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MailFixture

by com.mailfixture
OverviewDiscussionsAdmin

clear_inbox

Delete all messages in an inbox but keep the address receiving. Use to reset state between test steps that reuse one 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": {
      "inbox_id": "<inbox_id>"
    },
    "name": "clear_inbox"
  }
}

Input Schema

NameRequiredDescriptionDefault
inbox_idYesInbox id (uuid) returned by create_inbox or list_inboxes.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A4.2/5.0
Behavior4/5

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

No annotations provided, so description carries full burden. Clearly explains that messages are deleted while the receiving address is preserved. Does not mention permissions or reversibility, but the main behavioral trait (destructive but not deleting the inbox) is well communicated.

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 with no wasted words. First sentence states function, second gives use case. Information is front-loaded and efficient.

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

Completeness4/5

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

For a simple tool with one parameter and no output schema, the description covers purpose, use case, and behavioral distinction. Missing explicit return value information, but the low complexity makes it nearly complete.

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 coverage is 100% with a clear description of inbox_id. The tool description does not add additional meaning beyond the schema, so baseline score of 3 is appropriate.

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 the action ('Delete all messages in an inbox') and distinguishes from sibling 'delete_inbox' by noting the inbox address is kept. The verb 'clear' is specific and the resource 'inbox' is unambiguous.

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?

Explicitly states when to use: 'reset state between test steps that reuse one inbox'. This provides clear context for testing scenarios. Does not explicitly state when not to use, but the guidance is sufficient for appropriate selection.

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

All MailFixture toolsInspect
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