Grassy Knees
NPM · GRASSYKNEES-MCP
Real, source-checked kids' events and places in 42 US metros, linked to grassyknees.com.
Available components
Last scanned (11 hours ago)
Scores higher than 35% of npm servers
Category Entertainment and Games
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. How we score → Why this is hard to score →
Supply Chain Security81
- No malware found by supply-chain analysis.Pass
- CVE check failed: a known high-severity CVE affects zod 3.25.76, a direct dependency. A fixed version is available. View diagnostics → Fail
- No install/post-install scripts declared.Pass
- 30 of 93 dependencies flagged as unhealthy. View diagnostics → Partial
Provenance & Transparency45
- Source repository is publicly reachable at the declared URL. View diagnostics → Pass
- Provenance check failed: no build-provenance attestation is published. See how to fix → View diagnostics → Fail
- Clear OSI-approved license (MIT).Pass
- Actively maintained (last published 7 days ago).Pass
- Disclosure check failed: no security disclosure policy was found in the source repository. See how to fix → Fail
Schema Quality & AI Usability66
- AI-judged instruction clarity (good).Pass
- 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. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management27
- Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage95
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 86% of tool parameters carry a description.Partial
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 5 Nov 26 +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.
- 3 Nov 26 +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.
- 1 Nov 26 +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.
- 30 Oct 26 +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.
- 29 Oct 26 0
- Stability: 0.00 → unverified ▼ security
- Tool safety: pass → unverified ▼ security
- Capabilities: pass → unverified ▼ functional
- Tool coverage: 100 → unverified ▼ functional
- First check of Schema quality: unverified functional
- Package version: 0.1.0 → 0.2.0 functional
- 28 Oct 26 63
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 5 Nov 2026 · Analysed npm/grassyknees-mcp@0.2.0
Provenance No attestation
The registry publishes no build provenance for this version, so there is nothing to verify.
| Result | No attestation |
|---|---|
| Ecosystem | npm |
Background: How many MCP packages publish verified provenance →
Vulnerabilities 1 finding
| ID | CVE | Severity | Vector | Fix available |
|---|---|---|---|---|
| GHSA-mrhx-c7xc-m3w5 | CVE-2023-54404 | high | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | yes |
Background: What a vulnerability scan can and cannot prove →
Dependencies 93 packages
| Packages resolved | 93 |
|---|---|
| Stale | 30 |
| Tree resolution | Complete |
Background: SBOMs and build attestations, explained →
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
get_activity Get one listing ~104
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.
| Name | Type | Req | Description |
|---|---|---|---|
| url_or_id | string | yes | A grassyknees.com listing URL such as https://grassyknees.com/denver/activities/<slug>--listing-…, or its id. |
No output schema declared.
No examples provided.
list_metros List covered metro areas ~39
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.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
search_activities Search kids' activities in a metro ~334
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | yes | 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. |
No output schema declared.
No examples provided.
seasonal_guide Seasonal guide ~115
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | yes | – |
No output schema declared.
No examples provided.
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.
npm · grassyknees-mcp
claude mcp add grassyknees-grassyknees-mcp -- npx -y grassyknees-mcp
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.