# io.github.crabcrop/crabcrop (npm · @crabcrop/mcp)

Sign and explain crabcrop image URLs, fetch processed-image metadata, and purge cached results.

- Trust score: 64/100 (medium)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- npm · `@crabcrop/mcp`: 64/100 (this document), [markdown](https://verifymcp.io/servers/crabcrop-crabcrop/crabcrop-mcp.md), [page](https://verifymcp.io/servers/crabcrop-crabcrop/crabcrop-mcp)

## Channel facts

- Registry: `npm`
- Package: `@crabcrop/mcp`
- Version: `0.1.0`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Supply Chain Security**: 75/100
  - No malware found by supply-chain analysis.
  - Known CVEs were checked across the 0 of 1 dependencies we could resolve, so this covers what we could see, not the whole tree.
  - No install/post-install scripts declared.
  - Dependency health was assessed across the 0 of 1 dependencies we could resolve, so this covers what we could see, not the whole tree.
- **Provenance & Transparency**: 48/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 10 days ago).
  - Publishes a security disclosure policy (SECURITY.md).
- **Schema Quality & AI Usability**: 73/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 649 tokens (~162/item across 4 items; 4 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 37/100
  - Stability observed for 11 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 75/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - 0 of 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation; "purge_result" implies "purge" and declares no destructiveHint at all, which the MCP spec reads as destructive by default.
  - An AI judge read all 4 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 20/100
  - Spec-recency check failed: implements MCP spec 2024-11-05; the latest is 2026-07-28.

## Install

### How do I install the io.github.crabcrop/crabcrop MCP server?

io.github.crabcrop/crabcrop runs locally as an npm package, launched with npx -y @crabcrop/mcp. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add crabcrop-crabcrop -- npx -y @crabcrop/mcp
```

### Cursor

```json
{
  "mcpServers": {
    "crabcrop-crabcrop": {
      "command": "npx",
      "args": [
        "-y",
        "@crabcrop/mcp"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "crabcrop-crabcrop": {
      "command": "npx",
      "args": [
        "-y",
        "@crabcrop/mcp"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add crabcrop-crabcrop -- npx -y @crabcrop/mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "crabcrop-crabcrop": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@crabcrop/mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add crabcrop-crabcrop --command npx --arg -y --arg @crabcrop/mcp
```

### Hermes

```yaml
mcp_servers:
  crabcrop-crabcrop:
    command: "npx"
    args: ["-y", "@crabcrop/mcp"]
```

### Netclaw

```json
{
  "McpServers": {
    "crabcrop-crabcrop": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "@crabcrop/mcp"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add crabcrop-crabcrop -t stdio -c npx -a -y @crabcrop/mcp
```

### Other

```json
{
  "mcpServers": {
    "crabcrop-crabcrop": {
      "command": "npx",
      "args": [
        "-y",
        "@crabcrop/mcp"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-05 (score 64, +1)

No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-03 (score 63, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-01 (score 62, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-30 (score 61, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-27 (score 60, +2)

- [functional improvement] Stability: unverified → 0.07
- [functional improvement] Security disclosure: fail → pass

### 2026-10-26 (score 58, +15)

- [security improvement] Malware scan: unverified → pass

### 2026-10-25 (score 43)

First indexed and scored.

## MCP tools (4)

### `sign_url` (~272 tokens)

Build and sign a crabcrop URL from an operation string and a source. Returns the full URL. Uses CRABCROP_BASE / CRABCROP_SECRET from the environment unless base/secret arguments override them; with no secret the URL carries the literal `unsafe` signature segment. Prefer the environment for the secret: per-call secret arguments are deprecated.

Input parameters:

- `base` (string): crabcrop endpoint origin. Defaults to CRABCROP_BASE.
- `expires` (number): Optional unix-seconds expiry, emitted as an exp: segment.
- `keyId` (string): Optional key ID stamped on the signature segment (`<key-id>:<tag>`) for servers running a secret rotation; they verify a keyed segment against the named key only.
- `operations` (string, required): Operation string, e.g. "crop:1200x630:smart/filters:format(webp)"; may be empty and may contain preset: references.
- `secret` (string): Signing secret. Defaults to CRABCROP_SECRET; omit for unsafe URLs. Sensitive, deprecated: prefer the CRABCROP_SECRET environment variable; a per-call secret is kept in client transcripts.
- `source` (string, required): Source locator: an http(s) URL, s3://bucket/key, gs://bucket/key, or file:// path.

### `explain_url` (~75 tokens)

Parse a crabcrop URL back into its pieces: the signature kind, each operation segment with a plain-language explanation, exp: rendered as a UTC instant with an expired verdict, and the source. Malformed segments and unknown filters are reported as errors.

Input parameters:

- `url` (string, required): The full crabcrop URL or bare path.

### `fetch_meta` (~100 tokens)

Fetch the crabcrop meta JSON for a URL (the processed result's width, height, format, byte size, quality, and placeholder data on request). The URL must already be signed if the server requires signatures. For safety the URL's origin must match CRABCROP_BASE: this tool will not fetch arbitrary URLs.

Input parameters:

- `placeholders` (boolean): Also request placeholder data (default false).
- `url` (string, required): The full crabcrop URL.

### `purge_result` (~202 tokens)

Evict a cached result from a crabcrop server. The path is the cached URL's remainder after its signature (operations and source; a preset URL works as-is, the server expands it). Requires the signing secret (argument or CRABCROP_SECRET). Returns how many entries were removed. For safety the request only goes to the configured CRABCROP_BASE origin (a base argument must match it) and paths with dot segments are refused: this tool will not POST to arbitrary endpoints.

Input parameters:

- `base` (string): crabcrop endpoint origin. Defaults to CRABCROP_BASE; its origin must match CRABCROP_BASE.
- `path` (string, required): Remainder of the cached URL, e.g. "300x200/https://example.com/a.jpg".
- `secret` (string): Signing secret. Defaults to CRABCROP_SECRET. Sensitive, deprecated: prefer the CRABCROP_SECRET environment variable; a per-call secret is kept in client transcripts.

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/crabcrop-crabcrop/crabcrop-mcp#diagnostics

## Score history

- 2026-11-05: 64
- 2026-11-04: 63
- 2026-11-03: 63
- 2026-11-02: 62
- 2026-11-01: 62
- 2026-10-31: 61
- 2026-10-30: 61
- 2026-10-29: 60
- 2026-10-28: 60
- 2026-10-27: 60
- 2026-10-26: 58
- 2026-10-25: 43

## Common questions

### What is the io.github.crabcrop/crabcrop MCP server?

io.github.crabcrop/crabcrop is an MCP server listed in the public MCP registry as io.github.crabcrop/crabcrop. Sign and explain crabcrop image URLs, fetch processed-image metadata, and purge cached results. This page covers its npm package (@crabcrop/mcp).

### Is the io.github.crabcrop/crabcrop MCP server safe to use?

io.github.crabcrop/crabcrop scores 64 out of 100 on VerifyMCP. It declares no install or post-install scripts. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the io.github.crabcrop/crabcrop MCP server expose?

io.github.crabcrop/crabcrop exposes 4 tools: sign_url, explain_url, fetch_meta, purge_result. Their descriptions and schemas cost roughly 649 tokens of context every time the server is loaded.

### Is the io.github.crabcrop/crabcrop MCP server still maintained?

io.github.crabcrop/crabcrop is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the io.github.crabcrop/crabcrop MCP server under?

io.github.crabcrop/crabcrop declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- npm package: https://www.npmjs.com/package/@crabcrop/mcp
- Socket report: https://socket.dev/npm/package/@crabcrop/mcp
- Repository: https://github.com/dayvson/crabcrop
- Changelog RSS feed: https://verifymcp.io/servers/crabcrop-crabcrop/crabcrop-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/crabcrop-crabcrop/crabcrop-mcp.json
- HTML version of this page: https://verifymcp.io/servers/crabcrop-crabcrop/crabcrop-mcp