scrapbox-cosense-mcp

日本語ドキュメント / Japanese

Overview

MCP server for Cosense (formerly Scrapbox).

| Tool | Description | Auth Required |
|------|-------------|:---:|
| get_page | Get page content, metadata, and links | For private projects |
| list_pages | Browse pages with sorting and pagination (max 1000) | For private projects |
| search_pages | Full-text search with keyword highlighting (max 100 results) | For private projects |
| create_page | Create a page via WebSocket API with Markdown/Scrapbox body | Yes |
| get_page_url | Generate direct URL for a page | No |
| insert_lines | Insert text after a specified line in a page | Yes |
| edit_lines | Replace exact-match line(s), including a multi-line block (first match, or all with matchAll) | Yes |
| delete_lines | Delete exact-match line(s), including a multi-line block (first match, or all with matchAll) | Yes |
| delete_page | Delete a page by emptying every line — opt-in, see below | Yes |
| rewrite_page | Replace a page's entire content — opt-in, see below | Yes |
| get_smart_context | Get a page and its linked pages (1-hop/2-hop) in AI-optimized format | Yes |

create_page, insert_lines, edit_lines, and rewrite_page support a format parameter ("markdown" or "scrapbox") to control content conversion.

edit_lines replaces only the first matching line by default. Set matchAll: true to replace every occurrence. The default is deliberately conservative: a line such as a bullet marker or a blank line can repeat many times in a page, and replacing all of them at once is rarely what the caller intended.

targetLineText may contain newlines to match a contiguous block of lines. The block is replaced as a whole, so n lines can become m lines (for example, collapsing several lines into one). Block matches with matchAll: true are non-overlapping.

delete_lines uses the same exact-match (and block) semantics but removes the matched lines instead of replacing them. It refuses to delete the title line (the first line), because that would rename or remove the page itself — use delete_page for that.

delete_page and rewrite_page are opt-in

delete_page and rewrite_page are not registered unless COSENSE_ENABLE_DELETE=true is set. Without it neither tool appears in the tool list at all, so an agent cannot call them even by mistake. This server is often added to a shared MCP configuration, so whole-page destruction is exposed only to those who deliberately turn it on.

The reasoning: insert_lines, edit_lines, and delete_lines all require an exact match, which is only possible if the caller has actually read the page — they can only destroy lines they already know. delete_page and rewrite_page act on the entire page regardless of whether the caller has read it, so they get a separate opt-in gate.

delete_page empties every one of a page's lines, and Cosense removes a page once all of its lines are empty. There is no undo. Two further guards are built in:

- The page must already exist. A missing page returns an error rather than a silent success. (The REST API returns a title line even for a page that was never created, so the check looks at persistent, the same way create_page does.)
- dryRun: true reports how many lines would be removed and shows the first five of them, without touching the page.

rewrite_page replaces a page's entire content (the title is preserved as the first line). It has the same guards, plus two of its own:

- The page must already exist — the persistent check is inverted relative to create_page, so a typo cannot silently create a new page.
- Empty content is rejected — removing a page is delete_page's job.
- dryRun: true reports the before/after line counts and previews without touching the page.

When you run several instances of this server for different projects, set the variable on each instance that should be allowed to delete:

{
  "mcpServers": {
    "cosense-notes": {
      "command": "npx",
      "args": ["-y", "scrapbox-cosense-mcp"],
      "env": {
        "COSENSE_PROJECT_NAME": "notes",
        "COSENSE_SID": "s:your-session-id",
        "COSENSE_TOOL_SUFFIX": "notes",
        "COSENSE_ENABLE_DELETE": "true"
      }
    },
    "cosense-archive": {
      "command": "npx",
      "args": ["-y", "scrapbox-cosense-mcp"],
      "env": {
        "COSENSE_PROJECT_NAME": "archive",
        "COSENSE_SID": "s:your-session-id",
        "COSENSE_TOOL_SUFFIX": "archive"
      }
    }
  }
}

Here the notes instance exposes delete_page_notes, while the archive instance exposes no deletion tool at all.

Note that insert_lines and edit_lines behave differently when the target line is absent. insert_lines appends to the end of the page, because "add this text somewhere" still has a reasonable outcome. edit_lines returns an error and leaves the page untouched, because "replace this specific line" has no meaningful fallback — appending the replacement would silently produce a page the caller never asked for.

Quick Start

Desktop Extension (.mcpb) — Easiest

1. Download scrapbox-cosense-mcp.mcpb from GitHub Releases
2. Double-click — Claude Desktop opens an install dialog
3. Enter your project name (and Session ID for private projects)

Claude Code Plugin

1. Add the marketplace:

   /plugin marketplace add worldnine/scrapbox-cosense-mcp

   

   /plugin install scrapbox-cosense@worldnine-scrapbox-cosense-mcp

   

   {

     "env": {

       "COSENSE_PROJECT_NAME": "your_project_name",

       "COSENSE_SID": "your_sid"

     }

   }

   

The plugin includes MCP server configuration and a /cosense skill for CLI operations.

Claude Code (Manual MCP Setup)

If you prefer manual configuration over the plugin:

claude mcp add scrapbox-cosense-mcp \
  -e COSENSE_PROJECT_NAME=your_project \
  -e COSENSE_SID=your_sid \
  -- npx -y scrapbox-cosense-mcp

Claude Desktop / Other MCP Clients

Add to your config file:

| Client | Config File |
|--------|-------------|
| Claude Desktop (macOS) | ~/Library/Application Support/Claude/claude_desktop_config.json |
| Claude Desktop (Windows) | %APPDATA%/Claude/claude_desktop_config.json |
| Cursor | .cursor/mcp.json (project root) |
| Windsurf | ~/.codeium/windsurf/mcp_config.json |

{
  "mcpServers": {
    "scrapbox-cosense-mcp": {
      "command": "npx",
      "args": ["-y", "scrapbox-cosense-mcp"],
      "env": {
        "COSENSE_PROJECT_NAME": "your_project_name",
        "COSENSE_SID": "your_sid"
      }
    }
  }
}

Build from Source

git clone https://github.com/worldnine/scrapbox-cosense-mcp.git
cd scrapbox-cosense-mcp
npm install && npm run build

Configuration

Required

| Variable | Description |
|----------|-------------|
| COSENSE_PROJECT_NAME | Your Scrapbox/Cosense project name |
| COSENSE_SID | Session ID (connect.sid cookie) for private projects — How to get it |

Optional

| Variable | Default | Description |
|----------|---------|-------------|
| API_DOMAIN | scrapbox.io | API domain |
| SERVICE_LABEL | cosense (scrapbox) | Display name in tool descriptions |
| COSENSE_PAGE_LIMIT | 100 | Initial page fetch limit (1–1000) |
| COSENSE_SORT_METHOD | updated | Initial sort: updated, created, accessed, linked, views, title |
| COSENSE_TOOL_SUFFIX | — | Tool name suffix for multiple instances (e.g. main → get_page_main) |
| COSENSE_CONVERT_NUMBERED_LISTS | false | Convert numbered lists to bullet lists in Markdown conversion |
| COSENSE_EXCLUDE_PINNED | false | Exclude pinned pages from initial resource list |
| COSENSE_ENABLE_DELETE | false | Register the delete_page and rewrite_page tools (and the delete / rewrite CLI commands). Without it, none are available |

CLI Usage

The same binary also works as a standalone CLI:

scrapbox-cosense-mcp get "Page Title"
scrapbox-cosense-mcp search "keyword"
scrapbox-cosense-mcp list --sort=updated --limit=20
scrapbox-cosense-mcp create "New Page" --body="Markdown content"
scrapbox-cosense-mcp insert "Page" --after="target line" --text="new text"
scrapbox-cosense-mcp edit "Page" --target="old line" --text="new text"
scrapbox-cosense-mcp delete-lines "Page" --target="old line"
scrapbox-cosense-mcp delete "Page" --dry-run   # needs COSENSE_ENABLE_DELETE=true
scrapbox-cosense-mcp rewrite "Page" --body="new content" --dry-run   # needs COSENSE_ENABLE_DELETE=true
scrapbox-cosense-mcp url "Page Title"

| Flag | Description |
|------|-------------|
| --compact | Token-efficient compact output (recommended for AI agents) |
| --project=NAME | Override project name |
| --json | Output as JSON |
| --help | Show help (supports <command> --help for details) |

Multiple Projects

All tools accept an optional projectName parameter to target a different project from a single server. For multiple private projects with different credentials, run separate server instances with COSENSE_TOOL_SUFFIX.

See docs/multiple-projects.md for detailed configuration examples.

Development

| Command | Description |
|---------|-------------|
| npm run build | Build (TypeScript → JavaScript) |
| npm run watch | Auto-rebuild during development |
| npm test | Run test suite |
| npm run lint | Run ESLint |
| npm run inspector | Debug with MCP Inspector |

Contributing

1. Create a feature branch from main
2. Add tests for your changes
3. Run npm run lint && npm test
4. Create a pull request — CI runs automatically

License

MIT

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