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open-meteo-mcp-server

by io.github.cyanheads
OverviewDiscussionsAdmin

Openmeteo Dataframe Describe

openmeteo_dataframe_describe
Read-onlyIdempotent

List the tables and their columns on a DataCanvas staged by openmeteo_get_forecast, openmeteo_get_historical, openmeteo_get_marine, openmeteo_get_air_quality, openmeteo_get_ensemble, openmeteo_get_flood, or openmeteo_get_climate. Call this first to discover table names before querying with openmeteo_dataframe_query.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "canvas_id": "<canvas_id>"
    },
    "name": "openmeteo_dataframe_describe"
  }
}

Input Schema

NameRequiredDescriptionDefault
canvas_idYesCanvas ID returned by openmeteo_get_forecast, openmeteo_get_historical, openmeteo_get_marine, openmeteo_get_air_quality, openmeteo_get_ensemble, openmeteo_get_flood, or openmeteo_get_climate when truncated: true.

Output Schema

NameRequiredDescriptionDefault
errorNoPresent when the call failed. Absent on success.
tablesNoTables and views registered on this canvas.
canvas_idNoCanvas ID that was inspected.
expires_atNoISO 8601 expiry after the sliding 24 h TTL.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedOutput schema / properties / error / properties / data / properties / reason / description
      Previous value: -"Machine-readable failure mode. Declared by this tool: `canvas_not_enabled`: CANVAS_PROVIDER_TYPE is not set to duckdb. `canvas_not_found`: The canvas_id is unknown or has expired (TTL is 24 h sliding). Other values are possible when a failure originates below the handler."New value: +"Machine-readable failure mode. Declared by this tool: `canvas_not_enabled`: CANVAS_PROVIDER_TYPE is not set to duckdb. `canvas_not_found`: The canvas_id is unknown or has expired under its 24 h sliding TTL. Other values are possible when a failure originates below the handler."
  2. Changed2 schema fields changed
    • addedInput schema / properties / canvas_id / pattern
      Added value: +"^[A-Za-z0-9_-]{10}$"
    • changedOutput schema / properties / error / properties / data / properties / reason / description
      Previous value: -"Machine-readable failure mode. Declared by this tool: `canvas_not_enabled`: CANVAS_PROVIDER_TYPE is not set to duckdb `canvas_not_found`: The canvas_id is unknown or has expired (TTL is 24 h sliding) Other values are possible when a failure originates below the handler."New value: +"Machine-readable failure mode. Declared by this tool: `canvas_not_enabled`: CANVAS_PROVIDER_TYPE is not set to duckdb. `canvas_not_found`: The canvas_id is unknown or has expired (TTL is 24 h sliding). Other values are possible when a failure originates below the handler."
  3. Changed6 schema fields changed
    • changedInput schema / $schema
      Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"
    • addedInput schema / additionalProperties
      Added value: +false
    • changedOutput schema / $schema
      Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"
    • addedOutput schema / anyOf
      Added value: +[
+  {
+    "not": {
+      "required": [
+        "error"
+      ]
+    },
+    "required": [
+      "canvas_id",
+      "tables",
+      "expires_at"
+    ]
+  },
+  {
+    "required": [
+      "error"
+    ]
+  }
+]
    • addedOutput schema / properties / error
      Added value: +{
+  "additionalProperties": {},
+  "description": "Present when the call failed. Absent on success.",
+  "properties": {
+    "code": {
+      "description": "JSON-RPC error code for this failure.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    },
+    "data": {
+      "additionalProperties": {},
+      "properties": {
+        "reason": {
+          "description": "Machine-readable failure mode. Declared by this tool: `canvas_not_enabled`: CANVAS_PROVIDER_TYPE is not set to duckdb `canvas_not_found`: The canvas_id is unknown or has expired (TTL is 24 h sliding) Other values are possible when a failure originates below the handler.",
+          "examples": [
+            "canvas_not_enabled",
+            "canvas_not_found"
+          ],
+          "type": "string"
+        },
+        "recovery": {
+          "additionalProperties": {},
+          "description": "Actionable next step for the caller.",
+          "properties": {
+            "hint": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "hint"
+          ],
+          "type": "object"
+        },
+        "retryable": {
+          "description": "Whether retrying may succeed.",
+          "type": "boolean"
+        }
+      },
+      "type": "object"
+    },
+    "message": {
+      "description": "Human-readable description of what went wrong.",
+      "type": "string"
+    }
+  },
+  "required": [
+    "code",
+    "message"
+  ],
+  "type": "object"
+}
    • removedOutput schema / required
      Removed value: -[
-  "canvas_id",
-  "tables",
-  "expires_at"
-]
  4. Changed1 schema field changed
    • changedInput schema / properties / canvas_id / description
      Previous value: -"Canvas ID returned by openmeteo_get_forecast, openmeteo_get_historical, openmeteo_get_ensemble, openmeteo_get_flood, or openmeteo_get_climate when truncated: true."New value: +"Canvas ID returned by openmeteo_get_forecast, openmeteo_get_historical, openmeteo_get_marine, openmeteo_get_air_quality, openmeteo_get_ensemble, openmeteo_get_flood, or openmeteo_get_climate when truncated: true."
  5. Changed1 schema field changed
    • changedInput schema / properties / canvas_id / description
      Previous value: -"Canvas ID returned by openmeteo_get_historical, openmeteo_get_ensemble, openmeteo_get_flood, or openmeteo_get_climate when truncated: true."New value: +"Canvas ID returned by openmeteo_get_forecast, openmeteo_get_historical, openmeteo_get_ensemble, openmeteo_get_flood, or openmeteo_get_climate when truncated: true."
  6. Changed1 schema field changed
    • changedInput schema / properties / canvas_id / description
      Previous value: -"Canvas ID returned by openmeteo_get_historical, openmeteo_get_ensemble, or openmeteo_get_climate when truncated: true."New value: +"Canvas ID returned by openmeteo_get_historical, openmeteo_get_ensemble, openmeteo_get_flood, or openmeteo_get_climate when truncated: true."
  7. Changed1 schema field changed
    • changedInput schema / properties / canvas_id / description
      Previous value: -"Canvas ID returned by openmeteo_get_historical or openmeteo_get_ensemble when truncated: true."New value: +"Canvas ID returned by openmeteo_get_historical, openmeteo_get_ensemble, or openmeteo_get_climate when truncated: true."
  8. Changed1 schema field changed
    • changedInput schema / properties / canvas_id / description
      Previous value: -"Canvas ID returned by openmeteo_get_historical when truncated: true."New value: +"Canvas ID returned by openmeteo_get_historical or openmeteo_get_ensemble when truncated: true."
  9. Added

TDQS

A4.5/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint and idempotentHint, so the safety profile is covered. The description adds genuine context beyond that: it is a discovery/introspection step whose input must originate from one of seven named get_* tools. It does not mention failure behavior for an unknown or expired canvas_id, which keeps it from a 5.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences, front-loaded with the action and scoping, then the sequencing instruction. Every clause earns its place; the tool-name enumeration is necessary because the canvas_id can come from any of those producers.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

An output schema exists, so return values need not be described. For a single-parameter, read-only introspection tool, the description covers purpose, prerequisites, and workflow placement completely.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100% and there is only one parameter, so the schema already documents canvas_id including its pattern and provenance. The description adds nothing about the parameter beyond what the schema states, so the baseline 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb (list) and resource (tables and their columns) scoped to a DataCanvas, and enumerates the producer tools that stage such canvases. An agent can distinguish this immediately from openmeteo_dataframe_query and the get_* family.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly instructs 'Call this first to discover table names before querying with openmeteo_dataframe_query,' giving both ordering and the alternative tool. No inference required.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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