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Weigh in on a decision

weigh_in
DestructiveIdempotent

Records a preference, objection or additional option at the current decision revision with a reason. New input replaces the participant's current stance and preserves attributed history; consensus remains subject to human review.

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>",
      "client_id": "<client_id>",
      "decision_id": "<decision_id>",
      "base_revision": "<base_revision>",
      "kind": "<kind>",
      "reason": "<reason>"
    },
    "name": "weigh_in"
  }
}

Input Schema

NameRequiredDescriptionDefault
kindYes
optionNo
reasonYes
room_idYesRoom ID authorized by secure OAuth consent.
client_idYesCaller-generated UUID identifying one operation. Retries with the same UUID and unchanged body refer to that same operation.
option_idNoCaller-generated UUID identifying one operation. Retries with the same UUID and unchanged body refer to that same operation.
decision_idYesCaller-generated UUID identifying one operation. Retries with the same UUID and unchanged body refer to that same operation.
base_revisionYes

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?

The annotations already declare a destructive, non-read-only, idempotent mutation. The description adds meaningful behavior beyond those hints: new input replaces the participant's current stance, attributed history is preserved, and consensus remains subject to human review. It does not explain stale base_revision conflicts or authorization requirements, so it is strong but not complete.

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?

The description is two tightly written sentences with the core action front-loaded and no filler. The second sentence efficiently carries the replacement, history-preservation, and human-review safeguards.

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 destructive eight-parameter mutation with no output schema, the description covers the main side effect and review safeguard. It still omits important operational details such as how option and option_id interact, when option is required, and what happens when base_revision is stale.

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?

With 50% schema description coverage, the description partially compensates by mapping 'preference, objection or additional option' to the kind/option semantics, and by tying reason and current revision to base_revision. It leaves option_id, client_id, decision_id, conditional option requirements, and base_revision conflict behavior unexplained, so substantial schema gaps remain.

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?

The opening is a specific verb-plus-resource statement: 'Records a preference, objection or additional option at the current decision revision with a reason.' It clearly distinguishes taking a stance on an existing decision from opening or proposing one, though it does not explicitly name competing siblings such as vote_poll or propose_decision.

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 phrase 'at the current decision revision' implies this tool is for adding input to an existing decision and that revision currency matters. However, the description gives no explicit when-to-use guidance versus vote_poll, propose_decision, purpose_support_decision, or propose_poll_result, and it does not state when not to use this tool.

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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