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mailpouch

mailpouch

by chandshy
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Local

Star / Unstar Email

star_email
Idempotent

Toggle the starred status of an email to flag important messages or remove the flag when it is no longer needed.

Instructions

Toggle the starred (flagged) status of an email. isStarred defaults to true. Pass sourceFolder whenever the UID came from a folder other than INBOX.

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": {
      "emailId": "<emailId>"
    },
    "name": "star_email"
  }
}

Input Schema

NameRequiredDescriptionDefault
emailIdYes
isStarredNo
account_idNoOptional account ID to route this call to (multi-account configs). Omit to use the active account. Configured account IDs are listed in the settings UI (Accounts tab).
sourceFolderNoFolder the UID(s) live in (e.g. INBOX, Folders/Work, Labels/Foo). Strongly recommended whenever the UIDs came from a folder other than INBOX — IMAP UIDs are folder-scoped, so without this the wrong folder may be selected and the operation may silently no-op. Avoid passing 'All Mail' as the source: it is a union view of every folder, not a real location, so moves out of it can silently do nothing — pass the message's actual folder instead. Moving to the folder a message is already in is a no-op.

Output Schema

NameRequiredDescriptionDefault
reasonNo
successYes
messageIdNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changedv3.1.0
    • addedInput schema / properties / account_id
      Added value: +{
+  "description": "Optional account ID to route this call to (multi-account configs). Omit to use the active account. Configured account IDs are listed in the settings UI (Accounts tab).",
+  "type": "string"
+}
  2. First observedv3.0.77

TDQS

A3.7/5.0
Behavior2/5

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

The description says 'toggle' but annotations indicate idempotentHint=true, creating a contradiction: toggling implies non-idempotent flip while setting a boolean is idempotent. This misleads about actual behavior. Beyond that, no side effects or permissions are disclosed.

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, no wasted words. The first sentence states the action, the second adds critical usage detail. Perfectly front-loaded.

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

Completeness3/5

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

For a simple mutation tool, the description covers the main behavior and a key usage note. However, the toggle ambiguity and lack of mention about return value or required permissions (though output schema exists) leave some gaps.

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

Parameters4/5

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

The description adds value by stating the default for isStarred and the strong recommendation for sourceFolder. Although emailId is not described, the schema coverage is 50% and the description compensates with practical context.

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 clearly states 'Toggle the starred (flagged) status of an email' which is a specific verb-resource pair. It distinguishes from siblings like bulk_star by focusing on single email.

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

Usage Guidelines3/5

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

The description provides a specific guideline about passing sourceFolder when the UID came from a folder other than INBOX. However, it does not explicitly tell when to use this tool over alternatives like bulk_star or mark_email_read, leaving usage context implied.

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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