# io.github.Jonahbkerr/yocoolab (npm · @yocoolab/mcp-server)

Pin visual feedback on any live web page and send it to Claude Code, Cursor or your AI agent.

- Trust score: 72/100 (medium)
- Change this week: +6
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-20

## Components

- npm · `@yocoolab/mcp-server`: 72/100 (this document), [markdown](https://verifymcp.io/servers/jonahbkerr-yocoolab/yocoolab-mcp-server.md), [page](https://verifymcp.io/servers/jonahbkerr-yocoolab/yocoolab-mcp-server)

## Channel facts

- Registry: `npm`
- Package: `@yocoolab/mcp-server`
- Version: `2.4.3`
- 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 2026-09-20.

- **Supply Chain Security**: 80/100
  - No malware found by supply-chain analysis.
  - CVE check failed: a known high-severity CVE affects uuid 9.0.1, a direct dependency. A fixed version is available.
  - No install/post-install scripts declared.
  - 32 of 97 dependencies flagged as unhealthy (1 deprecated).
- **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 (Apache-2.0).
  - Actively maintained (last published 12 days ago).
  - Publishes a security disclosure policy (SECURITY.md).
- **Schema Quality & AI Usability**: 86/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 599 tokens (~59/item across 10 items; 10 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 43/100
  - Stability observed for 13 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; "reply_to_companion" implies "send" and declares no destructiveHint at all, which the MCP spec reads as destructive by default.
  - An AI judge read all 10 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

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

io.github.Jonahbkerr/yocoolab runs locally as an npm package, launched with npx -y @yocoolab/mcp-server. 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 jonahbkerr-yocoolab -- npx -y @yocoolab/mcp-server
```

### Cursor

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

### VS Code

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

### Codex

```bash
codex mcp add jonahbkerr-yocoolab -- npx -y @yocoolab/mcp-server
```

### opencode

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

### OpenClaw

```bash
openclaw mcp add jonahbkerr-yocoolab --command npx --arg -y --arg @yocoolab/mcp-server
```

### Hermes

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

### Netclaw

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

### Vellum

```bash
assistant mcp add jonahbkerr-yocoolab -t stdio -c npx -a -y @yocoolab/mcp-server
```

### Other

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

## 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.

### 2026-09-20 (score 72, +1)

No change was recorded against any check on this day. Stability & Change Management went from 40 to 43. That category is still filling its 30-day observation window: 12 days of observed history at the previous scan, 13 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-18 (score 71, +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.

### 2026-09-16 (score 70, +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.

### 2026-09-15 (score 69, +3)

- [functional improvement] Stability: unverified → 0.27

### 2026-09-08 (score 66, +15)

- [security improvement] Malware scan: unverified → pass

### 2026-09-07 (score 51)

First indexed and scored.

## MCP tools (10)

### `get_companion_messages` (~49 tokens)

Check for new messages from the AI Companion panel in the Chrome extension. Returns pending messages and clears the queue. Each message includes the user text, page context, and optional screenshot/element attachments.

### `reply_to_companion` (~61 tokens)

Send a reply back to the AI Companion panel in the Chrome extension. The reply will appear as an assistant message in the companion chat UI. Supports Markdown formatting.

Input parameters:

- `message` (string, required): The reply message to display in the companion panel (supports Markdown)

### `get_latest_selection` (~40 tokens)

Returns the most recent element selection from the Chrome extension. Includes element selector, tag, text content, classes, attributes, computed styles, and page context.

### `get_selection_history` (~49 tokens)

Returns the last N element selections from the Chrome extension, newest first. Useful for comparing multiple elements or reviewing recent selections.

Input parameters:

- `limit` (number): Number of selections to return (max 50)

### `find_source_for_selection` (~103 tokens)

Searches the workspace for source files that likely define or render the selected UI element. Returns ranked candidates with file paths, line ranges, confidence scores, and match reasons. Can work with live Chrome selections or stored thread element_context.

Input parameters:

- `correlationId` (string): The correlationId of a specific selection. If omitted, uses the latest selection.
- `thread_id` (string): A Yocoolab thread ID to use stored element_context instead of a live selection.

### `get_element_context` (~130 tokens)

Returns a comprehensive summary of a UI element, including its DOM context, computed styles, and ranked source code candidates. Works with live Chrome selections or stored thread element_context. This is the primary tool to use when the user wants to modify a UI element.

Input parameters:

- `correlationId` (string): The correlationId of a specific selection. If omitted, uses the latest selection.
- `includePrompt` (boolean): Whether to include a pre-built edit prompt with constraints (default: true).
- `thread_id` (string): A Yocoolab thread ID to use stored element_context instead of a live selection.

### `get_activity_summary` (~36 tokens)

Get a high-level summary of Claude Code activity: total events, active sessions, tool usage breakdown, files touched, and error count.

### `get_recent_events` (~58 tokens)

Get the most recent Claude Code activity events (tool calls, prompts, errors). Shows timestamps, tool names, and key details.

Input parameters:

- `limit` (number): Number of recent events to return (default: 10, max: 50)

### `get_files_touched` (~34 tokens)

List all files that have been read, written, or edited across Claude Code sessions. Shows file paths with session counts.

### `get_dashboard_url` (~39 tokens)

Get the URL for the real-time activity monitoring dashboard. Open in a browser to see live Claude Code activity, tool usage charts, and session timelines.

## Diagnostics

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

## Score history

- 2026-09-20: 72
- 2026-09-19: 71
- 2026-09-18: 71
- 2026-09-17: 70
- 2026-09-16: 70
- 2026-09-15: 69
- 2026-09-14: 66
- 2026-09-13: 66
- 2026-09-12: 66
- 2026-09-11: 66
- 2026-09-10: 66
- 2026-09-09: 66
- 2026-09-08: 66
- 2026-09-07: 51

## Common questions

### What is the io.github.Jonahbkerr/yocoolab MCP server?

io.github.Jonahbkerr/yocoolab is an MCP server listed in the public MCP registry as io.github.Jonahbkerr/yocoolab. Pin visual feedback on any live web page and send it to Claude Code, Cursor or your AI agent. This page covers its npm package (@yocoolab/mcp-server).

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

io.github.Jonahbkerr/yocoolab scores 72 out of 100 on VerifyMCP. We recorded 1 known advisory against it as of 20 September 2026. 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.Jonahbkerr/yocoolab MCP server expose?

io.github.Jonahbkerr/yocoolab exposes 10 tools: get_companion_messages, reply_to_companion, get_latest_selection, get_selection_history, find_source_for_selection, and 5 more. Their descriptions and schemas cost roughly 599 tokens of context every time the server is loaded.

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

io.github.Jonahbkerr/yocoolab is still listed as active in the MCP registry. We last reached this channel on 20 September 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.Jonahbkerr/yocoolab MCP server under?

io.github.Jonahbkerr/yocoolab declares the Apache-2.0 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/@yocoolab/mcp-server
- Socket report: https://socket.dev/npm/package/@yocoolab/mcp-server
- Repository: https://github.com/Yocoolab/mcp-server
- Changelog RSS feed: https://verifymcp.io/servers/jonahbkerr-yocoolab/yocoolab-mcp-server.xml
- Changelog JSON feed: https://verifymcp.io/servers/jonahbkerr-yocoolab/yocoolab-mcp-server.json
- HTML version of this page: https://verifymcp.io/servers/jonahbkerr-yocoolab/yocoolab-mcp-server