# groundhog.markets (remote · groundhog.markets)

groundhog.markets: free weather forecasts in one call, plus Kalshi and Polymarket market rules.

- Trust score: 73/100 (medium)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `groundhog.markets`: 73/100 (this document), [markdown](https://verifymcp.io/servers/markets-groundhog-weather/groundhog.md), [page](https://verifymcp.io/servers/markets-groundhog-weather/groundhog)

## Channel facts

- Endpoint: `https://groundhog.markets/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.2.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, 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.

- **Endpoint Security**: 80/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Nothing on it is marked destructive, but we can't show that an anonymous caller can only read: full credit needs the server to list at least one tool and every tool to be verifiably read-only. We use a best-effort check of tool names and descriptions to tell read-only tools from tools that change things, so some genuinely read-only tools may not get full credit. Names that start with a read verb (get, list, read, search and similar) and accurate readOnlyHint annotations help. Meet that to earn full credit, or require authorisation.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 53/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 1384 tokens (~173/item across 8 items; 8 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**: 94/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 82% 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 8 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 9 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 groundhog.markets MCP server?

groundhog.markets is a hosted endpoint at https://groundhog.markets/mcp, so there is nothing to install locally. 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 --transport http markets-groundhog-weather 'https://groundhog.markets/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "markets-groundhog-weather": {
      "url": "https://groundhog.markets/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "markets-groundhog-weather": {
      "type": "http",
      "url": "https://groundhog.markets/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.markets-groundhog-weather]
url = "https://groundhog.markets/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "markets-groundhog-weather": {
      "type": "remote",
      "url": "https://groundhog.markets/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add markets-groundhog-weather --url 'https://groundhog.markets/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  markets-groundhog-weather:
    url: "https://groundhog.markets/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "markets-groundhog-weather": {
      "Transport": "http",
      "Url": "https://groundhog.markets/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add markets-groundhog-weather -t streamable-http -u 'https://groundhog.markets/mcp'
```

### Other

```json
{
  "mcpServers": {
    "markets-groundhog-weather": {
      "type": "http",
      "url": "https://groundhog.markets/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## 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 73, +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 72, +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 71, +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 70, +1)

- [security] Tool “markets” rewrote its description, which is the text the model reads

### 2026-10-29 (score 69, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-28 (score 69)

First indexed and scored.

## MCP tools (8)

### `forecast` (~467 tokens)

Forecast blend

Daily high/low for any place from every free forecast: median, spread, rain, current obs and active alerts, with credits and the page URL. line ≈321 tok, week ≈566, table ≈1,567, series ≈1,564. Keep the credits and link the page when you repeat numbers. size=runs: one place, each source's newest runs by day with run_utc and fetched_at; NBM adds XND, P12, Q12. variable=rain: members' share of 0.01 in or more and heavier (n = model families), NBM calibrated, amounts by source, so far today, month to date; rain line ≈647 tok, table ≈1,955.

Input parameters:

- `all` (boolean): table: also twin and stale rows
- `credits` (string)
- `date` (string): today | tomorrow | +N (0-7) | YYYY-MM-DD, each place's local date. Default: today before 15:00 local, else tomorrow.
- `days` (integer): week/table days (default 7)
- `format` (string): line md, others tsv
- `hours` (integer): series hours (72)
- `include_6h` (boolean): temp only: also count 6-hourly (~) days
- `place` (required): Slug, name, 'City, ST', 'City, Country', ICAO or 'lat,lon'. An array (up to 10) for line/week.
- `runs` (integer): size=runs: newest runs per source (1)
- `size` (string): default line; runs = each source's newest runs by day (trading fields)
- `step` (integer): series step hours (temp 3, rain 6)
- `stn` (string): rain: a settle station of the place, e.g. KORD
- `units` (string): default F in the US, else C; rain in inches with F, mm with C
- `variable` (string): temp (default) or rain
- `win` (string): rain: lst = the climate day at a daily-rain settle station, cal = calendar day

### `places` (~46 tokens)

Find a place

Find a place slug by name, City, ST, airport code or lat,lon; says full blend or grid only.

Input parameters:

- `limit` (integer)
- `q` (string, required)

### `sources` (~22 tokens)

Sources

Open sources groundhog uses: licence, latest run, age, status.

### `markets` (~206 tokens)

Weather markets

Weather markets in a place (Kalshi, Polymarket high/low/rain): settlement station and rule, the number so far under that rule, our value and the official result once settled, forecast daily max/min at the station. No prices. Needs place or family. line ≈526 tok, table ≈1,757; every city ≈36,291. With neither: the list of market cities.

Input parameters:

- `credits` (string)
- `date` (string): today | tomorrow | yesterday | YYYY-MM-DD, each place's local date (default today)
- `family` (string): high | low | rain | all (default all); alone: every market city
- `format` (string): line md, table tsv
- `place`: Slug, name, 'City, ST' or ICAO; an array for up to 10 places
- `size` (string): line (default with place) | table (default without)

### `receipts` (~61 tokens)

Market receipts

How often our settle value matched the venue's result, with every miss. No prices.

Input parameters:

- `days` (integer): last N days (30)
- `family` (string)
- `format` (string): default tsv
- `venue` (string)

### `search` (~50 tokens)

Search places

Search places by name, City, ST, airport code or lat,lon. Returns {results: [{id, title, url, text}]}; pass an id to fetch.

Input parameters:

- `query` (string, required)

### `fetch` (~49 tokens)

Fetch a place

The 7-day forecast of a place id from search: {id, title, text, url, metadata}. Keep the credits and link the url when you repeat numbers.

Input parameters:

- `id` (string, required)

### `history` (~414 tokens)

As-issued history

As-issued history for backtests (no look-ahead): kind=daily (every source's daily hi/lo/rain per run at a place), nbm (NBM text columns: TXN, XND, P12, Q12; view=day = the books' day view) or obs (settlement truth: CLI, routine-METAR max/min). from/to (<= 366 days, 1 unit per 31 days); run=ISO | lead=N (+cycle=H: the run issued N days before) | asof=ISO (what was known then). Rows carry fetched_at and origin (bf:* = backfilled). TSV by default.

Input parameters:

- `asof` (string): newest run fetched by this UTC time (no look-ahead)
- `cycle` (integer): with lead: only runs at H UTC
- `els` (string): kind=nbm: elements, comma list (TXN,XND,P12,Q12,TMP)
- `format` (string): tsv (default) | json
- `from` (string, required): first target date YYYY-MM-DD
- `kind` (string): daily (default) | nbm | obs
- `lead` (integer): the run issued N UTC days before each date
- `place` (string): slug, name or ICAO (kind=daily; nbm/obs: its station)
- `prod` (string): kind=nbm: nbe (default) | nbs
- `product` (string): kind=obs
- `run` (string): one run, YYYY-MM-DDTHH:MMZ
- `source` (string): kind=daily: source ids, comma list (e.g. nbm,gfs,ifs)
- `stn` (string): ICAO (kind=nbm, obs)
- `to` (string): last target date (default from)
- `view` (string): kind=nbm: raw (default) | day

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/markets-groundhog-weather/groundhog#diagnostics

## Score history

- 2026-11-05: 73
- 2026-11-04: 72
- 2026-11-03: 72
- 2026-11-02: 71
- 2026-11-01: 71
- 2026-10-31: 70
- 2026-10-30: 70
- 2026-10-29: 69
- 2026-10-28: 69

## Common questions

### What is the groundhog.markets MCP server?

groundhog.markets is an MCP server listed in the public MCP registry as markets.groundhog/weather. groundhog.markets: free weather forecasts in one call, plus Kalshi and Polymarket market rules. This page covers its hosted endpoint (https://groundhog.markets/mcp).

### Is the groundhog.markets MCP server safe to use?

groundhog.markets scores 73 out of 100 on VerifyMCP. 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 groundhog.markets MCP server expose?

groundhog.markets exposes 8 tools: forecast, places, sources, markets, receipts, and 3 more. Their descriptions and schemas cost roughly 1,315 tokens of context every time the server is loaded.

### Does the groundhog.markets MCP server require authentication?

No. We connected to groundhog.markets without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the groundhog.markets MCP server still maintained?

groundhog.markets 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 did VerifyMCP test on the groundhog.markets MCP server?

VerifyMCP ran 13 checks on groundhog.markets, covering TLS certificate, Authorization, HTTPS, HSTS header and 9 more. Supply Chain Security and Provenance & Transparency do not apply to a hosted endpoint, so they were not tested. The score does not measure everything, and the scoring documentation lists what it leaves out.

## Links

- Remote endpoint: https://groundhog.markets/mcp
- Website: https://groundhog.markets/agents?ref=mcp-registry
- Changelog RSS feed: https://verifymcp.io/servers/markets-groundhog-weather/groundhog.xml
- Changelog JSON feed: https://verifymcp.io/servers/markets-groundhog-weather/groundhog/changelog.json
- Trust report (JSON): https://verifymcp.io/servers/markets-groundhog-weather/groundhog.json
- HTML version of this page: https://verifymcp.io/servers/markets-groundhog-weather/groundhog