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taylorwilsdon

Google Workspace MCP Server - Control Gmail, Calendar, Docs, Sheets, Slides, Chat, Forms & Drive

by taylorwilsdon
OverviewSchemaRelated ServersScoreDiscussions
Python
Hybrid

List Calendars

list_calendars
Read-onlyIdempotent

Retrieve all Google Calendars accessible to a user's email account, with pagination for large result sets.

Instructions

Retrieves a list of calendars accessible to the authenticated user.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
page_tokenNoToken for the next page, taken from a previous response.
max_resultsNoMaximum calendars to return in one page. Omit to use the API default.
user_google_emailYesThe user's Google email address. Required.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections. Dates show when Glama detected each change.

  1. Changed2 schema fields changedv1.26.0
    • addedInput schema / properties / max_results
      Added value: +{
+  "anyOf": [
+    {
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Maximum calendars to return in one page. Omit to use the API default."
+}
    • addedInput schema / properties / page_token
      Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Token for the next page, taken from a previous response."
+}
  2. Changed7 schema fields changedv1.0.1
    • addedInput schema / additionalProperties
      Added value: +false
    • removedInput schema / properties / service
      Removed value: -{
-  "title": "service",
-  "type": "string"
-}
    • addedInput schema / properties / user_google_email / description
      Added value: +"The user's Google email address. Required."
    • removedInput schema / properties / user_google_email / title
      Removed value: -"User Google Email"
    • changedInput schema / required
      Previous value: -[
-  "service",
-  "user_google_email"
-]New value: +[
+  "user_google_email"
+]
    • removedInput schema / title
      Removed value: -"list_calendarsArguments"
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "properties": {
+    "result": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "result"
+  ],
+  "type": "object",
+  "x-fastmcp-wrap-result": true
+}
  3. First observedv1.0.0

TDQS

A4.3/5.0
Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint, and non-destructive behavior, so the safety profile is covered. The description adds the auth-scope context ('accessible to the authenticated user'), which is useful beyond the schema and annotations. It does not contradict any annotation.

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?

A single, front-loaded sentence that states the action, resource, and scope with no filler. Every word earns its place.

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?

The tool is a simple read-only list operation with an output schema, complete parameter descriptions, and rich safety annotations. The description is sufficient for an agent to invoke it correctly without additional context.

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 every parameter, including the required user_google_email, is already documented in the input schema. The tool description adds no parameter-level meaning beyond what the schema provides.

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?

The description uses a specific verb ('Retrieves') and resource ('calendars') with a clear scope ('accessible to the authenticated user'). It is immediately distinguishable from siblings like create_calendar or get_events.

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

Usage Guidelines4/5

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

The description gives clear context: this tool lists calendars for the authenticated user, which is the natural choice when enumerating available calendars. It does not explicitly name alternatives or exclusions, but the scope is specific enough to guide basic selection.

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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