 MB raw (≈2 MB base64), warning >375 KB
+  raw (≈500 KB base64). Default changed from `large` to `small` to avoid MCP buffer
+  overflows.
+
+## Roadmap
+
+### v0.4 — candidates
+No further tools currently planned.

README.md

@@ -1,40 +1,304 @@
 # mcp-synology-filestation
 
-MCP server for Synology FileStation — browse, search, transfer, and manage files
-on your NAS via Claude.
+MCP server that exposes a **Synology NAS FileStation** as tools for Claude Desktop (and any
+other MCP client). All 26 tools are production-tested against DSM 7.x.
 
-## Status
+---
 
-Work in progress. See [SPEC.md](SPEC.md) for the planned tool set.
+## Features
 
-## Planned Tools
+26 tools covering the full FileStation surface:
 
-| Tool | Description |
-|------|-------------|
-| `list_shares` | List all shared folders |
-| `list_dir` | Directory contents with pagination and sorting |
-| `get_info` | File or folder metadata |
-| `search` | Recursive pattern search |
-| `download` | Download a file (base64 content) |
-| `create_folder` | Create a new directory |
-| `rename` | Rename a file or folder |
-| `move` | Move to a new location |
-| `copy` | Copy to a new location |
-| `delete` | Delete a path (requires confirmation) |
-| `upload` | Upload a file from base64 content |
+| Group | Tools |
+|-------|-------|
+| **Browse** | `list_shares`, `list_dir`, `get_info`, `check_exist`, `search` |
+| **Transfer** | `download`, `upload`, `get_thumbnail` |
+| **Organise** | `create_folder`, `rename`, `copy`, `move`, `delete`, `compress`, `extract` |
+| **Analyse** | `dir_size`, `get_md5`, `check_permission` |
+| **Sharing** | `create_sharing_link`, `list_sharing_links`, `delete_sharing_link` |
+| **Favorites** | `list_favorites`, `add_favorite`, `delete_favorite` |
+| **System** | `background_tasks`, `list_snapshots` |
 
-## Setup
+---
+
+## Requirements
+
+- Python 3.12+
+- [`uv`](https://docs.astral.sh/uv/) (recommended) or pip
+- Synology NAS running DSM 7.x with FileStation enabled
+- A DSM user account with FileStation access
+
+---
+
+## Installation
+
+### From Gitea
 
 ```bash
 uv tool install git+https://gitea.gecheckt.de/marcus/mcp-synology-filestation.git
+```
+
+### Reinstall (upgrade)
+
+```bash
+uv tool install --reinstall git+https://gitea.gecheckt.de/marcus/mcp-synology-filestation.git
+```
+
+> **Windows / Claude Desktop:** close Claude Desktop before reinstalling — Windows holds
+> file locks on running executables.
+
+---
+
+## Setup
+
+Run the interactive wizard once to configure the NAS connection and store credentials
+securely in the OS keyring:
+
+```bash
 mcp-synology-filestation setup
 ```
 
+The wizard will:
+1. Ask for your NAS host, port, and HTTPS settings
+2. Ask for your DSM username and password (stored in OS keyring — never written to disk)
+3. Handle 2FA / device token if required
+4. Verify the FileStation API is reachable
+5. Print a ready-to-paste Claude Desktop config snippet
+
+### Verify the setup
+
+```bash
+mcp-synology-filestation check
+```
+
+---
+
+## Claude Desktop integration
+
+Add the server to `claude_desktop_config.json`:
+
+```json
+{
+  "mcpServers": {
+    "synology-filestation": {
+      "command": "mcp-synology-filestation",
+      "args": ["serve"]
+    }
+  }
+}
+```
+
+The server uses **stdio transport** and is fully compatible with Claude Desktop on
+Windows, macOS, and Linux.
+
+### Environment variable overrides
+
+| Variable | Purpose |
+|----------|---------|
+| `SYNOLOGY_HOST` | Override NAS hostname |
+| `SYNOLOGY_USERNAME` | Override DSM username |
+| `SYNOLOGY_PASSWORD` | Override DSM password (not stored) |
+
+---
+
+## Tool reference
+
+### Browse
+
+#### `list_shares`
+List all shared folders with volume usage (total / used / %).
+
+#### `list_dir`
+List a directory's contents with pagination and sorting.
+
+| Parameter | Default | Description |
+|-----------|---------|-------------|
+| `path` | — | Share-relative path (e.g. `/docker`, `/data/photos`) |
+| `offset` | 0 | Items to skip |
+| `limit` | 100 | Max items (hard cap: 500) |
+| `sort_by` | `name` | `name` \| `size` \| `user` \| `group` \| `mtime` \| `atime` \| `crtime` \| `type` |
+| `sort_direction` | `asc` | `asc` \| `desc` |
+
+#### `get_info`
+Detailed metadata (size, owner, permissions, timestamps) for one or more paths.
+Accepts comma-separated paths.
+
+#### `check_exist`
+Yes/No existence check for one or more comma-separated paths.
+
+#### `search`
+Glob-pattern search across a directory tree with async DSM polling.
+
+| Parameter | Default | Description |
+|-----------|---------|-------------|
+| `path` | — | Root directory |
+| `pattern` | — | Filename glob, e.g. `*.log` |
+| `recursive` | `true` | Search subdirectories |
+| `max_results` | 200 | Cap on returned matches |
+
+---
+
+### Transfer
+
+#### `download`
+Download a file as base64-encoded content. Files > 10 MB are rejected.
+Returns JSON: `{filename, size, content_base64}`
+
+#### `upload`
+Upload base64-encoded content to the NAS. Files > 50 MB are rejected.
+
+| Parameter | Default | Description |
+|-----------|---------|-------------|
+| `path` | — | Destination directory |
+| `filename` | — | Name for the new file |
+| `content_base64` | — | Base64-encoded bytes |
+| `overwrite` | `false` | ⚠ Overwrites existing file if `true` |
+| `create_parents` | `true` | Create missing parent directories |
+
+#### `get_thumbnail`
+Fetch a JPEG thumbnail for an image or video file.
+
+| Parameter | Default | Description |
+|-----------|---------|-------------|
+| `path` | — | Share-relative file path |
+| `size` | `small` | `small` \| `medium` \| `large` \| `original` |
+
+Returns JSON: `{filename, size_bytes, content_base64}`.
+A `"warning"` field is added when the thumbnail exceeds ~500 KB base64.
+Thumbnails > ~2 MB base64 are rejected with an error — use `size=small` in that case.
+
+> **Note:** The DSM `quality` parameter has no effect — DSM ignores it. `size=small` is
+> the default and recommended value; larger sizes can exceed MCP buffer limits.
+
+---
+
+### Organise
+
+#### `create_folder`
+Create a folder. Set `create_parents=true` to create intermediate directories.
+
+#### `rename`
+Rename a file or folder. `new_name` is a bare name (not a full path).
+
+#### `copy` / `move`
+Async copy or move. Default `overwrite=false`.
+
+#### `delete`
+**Irreversible.** Requires `confirmed=true`.
+Without it, returns a preview of what would be deleted — nothing is removed.
+
+#### `compress`
+Compress one or more paths into a ZIP or 7z archive (async DSM task).
+
+| Parameter | Default | Description |
+|-----------|---------|-------------|
+| `paths` | — | List of source paths |
+| `dest_file_path` | — | Output archive path including filename |
+| `level` | `moderate` | `store` \| `fastest` \| `fast` \| `normal` \| `moderate` \| `maximum` |
+| `format` | `zip` | `zip` \| `7z` |
+| `password` | `""` | Archive password |
+
+#### `extract`
+Extract a ZIP or 7z archive to a destination folder (async DSM task).
+
+| Parameter | Default | Description |
+|-----------|---------|-------------|
+| `file_path` | — | Archive path on NAS |
+| `dest_folder_path` | — | Destination directory |
+| `overwrite` | `false` | ⚠ Overwrite existing files if `true` |
+| `keep_dir` | `true` | Preserve directory structure |
+| `create_subfolder` | `false` | Extract into a new subfolder |
+| `password` | `""` | Archive password |
+
+---
+
+### Analyse
+
+#### `dir_size`
+Total size, file count, and folder count for one or more directories (comma-separated).
+
+#### `get_md5`
+Compute the MD5 checksum of a file.
+
+#### `check_permission`
+Check whether the current DSM user can write a given filename into a directory.
+
+---
+
+### Sharing
+
+#### `create_sharing_link`
+Create a public sharing link with optional password and expiry date (`YYYY-MM-DD`).
+
+#### `list_sharing_links`
+Paginated table of all sharing links (ID, URL, path, owner, expiry, status).
+
+#### `delete_sharing_link`
+Delete a sharing link by its ID (from `list_sharing_links`).
+
+---
+
+### Favorites
+
+#### `list_favorites`
+List all FileStation user favorites (name, path, type, status, real path, modified).
+
+#### `add_favorite`
+Pin a path as a FileStation favorite with a display label.
+
+#### `delete_favorite`
+Remove a favorite by its path.
+
+---
+
+### System
+
+#### `background_tasks`
+Paginated list of active/recent FileStation background tasks
+(copy, move, delete, extract, compress) with type, status, path, and file progress.
+
+> Only the `list` method is available on DSM 7.x — tasks cannot be cancelled via this API.
+
+#### `list_snapshots`
+List Btrfs snapshots for a shared folder (snapshot ID, creation time, description, locked).
+
+> Requires a Btrfs-formatted volume. Returns a clear error on ext4/non-Btrfs shares
+> ("requires Btrfs-formatted volume").
+
+---
+
 ## Development
 
 ```bash
+# Install with dev dependencies
 uv sync --dev
+
+# Format
+uv run ruff format src/ tests/
+
+# Lint
+uv run ruff check src/ tests/
+
+# Tests (113 tests)
 uv run pytest
-uv run ruff check src/
-uv run ruff format src/
+
+# Run server locally (stdio)
+uv run mcp-synology-filestation serve
 ```
+
+See [CLAUDE.md](CLAUDE.md) for the full development context and
+[SPEC.md](SPEC.md) for DSM API call details and quirks.
+
+---
+
+## Security
+
+- Passwords are stored in the **OS keyring only** — never in the config file or logs.
+- Session IDs and credentials are masked in all debug output.
+- The `delete` tool requires explicit `confirmed=true` to prevent accidents.
+
+---
+
+## License
+
+MIT

SPEC.md

@@ -48,7 +48,7 @@ CLI (click)
 
 ## DSM API Endpoints
 
-All requests use `GET /webapi/entry.cgi` with query parameters unless noted.
+All requests use `POST /webapi/entry.cgi` with `application/x-www-form-urlencoded` body unless noted.
 
 | API | Version | Methods used |
 |-----|---------|--------------|
@@ -62,21 +62,99 @@ All requests use `GET /webapi/entry.cgi` with query parameters unless noted.
 | `SYNO.FileStation.Rename` | 2 | `rename` |
 | `SYNO.FileStation.CopyMove` | 3 | `start`, `status`, `stop` |
 | `SYNO.FileStation.Delete` | 2 | `start`, `status`, `stop` |
+| `SYNO.FileStation.Compress` | 3 | `start`, `status`, `stop` |
+| `SYNO.FileStation.Extract` | 2 | `start`, `status`, `stop` |
+| `SYNO.FileStation.DirSize` | 2/1 | `start` (v2), `status` (v1) |
+| `SYNO.FileStation.MD5` | 2/1 | `start` (v2), `status` (v1) |
+| `SYNO.FileStation.CheckPermission` | 3 | `write` |
+| `SYNO.FileStation.Sharing` | 3 | `create`, `list`, `delete` |
 
-### Async task pattern (CopyMove, Delete, Search)
+### Async task pattern (CopyMove, Delete, Search, Compress, Extract)
 
 DSM returns a `taskid` from `start`; the client polls `status` with exponential backoff
 (initial 200 ms, max 2 s, timeout 60 s) until `finished=true`, then calls `stop`/`clean`.
+Implemented in `_poll_task()`.
+
+### One-shot task pattern (DirSize, MD5)
+
+`DirSize` and `MD5` differ from the async task pattern: DSM delivers `finished=true` exactly
+once, then immediately discards the result (subsequent polls return error 599). Implemented
+in `_start_and_poll_oneshot()`:
+
+1. Call `start`.
+2. Poll `status` repeatedly until `finished=true` or timeout.
+3. On 599: if within the first ~8 s after start, the background service may still be warming
+   up ("cold start") — restart the task and try again (up to 6 restarts).
+4. On `finished=true`: return the data and stop polling (never poll again).
+
+**Cold-start behaviour:** After a period of inactivity, DSM's DirSize/MD5 background service
+takes ~6–8 s to initialise. During this window every `status` poll returns error 599. The
+correct recovery is to wait a moment, then restart the task. Retrying the same `taskid` does
+not help — the service must be cold-started via a new `start` call.
+
+**DirSize `status` version:** Must use `version=1`. Using `version=2` always returns 599
+regardless of service state.
 
 ---
 
-## Tools
+## Tools (v0.3.4 — 26 tools)
 
 ### Read-only
 
-#### `list_shares`
-List all shared folders visible to the authenticated user.
+| Tool | Description |
+|------|-------------|
+| `list_shares` | List all shared folders with volume usage |
+| `list_dir` | List directory contents with pagination and sorting |
+| `get_info` | Get detailed metadata for one or more paths |
+| `check_exist` | Check if one or more paths exist (Yes/No table) |
+| `search` | Search for files by glob pattern with async polling |
+| `download` | Download a file as base64 (max 10 MB) |
+| `dir_size` | Total size, file count, folder count for directories |
+| `get_md5` | Compute MD5 checksum of a file |
 
+### Write
+
+| Tool | Description |
+|------|-------------|
+| `create_folder` | Create a new folder (optionally with parent dirs) |
+| `rename` | Rename a file or folder |
+| `copy` | Copy a file or folder (async polling, overwrite=False default) |
+| `move` | Move a file or folder (async polling, overwrite=False default) |
+| `delete` | Delete a file or folder — requires confirmed=True |
+| `upload` | Upload base64-encoded content to a path (max 50 MB) |
+| `compress` | Compress paths into a ZIP or 7z archive |
+| `extract` | Extract a ZIP or 7z archive to a destination folder |
+
+### Permission & Sharing
+
+| Tool | Description |
+|------|-------------|
+| `check_permission` | Check write permission for a filename in a directory |
+| `create_sharing_link` | Create a public sharing link (optional password + expiry) |
+| `list_sharing_links` | List all sharing links (paginated table) |
+| `delete_sharing_link` | Delete a sharing link by ID |
+
+### Thumbnail & Favorites
+
+| Tool | Description |
+|------|-------------|
+| `get_thumbnail` | Fetch a thumbnail for an image/video file as base64 |
+| `list_favorites` | List all FileStation user favorites |
+| `add_favorite` | Add a path to FileStation favorites |
+| `delete_favorite` | Remove a path from FileStation favorites |
+
+### Background Tasks & Snapshots
+
+| Tool | Description |
+|------|-------------|
+| `background_tasks` | List FileStation background tasks (copy, move, delete, etc.) |
+| `list_snapshots` | List Btrfs snapshots for a shared folder (requires Btrfs volume) |
+
+---
+
+### Tool details
+
+#### `list_shares`
 **Parameters:** none
 
 **Returns:** Formatted table of share names, paths, and volume usage.
@@ -92,8 +170,6 @@ additional=["volume_status"]
 ---
 
 #### `list_dir`
-List contents of a directory with optional pagination and sorting.
-
 **Parameters:**
 | Name | Type | Required | Default | Description |
 |------|------|----------|---------|-------------|
@@ -119,17 +195,11 @@ additional=["size","time"]
 >
 > **`additional` format:** Must be a JSON array serialised as a string
 > (`json.dumps(["size","time"])` → `'["size", "time"]'`). A comma-separated string
-> (`"size,time"`) is silently ignored by DSM — the `additional` field will be absent from
-> every file entry.
->
-> **`SYNO.FileStation.Stat`:** Not available on this NAS's API registry. Use
-> `SYNO.FileStation.List::getinfo` for per-path metadata instead.
+> (`"size,time"`) is silently ignored by DSM.
 
 ---
 
 #### `get_info`
-Get detailed metadata for one or more files or folders.
-
 **Parameters:**
 | Name | Type | Required | Description |
 |------|------|----------|-------------|
@@ -140,19 +210,25 @@ creation time, and real volume path for each requested item.
 
 **DSM call:** `SYNO.FileStation.List::getinfo`
 ```
-path={comma-joined paths},
+path=json.dumps([paths...]),
 additional=["real_path","size","time","perm","owner","type"]
 ```
 
-> **Note:** `SYNO.FileStation.Stat` is not available on all NAS firmware versions and is
-> absent from this NAS's API registry. `SYNO.FileStation.List::getinfo` returns identical
-> data and is confirmed working.
+---
+
+#### `check_exist`
+**Parameters:**
+| Name | Type | Required | Description |
+|------|------|----------|-------------|
+| `path` | str | yes | One or more share-relative paths, comma-separated |
+
+**Returns:** Yes/No table per path.
+
+**DSM call:** `SYNO.FileStation.List::getinfo` — entries with `name=null` are non-existent.
 
 ---
 
 #### `search`
-Search for files matching a pattern within a directory.
-
 **Parameters:**
 | Name | Type | Required | Default | Description |
 |------|------|----------|---------|-------------|
@@ -164,36 +240,48 @@ Search for files matching a pattern within a directory.
 **Returns:** List of matching paths with type, size, and modification time.
 
 **DSM calls:** `SYNO.FileStation.Search::start` → poll `::list` → `::stop` + `::clean`
-```
-start: folder_path={path}, recursive={recursive}, pattern={pattern}
-list:  taskid={taskid}, offset=0, limit={max_results}
-```
 
 ---
 
 #### `download`
-Download a single file and return its content.
-
 **Parameters:**
 | Name | Type | Required | Description |
 |------|------|----------|-------------|
-| `path` | str | yes | Absolute path to the file on the NAS |
+| `path` | str | yes | Share-relative file path |
 
-**Returns:** Object with `filename`, `size`, `content_base64` (base64-encoded file bytes).
-Files larger than 10 MB return an error suggesting `sftp` instead.
+**Returns:** JSON `{filename, size, content_base64}`. Files > 10 MB return an error.
 
-**DSM call:** `SYNO.FileStation.Download::download` (streaming GET)
-```
-path={path}, mode=download
-```
+**DSM call:** `SYNO.FileStation.Download::download` (streaming GET, `mode=download`)
 
 ---
 
-### Write (require explicit confirmation where noted)
+#### `dir_size`
+**Parameters:**
+| Name | Type | Required | Description |
+|------|------|----------|-------------|
+| `path` | str | yes | Comma-separated share-relative paths |
+
+**Returns:** Table with total size, file count, folder count.
+
+**DSM calls:** `SYNO.FileStation.DirSize::start` (v2) → poll `::status` (v1)
+
+> See *One-shot task pattern* above for polling behaviour and cold-start recovery.
+
+---
+
+#### `get_md5`
+**Parameters:**
+| Name | Type | Required | Description |
+|------|------|----------|-------------|
+| `path` | str | yes | Share-relative file path |
+
+**Returns:** `MD5 of {path}: {hash}`
+
+**DSM calls:** `SYNO.FileStation.MD5::start` (v2) → poll `::status` (v1)
+
+---
 
 #### `create_folder`
-Create a new directory (and optionally all intermediate parents).
-
 **Parameters:**
 | Name | Type | Required | Default | Description |
 |------|------|----------|---------|-------------|
@@ -201,113 +289,273 @@ Create a new directory (and optionally all intermediate parents).
 | `name` | str | yes | — | New folder name |
 | `create_parents` | bool | no | false | Create missing parent directories |
 
-**Returns:** Path of the created folder or an error message.
-
 **DSM call:** `SYNO.FileStation.CreateFolder::create`
-```
-folder_path={path}, name={name}, force_parent={create_parents}
-```
 
 ---
 
 #### `rename`
-Rename a file or directory.
-
 **Parameters:**
 | Name | Type | Required | Description |
 |------|------|----------|-------------|
-| `path` | str | yes | Absolute path to the item |
-| `new_name` | str | yes | New filename (not a full path) |
-
-**Returns:** New absolute path after rename.
+| `path` | str | yes | Current share-relative path |
+| `new_name` | str | yes | New filename (bare name, not full path) |
 
 **DSM call:** `SYNO.FileStation.Rename::rename`
-```
-path={path}, name={new_name}
-```
-
----
-
-#### `move`
-Move a file or directory to a new location.
-
-**Parameters:**
-| Name | Type | Required | Default | Description |
-|------|------|----------|---------|-------------|
-| `src` | str | yes | — | Source absolute path |
-| `dst` | str | yes | — | Destination directory path |
-| `overwrite` | bool | no | false | Overwrite if destination exists |
-
-**Returns:** Destination path on success, or a descriptive error.
-
-**DSM call:** `SYNO.FileStation.CopyMove::start` (async task)
-```
-path={src}, dest_folder_path={dst}, overwrite={overwrite}, remove_src=true
-```
 
 ---
 
 #### `copy`
-Copy a file or directory to a new location.
-
 **Parameters:**
 | Name | Type | Required | Default | Description |
 |------|------|----------|---------|-------------|
-| `src` | str | yes | — | Source absolute path |
+| `src` | str | yes | — | Source path |
 | `dst` | str | yes | — | Destination directory path |
 | `overwrite` | bool | no | false | Overwrite if destination exists |
 
-**Returns:** Destination path on success, or a descriptive error.
+**DSM call:** `SYNO.FileStation.CopyMove::start` (async, `remove_src=false`)
 
-**DSM call:** `SYNO.FileStation.CopyMove::start` (async task)
-```
-path={src}, dest_folder_path={dst}, overwrite={overwrite}, remove_src=false
-```
+---
+
+#### `move`
+**Parameters:**
+| Name | Type | Required | Default | Description |
+|------|------|----------|---------|-------------|
+| `src` | str | yes | — | Source path |
+| `dst` | str | yes | — | Destination directory path |
+| `overwrite` | bool | no | false | Overwrite if destination exists |
+
+**DSM call:** `SYNO.FileStation.CopyMove::start` (async, `remove_src=true`)
 
 ---
 
 #### `delete`
 **Destructive — requires `confirmed=True`.**
 
-Delete a file or directory. Without confirmation, returns a preview of what would be deleted.
-
 **Parameters:**
 | Name | Type | Required | Default | Description |
 |------|------|----------|---------|-------------|
-| `path` | str | yes | — | Absolute path to delete |
+| `path` | str | yes | — | Path to delete |
 | `confirmed` | bool | yes | false | Must be `true` to proceed |
 
 **Returns:**
-- `confirmed=false`: Preview message listing the path and item type.
-- `confirmed=true`: Success message or error detail.
+- `confirmed=false`: Preview of what would be deleted.
+- `confirmed=true`: Success message or error.
 
-**DSM call:** `SYNO.FileStation.Delete::start` (async task)
-```
-path={path}, recursive=true, accurate_progress=false
-```
+**DSM call:** `SYNO.FileStation.Delete::start` (async, `recursive=true`)
 
 ---
 
 #### `upload`
-Upload a file to the NAS from base64-encoded content.
-
 **Parameters:**
 | Name | Type | Required | Default | Description |
 |------|------|----------|---------|-------------|
-| `path` | str | yes | — | Destination directory path on the NAS |
+| `path` | str | yes | — | Destination directory path |
 | `filename` | str | yes | — | Filename to create |
 | `content_base64` | str | yes | — | Base64-encoded file content |
-| `overwrite` | bool | no | false | Overwrite if a file with this name already exists |
+| `overwrite` | bool | no | false | Overwrite if file exists |
 | `create_parents` | bool | no | true | Create missing parent directories |
 
-**Returns:** Full path of the uploaded file or an error message.
-Files exceeding 50 MB should not be uploaded via MCP; return a clear error.
+**Returns:** Full path of uploaded file. Files > 50 MB are rejected.
 
 **DSM call:** `SYNO.FileStation.Upload::upload` (POST multipart/form-data)
-```
-path={path}, create_parents={create_parents}, overwrite={overwrite},
-file=<binary content decoded from content_base64>
-```
+
+---
+
+#### `compress`
+**Parameters:**
+| Name | Type | Required | Default | Description |
+|------|------|----------|---------|-------------|
+| `paths` | list[str] | yes | — | Paths to compress |
+| `dest_file_path` | str | yes | — | Output archive path incl. filename |
+| `level` | str | no | `moderate` | `store`/`fastest`/`fast`/`normal`/`moderate`/`maximum` |
+| `mode` | str | no | `add` | `add`/`update`/`refreshen` |
+| `format` | str | no | `zip` | `zip` or `7z` |
+| `password` | str | no | `""` | Archive password |
+
+**DSM call:** `SYNO.FileStation.Compress::start` (async, v3)
+
+---
+
+#### `extract`
+**Parameters:**
+| Name | Type | Required | Default | Description |
+|------|------|----------|---------|-------------|
+| `file_path` | str | yes | — | Archive path on NAS |
+| `dest_folder_path` | str | yes | — | Destination directory |
+| `overwrite` | bool | no | false | Overwrite existing files |
+| `keep_dir` | bool | no | true | Preserve directory structure |
+| `create_subfolder` | bool | no | false | Extract into a subfolder |
+| `password` | str | no | `""` | Archive password |
+
+**DSM call:** `SYNO.FileStation.Extract::start` (async, v2)
+
+---
+
+#### `check_permission`
+**Parameters:**
+| Name | Type | Required | Default | Description |
+|------|------|----------|---------|-------------|
+| `path` | str | yes | — | Directory to check |
+| `filename` | str | yes | — | Filename to check write access for |
+| `overwrite` | bool | no | false | Check overwrite permission |
+| `create_only` | bool | no | false | Check create-only permission |
+
+**Returns:** `"Permission granted: write {filename} into {path}"` or `"Error: …"`
+
+**DSM call:** `SYNO.FileStation.CheckPermission::write` (v3)
+
+> **Parameter format:** `path` and `filename` are passed as plain strings (no `json.dumps`).
+> On success, DSM returns `{"blSkip": false}` — the tool maps this to a human-readable message.
+
+---
+
+#### `create_sharing_link`
+**Parameters:**
+| Name | Type | Required | Default | Description |
+|------|------|----------|---------|-------------|
+| `path` | str | yes | — | File or folder path to share |
+| `password` | str | no | `""` | Password to protect the link |
+| `date_expired` | str | no | `""` | Expiry date (`YYYY-MM-DD`) |
+| `date_available` | str | no | `""` | Availability start date (`YYYY-MM-DD`) |
+
+**Returns:** Sharing URL + link ID, with password-protection flag.
+
+**DSM call:** `SYNO.FileStation.Sharing::create` (v3)
+
+> `path` must be `json.dumps()`-encoded. The `date_expired`/`date_available` fields are not
+> echoed back in the create response — confirm via `list_sharing_links` if needed.
+
+---
+
+#### `list_sharing_links`
+**Parameters:**
+| Name | Type | Required | Default | Description |
+|------|------|----------|---------|-------------|
+| `offset` | int | no | 0 | Pagination offset |
+| `limit` | int | no | 100 | Max links to return |
+
+**Returns:** Table with ID, URL, path, owner, expiry, status. Includes total count and
+pagination hint when more results are available.
+
+**DSM call:** `SYNO.FileStation.Sharing::list` (v3)
+
+---
+
+#### `delete_sharing_link`
+**Parameters:**
+| Name | Type | Required | Description |
+|------|------|----------|-------------|
+| `link_id` | str | yes | Sharing link ID (from `list_sharing_links`) |
+
+**Returns:** `"Deleted sharing link: {link_id}"` or error.
+
+**DSM call:** `SYNO.FileStation.Sharing::delete` (v3)
+
+> `link_id` must be passed as `json.dumps(link_id)` in the `id` parameter.
+
+---
+
+#### `get_thumbnail`
+**Parameters:**
+| Name | Type | Required | Default | Description |
+|------|------|----------|---------|-------------|
+| `path` | str | yes | — | Share-relative path to the image or video file |
+| `size` | str | no | `small` | `small`, `medium`, `large`, or `original` |
+
+**Returns:** JSON `{filename, size_bytes, content_base64}` (JPEG bytes encoded as base64).
+If the thumbnail exceeds the soft limit (≈500 KB base64 / 375 KB raw), the JSON includes
+an additional `"warning"` field advising to use `size='small'`.
+If the thumbnail exceeds the hard limit (≈2 MB base64 / 1.5 MB raw), the tool returns
+`"Error: Thumbnail too large (… KB base64) — use size='small' to get a smaller version."`
+instead of the JSON payload.
+
+**DSM call:** `SYNO.FileStation.Thumb::get` (POST, v2)
+
+> **`quality` parameter is ignored:** DSM accepts `quality` in the request but always
+> returns the same JPEG regardless of the value. No server-side quality control is available.
+>
+> **Size limits confirmed against this NAS:**
+> - `small` → 5 KB–548 KB raw depending on source image resolution.
+> - `medium` / `large` → can exceed 380 KB raw even for modest photos.
+> - `original` → reflects the actual stored image; may be several MB.
+> Default was changed from `large` to `small` to avoid hitting MCP buffer limits.
+>
+> DSM returns image bytes directly when the file has a thumbnail. Non-image content-type
+> indicates a DSM error envelope — the tool parses and surfaces the error code.
+
+---
+
+#### `list_favorites`
+**Parameters:**
+| Name | Type | Required | Default | Description |
+|------|------|----------|---------|-------------|
+| `offset` | int | no | 0 | Pagination offset |
+| `limit` | int | no | 200 | Max items to return |
+
+**Returns:** Table with name, path, type, status, real path, modified time.
+
+**DSM call:** `SYNO.FileStation.Favorite::list` (v2, `additional=["real_path","size","time"]`)
+
+---
+
+#### `add_favorite`
+**Parameters:**
+| Name | Type | Required | Description |
+|------|------|----------|-------------|
+| `path` | str | yes | Share-relative path to pin |
+| `name` | str | yes | Display label for the favorite |
+
+**Returns:** `"Added favorite '{name}' → {path}"` or error.
+
+**DSM call:** `SYNO.FileStation.Favorite::add` (v2, `index=-1`)
+
+---
+
+#### `delete_favorite`
+**Parameters:**
+| Name | Type | Required | Description |
+|------|------|----------|-------------|
+| `path` | str | yes | Share-relative path of the favorite to remove |
+
+**Returns:** `"Deleted favorite for {path}"` or error.
+
+**DSM call:** `SYNO.FileStation.Favorite::delete` (v2)
+
+---
+
+#### `background_tasks`
+**Parameters:**
+| Name | Type | Required | Default | Description |
+|------|------|----------|---------|-------------|
+| `offset` | int | no | 0 | Pagination offset |
+| `limit` | int | no | 100 | Max tasks to return (capped at 200) |
+
+**Returns:** Table with task ID, type, status, path, and file progress. Includes total count
+and a pagination hint when more results are available.
+
+**DSM call:** `SYNO.FileStation.BackgroundTask::list` (v3)
+
+> Only the `list` method is available on this NAS — tasks cannot be stopped or cleared
+> via this API.
+
+---
+
+#### `list_snapshots`
+**Parameters:**
+| Name | Type | Required | Default | Description |
+|------|------|----------|---------|-------------|
+| `share_path` | str | yes | — | Share-relative root path (e.g. `/docker`) |
+| `offset` | int | no | 0 | Pagination offset |
+| `limit` | int | no | 100 | Max snapshots to return (capped at 500) |
+
+**Returns:** Table with snapshot ID, creation time, description, and locked flag. Includes
+total count and a pagination hint when more results are available.
+
+**DSM call:** `SYNO.FileStation.Snapshot::list` (v2, `folder_path={share_path}`)
+
+> **Btrfs required:** DSM returns error 400 when the share is not on a Btrfs volume.
+> The tool maps this to a clear message: *"Snapshots not available — requires Btrfs-formatted
+> volume."*
 
 ---
 
@@ -317,8 +565,7 @@ file=<binary content decoded from content_base64>
 1. DSM error codes are mapped to human-readable messages before surfacing to Claude.
 2. Never expose raw stack traces or session IDs in tool responses.
 3. Auth errors (codes 400–403) trigger a clear message with a hint to run `setup`.
-4. Session expiry errors (106, 107, 119) are retried once transparently; if the retry also
-   fails, the user sees "Session expired — please restart the MCP server."
+4. Session expiry errors (106, 107, 119) are retried once transparently.
 5. Network errors (timeouts, connection refused) are reported as
    "Cannot reach NAS at {host} — check connectivity."
 6. Unknown DSM error codes are reported as "DSM error {code}: {raw_message}".
@@ -339,7 +586,8 @@ file=<binary content decoded from content_base64>
 | 401 | Guest or disabled account | "DSM account is disabled." |
 | 403 | 2FA required | "Two-factor authentication required — run setup." |
 | 404 | 2FA failed | "OTP code incorrect." |
-| 408 | Device token required | "Device token required — run setup again." |
+| 408 | Non-supported additional field | "DSM rejected additional fields — check parameter format." |
+| 599 | Background service not ready | (handled by `_start_and_poll_oneshot` — restart task) |
 | 1800 | File not found | "File or folder not found: {path}" |
 | 1801 | No write permission | "No write permission for: {path}" |
 | 1802 | File exists | "A file already exists at this path." |
@@ -351,6 +599,59 @@ file=<binary content decoded from content_base64>
 
 ---
 
+## DSM API Quirks
+
+### Parameter encoding
+
+- **JSON array parameters** (`path`, `additional`, etc.) must be serialised with
+  `json.dumps()`. A plain Python list or comma-separated string is silently ignored
+  by DSM — the field will be absent from the response.
+- **`path` for multi-item operations** (e.g. `List::getinfo`, `DirSize::start`):
+  always pass as `json.dumps(["/path1", "/path2"])`, even for a single path.
+- **`path` for single-item operations** (e.g. `CopyMove::start`, `Rename::rename`,
+  `Sharing::create`): pass as `json.dumps("/path")` (a JSON-encoded string).
+- **`Sharing::delete` `id` parameter:** must be `json.dumps(link_id)` — plain string
+  is not accepted.
+- **`CheckPermission::write` `path` and `filename`:** pass as plain strings (no
+  `json.dumps`).
+- **Share paths vs. volume paths:** always use share paths (`/docker`, `/homes/marcus`).
+  Volume paths (`/volume1/docker`) cause DSM error 408.
+
+### APIs confirmed NOT available on this NAS
+
+| API | Status | Workaround |
+|-----|--------|------------|
+| `SYNO.FileStation.Stat` | Not in API registry | Use `List::getinfo` |
+| `SYNO.FileStation.CheckExist` | Returns error 400 | Use `List::getinfo` (entries with `name=null` don't exist) |
+
+### FastMCP `outputSchema` / tools/list payload limit
+
+Do **not** add `-> str` return type annotations to `@mcp.tool()` functions. FastMCP
+infers `outputSchema` from the annotation, which doubles the tools/list payload size.
+Claude Desktop truncates the tool list when the payload exceeds its limit, making some
+tools invisible. Omitting the return annotation suppresses `outputSchema` generation.
+
+### DirSize / MD5 one-shot behaviour
+
+`DirSize` and `MD5` tasks are consumed on first read: `finished=true` is returned exactly
+once, then the task is deleted and all subsequent `status` polls return error 599.
+Implementation: `_start_and_poll_oneshot()` — never call `status` a second time after
+receiving `finished=true`.
+
+### DirSize cold-start
+
+After a period of inactivity, DSM's DirSize background service needs ~6–8 s to initialise.
+During cold start, `status` returns 599 on every poll. The fix is to wait briefly and
+**restart** the task (new `start` call) — polling the original `taskid` again does not help.
+`_start_and_poll_oneshot()` retries up to 6 task restarts before giving up.
+
+### DirSize `status` API version
+
+`SYNO.FileStation.DirSize::status` must be called with `version=1`. Using `version=2`
+always returns error 599 regardless of whether the background service is running.
+
+---
+
 ## Configuration Model
 
 ```yaml
@@ -402,3 +703,28 @@ Validate config, resolve credentials, test login, list available FileStation API
 Load config and credentials, create `FileStationClient` (lazy — no immediate connection),
 create and run `FastMCP("mcp-synology-filestation")` over stdio. Uses `anyio.run()` for
 Windows compatibility.
+
+---
+
+## Roadmap
+
+### v0.2 — complete (20 tools)
+
+All tools shipped in v0.2.10:
+
+**Group 1:** `list_shares`, `list_dir`, `get_info`, `check_exist`, `search`, `download`
+**Group 2:** `create_folder`, `rename`, `copy`, `move`, `delete`, `upload`, `compress`,
+`extract`, `dir_size`, `get_md5`
+**Group 3:** `check_permission`, `create_sharing_link`, `list_sharing_links`,
+`delete_sharing_link`
+
+### v0.3 — candidates
+
+| Tool | API | Notes |
+|------|-----|-------|
+| `get_thumbnail` | `SYNO.FileStation.Thumb` | Return base64 thumbnail for image/video |
+| `list_favorites` | `SYNO.FileStation.Favorite` | List user-pinned favourite paths |
+| `add_favorite` | `SYNO.FileStation.Favorite` | Pin a path as favourite |
+| `delete_favorite` | `SYNO.FileStation.Favorite` | Remove a favourite |
+| `list_snapshots` | `SYNO.FileStation.Snapshot` | List Btrfs snapshots for a share |
+| `background_tasks` | `SYNO.FileStation.BackgroundTask` | List/cancel background operations |

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "mcp-synology-filestation"
-version = "0.1.0"
+version = "0.4.0"
 description = "MCP server for Synology FileStation"
 requires-python = ">=3.12"
 dependencies = [
@@ -10,6 +10,7 @@ dependencies = [
     "keyring>=25.0.0",
     "click>=8.1.0",
     "rich>=13.0.0",
+    "pypdf>=4.0.0",
 ]
 
 [project.optional-dependencies]

src/mcp_synology_filestation/__init__.py

@@ -1,3 +1,3 @@
 """MCP server for Synology FileStation."""
 
-__version__ = "0.1.0"
+__version__ = "0.4.0"

src/mcp_synology_filestation/client.py

@@ -247,8 +247,6 @@ class FileStationClient:
         Raises:
             SynologyError: On API errors.
         """
-        sys.stderr.write(f"[dsm] request: {api}/{method}\n")
-        sys.stderr.flush()
         if not self._initializing:
             await self._ensure_initialized()
         http = self._get_http()
@@ -429,3 +427,61 @@ class FileStationClient:
 
         code = body.get("error", {}).get("code", 0)
         raise SynologyError(_error_message(code, api), code=code)
+
+    async def get_thumbnail_bytes(self, path: str, size: str = "large") -> bytes:
+        """Fetch a thumbnail for a file via SYNO.FileStation.Thumb.
+
+        Args:
+            path: Share-relative path to the image file.
+            size: Thumbnail size — "small", "medium", "large", or "original".
+
+        Returns:
+            Raw JPEG bytes.
+
+        Raises:
+            SynologyError: On HTTP 404 (file not found), non-200 status,
+                or DSM error in the response body.
+        """
+        api = "SYNO.FileStation.Thumb"
+        await self._ensure_initialized()
+        http = self._get_http()
+
+        if api not in self._api_cache:
+            raise SynologyError(f"API '{api}' not found.", code=102)
+
+        info = self._api_cache[api]
+        url = f"{self._base_url}/webapi/{info['path']}"
+
+        req_params: dict[str, str] = {
+            "api": api,
+            "version": "2",
+            "method": "get",
+            "path": path,
+            "size": size,
+            "rotate": "0",
+        }
+        if self._sid:
+            req_params["_sid"] = self._sid
+
+        logger.debug("DSM POST: %s/get v2 — path=%s size=%s", api, path, size)
+        resp = await http.post(url, data=req_params)
+
+        if resp.status_code == 404:
+            raise SynologyError(f"File not found: {path}", code=404)
+
+        if resp.status_code != 200:
+            raise SynologyError(
+                f"Thumbnail request failed (HTTP {resp.status_code})", code=resp.status_code
+            )
+
+        content_type = resp.headers.get("content-type", "")
+        if not content_type.startswith("image/"):
+            # DSM returned an error envelope instead of image data
+            try:
+                body = resp.json()
+                code = body.get("error", {}).get("code", 0)
+                raise SynologyError(_error_message(code, api), code=code)
+            except (ValueError, KeyError):
+                raise SynologyError(f"Unexpected response content-type: {content_type}") from None
+
+        return resp.content

tests/test_read_text.py

@@ -0,0 +1,227 @@
+"""Tests for read_text tool."""
+
+from __future__ import annotations
+
+from unittest.mock import AsyncMock, MagicMock, patch
+
+import pytest
+
+from mcp_synology_filestation.client import SynologyError
+from mcp_synology_filestation.config import AppConfig, ConnectionConfig
+
+
+@pytest.fixture()
+def config() -> AppConfig:
+    return AppConfig(
+        schema_version=1,
+        connection=ConnectionConfig(host="nas.example.com"),
+    )
+
+
+def _make_tools(config: AppConfig, client: MagicMock) -> dict:
+    from mcp_synology_filestation.tools.filestation import register_filestation
+
+    registered: dict[str, object] = {}
+    mcp = MagicMock()
+
+    def tool_decorator():
+        def decorator(fn):
+            registered[fn.__name__] = fn
+            return fn
+
+        return decorator
+
+    mcp.tool = tool_decorator
+    register_filestation(mcp, config, client)
+    return registered
+
+
+def _mock_pdf_reader(pages_text: list[str]) -> MagicMock:
+    """Build a mock PdfReader whose .pages list returns the given text per page."""
+    mock_pages = []
+    for text in pages_text:
+        page = MagicMock()
+        page.extract_text.return_value = text
+        mock_pages.append(page)
+    reader = MagicMock()
+    reader.pages = mock_pages
+    return reader
+
+
+# ── TXT / plain text ──────────────────────────────────────────────────────
+
+
+@pytest.mark.asyncio
+async def test_read_text_txt_success(config: AppConfig) -> None:
+    """TXT file content is decoded and returned with header."""
+    client = MagicMock()
+    client.download_bytes = AsyncMock(return_value=("readme.txt", b"Hello, world!"))
+
+    tools = _make_tools(config, client)
+    result = await tools["read_text"]("/docs/readme.txt")
+
+    assert "readme.txt" in result
+    assert "Hello, world!" in result
+    assert "13 chars" in result  # len("Hello, world!") == 13
+
+
+@pytest.mark.asyncio
+async def test_read_text_md_success(config: AppConfig) -> None:
+    """Markdown file is treated as plain text."""
+    client = MagicMock()
+    client.download_bytes = AsyncMock(return_value=("notes.md", b"# Title\n\nBody text."))
+
+    tools = _make_tools(config, client)
+    result = await tools["read_text"]("/docs/notes.md")
+
+    assert "notes.md" in result
+    assert "# Title" in result
+    assert "Body text." in result
+
+
+# ── PDF extraction ────────────────────────────────────────────────────────
+
+
+@pytest.mark.asyncio
+async def test_read_text_pdf_all_pages(config: AppConfig) -> None:
+    """PDF all-pages mode joins pages with separator."""
+    client = MagicMock()
+    client.download_bytes = AsyncMock(return_value=("report.pdf", b"%PDF-1.4 stub"))
+
+    mock_reader = _mock_pdf_reader(["First page text.", "Second page text."])
+    tools = _make_tools(config, client)
+
+    with patch("pypdf.PdfReader", return_value=mock_reader):
+        result = await tools["read_text"]("/docs/report.pdf")
+
+    assert "report.pdf" in result
+    assert "First page text." in result
+    assert "Second page text." in result
+    assert "--- Page 2 ---" in result
+
+
+@pytest.mark.asyncio
+async def test_read_text_pdf_single_page(config: AppConfig) -> None:
+    """PDF single-page mode returns only the requested page."""
+    client = MagicMock()
+    client.download_bytes = AsyncMock(return_value=("doc.pdf", b"%PDF-1.4 stub"))
+
+    mock_reader = _mock_pdf_reader(["Page one.", "Page two.", "Page three."])
+    tools = _make_tools(config, client)
+
+    with patch("pypdf.PdfReader", return_value=mock_reader):
+        result = await tools["read_text"]("/docs/doc.pdf", page=2)
+
+    assert "Page 2/3" in result
+    assert "Page two." in result
+    assert "Page one." not in result
+    assert "Page three." not in result
+
+
+@pytest.mark.asyncio
+async def test_read_text_pdf_page_out_of_range(config: AppConfig) -> None:
+    """Requesting a page beyond the PDF page count returns an error."""
+    client = MagicMock()
+    client.download_bytes = AsyncMock(return_value=("doc.pdf", b"%PDF-1.4 stub"))
+
+    mock_reader = _mock_pdf_reader(["Only page."])
+    tools = _make_tools(config, client)
+
+    with patch("pypdf.PdfReader", return_value=mock_reader):
+        result = await tools["read_text"]("/docs/doc.pdf", page=5)
+
+    assert result.startswith("Error:")
+    assert "5" in result
+    assert "1" in result  # total pages
+
+
+@pytest.mark.asyncio
+async def test_read_text_pdf_image_only(config: AppConfig) -> None:
+    """PDF with no extractable text returns image-only error."""
+    client = MagicMock()
+    client.download_bytes = AsyncMock(return_value=("scan.pdf", b"%PDF-1.4 stub"))
+
+    mock_reader = _mock_pdf_reader(["", ""])  # no text on any page
+    tools = _make_tools(config, client)
+
+    with patch("pypdf.PdfReader", return_value=mock_reader):
+        result = await tools["read_text"]("/docs/scan.pdf")
+
+    assert result.startswith("Error:")
+    assert "image-only" in result.lower() or "No extractable text" in result
+
+
+# ── max_chars truncation ──────────────────────────────────────────────────
+
+
+@pytest.mark.asyncio
+async def test_read_text_max_chars_truncation(config: AppConfig) -> None:
+    """Text exceeding max_chars is truncated with a hint."""
+    long_text = "A" * 200
+    client = MagicMock()
+    client.download_bytes = AsyncMock(return_value=("big.txt", long_text.encode()))
+
+    tools = _make_tools(config, client)
+    result = await tools["read_text"]("/data/big.txt", max_chars=50)
+
+    assert "Truncated" in result
+    assert "200 total chars" in result
+    assert "showing first 50" in result
+    # The returned content before the truncation note must be exactly 50 'A's
+    assert "A" * 50 in result
+
+
+@pytest.mark.asyncio
+async def test_read_text_max_chars_zero_no_limit(config: AppConfig) -> None:
+    """max_chars=0 disables truncation."""
+    long_text = "B" * 100_000
+    client = MagicMock()
+    client.download_bytes = AsyncMock(return_value=("huge.txt", long_text.encode()))
+
+    tools = _make_tools(config, client)
+    result = await tools["read_text"]("/data/huge.txt", max_chars=0)
+
+    assert "Truncated" not in result
+    assert "B" * 100 in result  # spot-check some content
+
+
+# ── error cases ───────────────────────────────────────────────────────────
+
+
+@pytest.mark.asyncio
+async def test_read_text_unsupported_type(config: AppConfig) -> None:
+    """Unknown file extension returns an unsupported-type error."""
+    client = MagicMock()
+    client.download_bytes = AsyncMock(return_value=("binary.exe", b"\x00\x01\x02"))
+
+    tools = _make_tools(config, client)
+    result = await tools["read_text"]("/bin/binary.exe")
+
+    assert result.startswith("Error:")
+    assert "Unsupported file type" in result
+
+
+@pytest.mark.asyncio
+async def test_read_text_file_too_large(config: AppConfig) -> None:
+    """Files exceeding 10 MB return a size error without downloading the full content."""
+    oversized = b"x" * (10 * 1024 * 1024 + 1)
+    client = MagicMock()
+    client.download_bytes = AsyncMock(return_value=("big.txt", oversized))
+
+    tools = _make_tools(config, client)
+    result = await tools["read_text"]("/data/big.txt")
+
+    assert result.startswith("Error:")
+    assert "10 MB" in result
+
+
+@pytest.mark.asyncio
+async def test_read_text_dsm_error(config: AppConfig) -> None:
+    """DSM errors from download are surfaced as Error: messages."""
+    client = MagicMock()
+    client.download_bytes = AsyncMock(side_effect=SynologyError(1800, "File not found"))
+
+    tools = _make_tools(config, client)
+    result = await tools["read_text"]("/missing/file.txt")
+
+    assert result.startswith("Error:")

uv.lock

@@ -362,7 +362,7 @@ wheels = [
 
 [[package]]
 name = "mcp-synology-filestation"
-version = "0.1.0"
+version = "0.3.6"
 source = { editable = "." }
 dependencies = [
     { name = "click" },