# GribStream MCP (remote · gribstream.com)

Hosted weather data MCP for discovery, validation, and OAuth-protected GribStream queries.

- Trust score: 71/100 (medium)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-04

## Components

- remote · `gribstream.com`: 71/100 (this document), [markdown](https://verifymcp.io/servers/com-gribstream-mcp/gribstream.md), [page](https://verifymcp.io/servers/com-gribstream-mcp/gribstream)

## Channel facts

- Endpoint: `https://gribstream.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.1.3`

## 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 2026-08-04.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 10 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - 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**: 81/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 1671 tokens (~139/item across 12 items; 10 tools + 2 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 30/100
  - Stability observed for 9 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.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add --transport http com-gribstream-mcp https://gribstream.com/mcp
```

### Codex

```toml
[mcp_servers.com-gribstream-mcp]
url = "https://gribstream.com/mcp"
```

### opencode

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

### OpenClaw

```bash
openclaw mcp add com-gribstream-mcp --url https://gribstream.com/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-gribstream-mcp:
    url: "https://gribstream.com/mcp"
```

### Other

```json
{
  "mcpServers": {
    "com-gribstream-mcp": {
      "type": "http",
      "url": "https://gribstream.com/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.

### 2026-08-04 (score 71, +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.

### 2026-08-02 (score 70, +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.

### 2026-07-31 (score 69, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-30 (score 69, +1)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-29 (score 68, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-27 (score 67, +1)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-26 (score 66)

First indexed and scored.

## MCP tools (10)

### `gribstream_list_datasets` (~157 tokens)

List GribStream datasets

NO AUTH / PUBLIC / READ-ONLY. Lists public GribStream datasets and metadata. This tool does not query weather values and cannot return forecast data. Supports catalog filters such as code, family, tag, and is_ensemble.

Input parameters:

- `code`: Dataset code or list of dataset codes, for example gfs or ["gfs", "ifsoper"].
- `family` (string): Dataset family filter, for example gfs, ifs, nbm, hrrr, rap, rtma, urma.
- `is_ensemble` (boolean): Filter to ensemble datasets when true, or deterministic datasets when false.
- `tag`: Tag or list of tags. Multiple tags use AND semantics in the API.

Output parameters:

- `datasets` (array): Public GribStream dataset summaries.

### `gribstream_get_dataset` (~83 tokens)

Get dataset metadata

NO AUTH / PUBLIC / READ-ONLY. Gets full public metadata for one dataset code, including archive coverage, cadence, tags, source links, and members. This tool does not query weather values and cannot return forecast data.

Input parameters:

- `dataset` (string, required): Dataset code, for example gfs, nbm, ifsoper, hrrr, urma.

### `gribstream_list_parameters` (~65 tokens)

List dataset parameters

NO AUTH / PUBLIC / READ-ONLY. Lists parameter summaries for one dataset. Use this before selecting exact case-sensitive parameter codes. This tool does not query weather values and cannot return forecast data.

Input parameters:

- `dataset` (string, required): Dataset code, for example ifsoper.

Output parameters:

- `parameters` (array): Parameter summaries for one GribStream dataset.

### `gribstream_get_parameter` (~95 tokens)

Get parameter selectors

NO AUTH / PUBLIC / READ-ONLY. Gets detailed metadata and exact selector variations for one dataset parameter. Parameter codes are case-sensitive. This tool does not query weather values and cannot return forecast data.

Input parameters:

- `dataset` (string, required): Dataset code, for example ifsoper.
- `parameter` (string, required): Exact case-sensitive parameter short name, for example 100u, 2t, TMP, or APCP.

### `gribstream_list_shared_parameters` (~88 tokens)

List shared weather parameters

NO AUTH / PUBLIC / READ-ONLY. Lists normalized shared parameter presets that can map one logical signal across datasets. This tool does not query weather values and cannot return forecast data.

Input parameters:

- `dataset`: Optional dataset code or list of dataset codes to filter supported shared parameters.
- `dataset_mode` (string): Whether every listed dataset must support the preset or any one may support it.

Output parameters:

- `shared_parameters` (array): Shared weather parameter summaries.

### `gribstream_resolve_shared_parameter` (~133 tokens)

Resolve shared weather parameter

NO AUTH / PUBLIC / READ-ONLY. Resolves one shared parameter preset for a dataset, returning native variables and expressions to use in /timeseries or /runs request bodies. This tool does not execute the request, query weather values, or return forecast data.

Input parameters:

- `alias` (string): Optional output alias for the resolved request.
- `dataset` (string): Optional dataset code to resolve the shared parameter against.
- `parameter` (string, required): Shared parameter code, for example temperature_2m, wind_speed_10m, mean_sea_level_pressure, or wind_speed_500hpa.

### `gribstream_get_expression_reference` (~69 tokens)

Get expression reference

NO AUTH / PUBLIC / READ-ONLY. Gets the GribStream expression language reference, including github.com/expr-lang/expr syntax guidance, alias rules, examples, and the full exported func.* math function list. This tool does not query weather values and cannot return forecast data.

### `gribstream_build_timeseries_request` (~282 tokens)

Build timeseries API request

NO AUTH / PUBLIC / READ-ONLY. Builds and validates a copy-pasteable authenticated /api/v2/{dataset}/timeseries HTTP request without sending it. This tool does not execute the request, query weather values, or return forecast data. Use gribstream_query_timeseries when the user asks for actual weather values or CSV/JSON/NDJSON data. Generated direct API requests include Accept-Encoding: gzip, and generated curl commands use --compressed so large responses can be transferred compressed when the client supports it. Do not include request.asOf unless the user explicitly wants backtesting, time travel, or a historical model-run cutoff. The request body must use exact selectors discovered from the catalog or shared-parameter tools, with coordinates in request.coordinates and selectors in request.variables.

Input parameters:

- `accept` (string): Desired response format for the eventual HTTP request.
- `dataset` (string, required): Dataset code, for example gfs, ifsoper, nbm, hrrr, or urma.
- `request` (object, required): Timeseries request body. Use either timesList or fromTime+untilTime as UTC valid times. Omit asOf unless the user explicitly asks for backtesting, time travel, what was known then, or a historical mo…

Output parameters:

- `body` (object): GribStream API request body.
- `curl` (string): Copy-pasteable curl command.
- `endpoint` (string): GribStream endpoint.
- `errors` (array): Validation errors.
- `headers` (object): HTTP headers for the generated request. Includes Accept-Encoding: gzip so large direct API responses can be transferred compressed when the client supports decompression.
- `method` (string): HTTP method for the generated request.
- `timestamp_semantics` (string): Endpoint-specific timestamp guidance.
- `url` (string): Public GribStream API URL.
- `valid` (boolean): Whether the request body passed local shape, selector, and expression checks.
- `warnings` (array): Validation warnings.

### `gribstream_build_runs_request` (~231 tokens)

Build runs API request

NO AUTH / PUBLIC / READ-ONLY. Builds and validates a copy-pasteable authenticated /api/v2/{dataset}/runs HTTP request without sending it. This tool does not execute the request, query weather values, or return forecast data. Use gribstream_query_runs when the user asks for actual model-run forecast data or CSV/JSON/NDJSON data. Generated direct API requests include Accept-Encoding: gzip, and generated curl commands use --compressed so large responses can be transferred compressed when the client supports it. The request body must use exact selectors discovered from the catalog or shared-parameter tools, with coordinates in request.coordinates and selectors in request.variables.

Input parameters:

- `accept` (string): Desired response format for the eventual HTTP request.
- `dataset` (string, required): Dataset code, for example gfs, ifsoper, nbm, hrrr, or urma.
- `request` (object, required): Runs request body. Use either timesList or forecastedFrom+forecastedUntil as UTC model run times. Coordinates must be in request.coordinates, and variable selectors must be in request.variables.

Output parameters:

- `body` (object): GribStream API request body.
- `curl` (string): Copy-pasteable curl command.
- `endpoint` (string): GribStream endpoint.
- `errors` (array): Validation errors.
- `headers` (object): HTTP headers for the generated request. Includes Accept-Encoding: gzip so large direct API responses can be transferred compressed when the client supports decompression.
- `method` (string): HTTP method for the generated request.
- `timestamp_semantics` (string): Endpoint-specific timestamp guidance.
- `url` (string): Public GribStream API URL.
- `valid` (boolean): Whether the request body passed local shape, selector, and expression checks.
- `warnings` (array): Validation warnings.

### `gribstream_validate_request` (~181 tokens)

Validate API request

NO AUTH / PUBLIC / READ-ONLY. Validates the basic shape, exact selector tuples, and expression syntax of a proposed GribStream /timeseries or /runs request without sending it. This tool does not execute the request, query weather values, or return forecast data. Use this before returning any hand-edited curl or when changing a request from one dataset to another.

Input parameters:

- `dataset` (string, required): Dataset code, for example gfs, ifsoper, nbm, hrrr, or urma.
- `endpoint` (string, required): Endpoint to validate.
- `request` (object, required): Request body to validate. Omit asOf unless the user explicitly asks for backtesting, time travel, what was known then, or a historical model-run cutoff for /timeseries. Use request.coordinates for po…

Output parameters:

- `dataset` (string): Dataset code that was validated.
- `endpoint` (string): GribStream endpoint.
- `errors` (array): Validation errors.
- `timestamp_semantics` (string): Endpoint-specific timestamp guidance.
- `valid` (boolean): Whether the request body passed local shape, selector, and expression checks.
- `warnings` (array): Validation warnings.

## Diagnostics

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

## Score history

- 2026-08-04: 71
- 2026-08-03: 70
- 2026-08-02: 70
- 2026-08-01: 69
- 2026-07-31: 69
- 2026-07-30: 69
- 2026-07-29: 68
- 2026-07-28: 67
- 2026-07-27: 67
- 2026-07-26: 66

## Links

- Remote endpoint: https://gribstream.com/mcp
- Repository: https://github.com/GribStream/gribstream-mcp
- Website: https://gribstream.com/
- Changelog RSS feed: https://verifymcp.io/servers/com-gribstream-mcp/gribstream/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-gribstream-mcp/gribstream/changelog.json
- HTML version of this page: https://verifymcp.io/servers/com-gribstream-mcp/gribstream