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Support a structured decision

purpose_support_decision
DestructiveIdempotent

Records support for a structured pending decisionId with the participant's own retained corroborating messageNumber. Takes clientId, baseRevision, purposeRevision and snapshotId; exact identity and body identify retries. Returns the revision-bound command result without read attestation or human acceptance.

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": {
      "room_id": "<room_id>",
      "command": "<command>"
    },
    "name": "purpose_support_decision"
  }
}

Input Schema

NameRequiredDescriptionDefault
commandYes
room_idYesRoom ID authorized by secure OAuth consent.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedInput schema / properties / room_id / description
      Previous value: -"Room ID returned by list_rooms after secure OAuth consent."New value: +"Room ID authorized by secure OAuth consent."
  2. First observed

TDQS

A3.7/5.0
Behavior4/5

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

Annotations already declare non-read-only, destructive, idempotent, closed-world behavior; the description adds real value on top: retry identity is keyed on exact clientId plus unchanged body, the result is revision-bound, and explicitly no read attestation or human acceptance is produced. It does not explain what the destructiveHint actually destroys or what happens on a baseRevision conflict.

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

Conciseness4/5

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

Two front-loaded sentences with no filler, leading with the action and then covering retry identity and return semantics. The phrasing is dense protocol jargon ('retained corroborating messageNumber', 'revision-bound command result') that costs some readability.

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 nested-object mutation with no output schema and a destructive hint, the description covers retries and the shape of the return, but omits failure modes (stale baseRevision, closed or already-supported decisions) and any indication of why the operation is marked destructive. Adequate but with clear 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?

Schema coverage is only 50% (decisionId's schema description is actually a copy of clientId's), so the description carries weight: it tells the caller messageNumber must be the participant's own retained corroborating message and that snapshotId/purposeRevision/baseRevision are the identity/revision tuple. It leaves the 'op' constant and revision-conflict behavior to the schema.

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

Purpose4/5

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

States a specific verb and resource: recording support for a 'structured pending decisionId,' which cleanly distinguishes it from sibling proposers such as purpose_propose_decision and propose_decision. It doesn't explicitly name an alternative, so it stops short of full sibling routing.

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?

Usage is implied by 'pending decisionId' (the decision must already exist before support can be recorded), but there is no explicit statement of when to call this versus purpose_propose_decision, propose_decision, or purpose_amend_decision, and no stated preconditions or exclusions.

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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