# Grassy Knees (npm · grassyknees-mcp)

Real, source-checked kids' events and places in 42 US metros, linked to grassyknees.com.

- Trust score: 67/100 (medium)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- npm · `grassyknees-mcp`: 67/100 (this document), [markdown](https://verifymcp.io/servers/grassyknees-grassyknees-mcp/grassyknees-mcp.md), [page](https://verifymcp.io/servers/grassyknees-grassyknees-mcp/grassyknees-mcp)

## Channel facts

- Registry: `npm`
- Package: `grassyknees-mcp`
- Version: `0.2.0`
- 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**: 81/100
  - No malware found by supply-chain analysis.
  - CVE check failed: a known high-severity CVE affects zod 3.25.76, a direct dependency. A fixed version is available.
  - No install/post-install scripts declared.
  - 30 of 93 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 45/100
  - 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 7 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 66/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 687 tokens (~171/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**: 27/100
  - Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 95/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 86% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 5 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 Grassy Knees MCP server?

Grassy Knees runs locally as an npm package, launched with npx -y grassyknees-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 grassyknees-grassyknees-mcp -- npx -y grassyknees-mcp
```

### Cursor

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

### VS Code

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

### Codex

```bash
codex mcp add grassyknees-grassyknees-mcp -- npx -y grassyknees-mcp
```

### opencode

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

### OpenClaw

```bash
openclaw mcp add grassyknees-grassyknees-mcp --command npx --arg -y --arg grassyknees-mcp
```

### Hermes

```yaml
mcp_servers:
  grassyknees-grassyknees-mcp:
    command: "npx"
    args: ["-y", "grassyknees-mcp"]
```

### Netclaw

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

### Vellum

```bash
assistant mcp add grassyknees-grassyknees-mcp -t stdio -c npx -a -y grassyknees-mcp
```

### Other

```json
{
  "mcpServers": {
    "grassyknees-grassyknees-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "grassyknees-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 67, +1)

No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-03 (score 66, +1)

No change was recorded against any check on this day. Stability & Change Management went from 17 to 20. That category is still filling its 30-day observation window: 5 days of observed history at the previous scan, 6 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-01 (score 65, +1)

No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-30 (score 64, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-29 (score 63, 0)

- [security regression] Stability: 0.00 → unverified
- [security regression] Tool safety: pass → unverified
- [functional regression] Capabilities: pass → unverified
- [functional regression] Tool coverage: 100 → unverified
- [functional] First check of Schema quality: unverified
- [functional] Package version: 0.1.0 → 0.2.0

### 2026-10-28 (score 63)

First indexed and scored.

## MCP tools (4)

### `list_metros` (~39 tokens)

List covered metro areas

List the 42 US metro areas Grassy Knees covers, with the metro id to pass to the other tools and each metro's page URLs.

### `search_activities` (~334 tokens)

Search kids' activities in a metro

Find kids' and family events, classes/programs and places in one Grassy Knees metro area, filtered by date, price, age, category and keywords. Returns at most 20 listings, soonest first, each with its grassyknees.com page URL. Dates are in the metro's local time.

Input parameters:

- `age` (integer): Child's age in years; keeps listings whose published age range includes it (listings without an age range are kept).
- `category` (string)
- `end_date`: End of the custom range, YYYY-MM-DD. Defaults to start_date.
- `free_only` (boolean): Only free listings.
- `kind` (string): event = dated one-offs (default); program = classes and multi-week series; place = museums, parks, rinks and other places to go; any = all three.
- `limit` (integer): How many listings to return, 1–20 (default 10).
- `metro` (string, required): Metro id from list_metros (e.g. denver, new-york, washington-dc, dallas-fort-worth). Common names like 'NYC' or 'Dallas' also work.
- `query` (string): Keywords matched against title, description, venue, organizer and address (all words must match), e.g. 'pumpkin', 'library storytime', 'Boulder'.
- `start_date` (string): Start of a custom date range, YYYY-MM-DD (metro local time).
- `when` (string): Date window. Default next-7-days. Ignored when start_date is given.

### `get_activity` (~104 tokens)

Get one listing

Details for one Grassy Knees listing: schedule and upcoming dates, venue, ages and its grassyknees.com page (price, availability, registration and organizer links are there). Pass the grassyknees.com listing URL or the listing id (listing-…) from search_activities.

Input parameters:

- `url_or_id` (string, required): A grassyknees.com listing URL such as https://grassyknees.com/denver/activities/<slug>--listing-…, or its id.

### `seasonal_guide` (~115 tokens)

Seasonal guide

Grassy Knees' seasonal guide (Halloween events, Christmas lights and holiday events, ice skating rinks, Easter egg hunts) for one metro, or the national overview when metro is omitted. Returns the page's Markdown (quick answers plus listings with links), trimmed to max_chars.

Input parameters:

- `max_chars` (integer): Trim the Markdown to this many characters (default 8000).
- `metro` (string): Metro id from list_metros. Omit for the all-metros overview.
- `season` (string, required)

## Diagnostics

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

## Score history

- 2026-11-05: 67
- 2026-11-04: 66
- 2026-11-03: 66
- 2026-11-02: 65
- 2026-11-01: 65
- 2026-10-31: 64
- 2026-10-30: 64
- 2026-10-29: 63
- 2026-10-28: 63

## Common questions

### What is the Grassy Knees MCP server?

Grassy Knees is an MCP server listed in the public MCP registry as io.github.grassyknees/grassyknees-mcp. Real, source-checked kids' events and places in 42 US metros, linked to grassyknees.com. This page covers its npm package (grassyknees-mcp).

### Is the Grassy Knees MCP server safe to use?

Grassy Knees scores 67 out of 100 on VerifyMCP. We recorded 1 known advisory against it as of 5 November 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 Grassy Knees MCP server expose?

Grassy Knees exposes 4 tools: list_metros, search_activities, get_activity, seasonal_guide. Their descriptions and schemas cost roughly 592 tokens of context every time the server is loaded.

### Is the Grassy Knees MCP server still maintained?

Grassy Knees 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 Grassy Knees MCP server under?

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

### What did VerifyMCP test on the Grassy Knees MCP server?

VerifyMCP ran 16 checks on Grassy Knees, covering Malware scan, Known CVEs, Install scripts, Dependency health and 12 more. Endpoint Security and Transport & Reachability do not apply to an npm package, so they were not tested. The score does not measure everything, and the scoring documentation lists what it leaves out.

## Links

- npm package: https://www.npmjs.com/package/grassyknees-mcp
- Socket report: https://socket.dev/npm/package/grassyknees-mcp
- Repository: https://github.com/grassyknees/grassyknees-mcp
- Website: https://grassyknees.com/
- Changelog RSS feed: https://verifymcp.io/servers/grassyknees-grassyknees-mcp/grassyknees-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/grassyknees-grassyknees-mcp/grassyknees-mcp/changelog.json
- Trust report (JSON): https://verifymcp.io/servers/grassyknees-grassyknees-mcp/grassyknees-mcp.json
- HTML version of this page: https://verifymcp.io/servers/grassyknees-grassyknees-mcp/grassyknees-mcp