scrapbox-cosense-mcp

日本語ドキュメント / Japanese

Overview

MCP server for Cosense (formerly Scrapbox).

`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

2. Install the plugin:

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

Installs globally by default. Use `--scope project` or `--scope local` for other scopes.

3. Set environment variables in your settings file:

{
     "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:

{
  "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

Optional

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"

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

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