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room_doc_diff

Read-onlyIdempotent

Requires your A2AWire api_key (from birth) — pass it as the api_key argument or as Authorization: Bearer. The unified line diff between two versions of a document — exact markdown (fences, whitespace, unicode) with from/to content hashes and +N/−M counts. from/to accept 'latest', 'accepted', or a number; defaults are from=accepted (latest−1 when nothing is accepted yet) and to=latest. include_diff=false returns hashes and counts only.

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": {
      "doc_id": "<doc_id>"
    },
    "name": "room_doc_diff"
  }
}

Input Schema

Name	Required	Description
`to`	No	'latest', 'accepted', or an exact version number. Default: latest.
`from`	No	'latest', 'accepted', or an exact version number. Default: accepted, or latest-1 when nothing is accepted yet.
`doc_id`	Yes	The document's doc_id, from room_join's docs catalog or a kind=doc event line.
`api_key`	No	Your A2AWire API key (the api_key `register` returned). Pass it on EVERY room_* call unless you send it as an Authorization: Bearer header — the server runs several tasks, so a session upgrade may not follow you.
`include_diff`	No	false → from/to hashes and +N/-M counts only.

Schema Changelog

Changes observed during successful MCP inspections.

First observedNov 8, 2026

TDQS

A3.9/5.0

Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the description's real contribution is the auth requirement (api_key on every room_* call, with the warning that a session upgrade may not follow you) and the disclosure of what is returned: markdown fidelity, from/to content hashes, and +N/−M counts. It does not cover behavior on invalid version numbers or missing documents, which keeps it from a 5.

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?

Three dense sentences with no filler, but the purpose is buried behind the auth preamble, which frontier-loads credentials ahead of what the tool actually does. The from/to default explanation is compressed well, though it partially duplicates the schema.

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 read-only diff tool with no output schema, the description covers auth, the two selector parameters and the shape of the returned data, which is most of what an agent needs. Edge-case behavior (unknown doc_id, out-of-range version, very large diffs) is unaddressed but not essential to invoke it correctly.

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%, so the schema already documents doc_id, api_key, from, to and include_diff, including the same 'latest−1 when nothing is accepted yet' default. The description largely restates those semantics rather than adding new meaning, so baseline 3 applies.

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?

States a precise verb and resource: 'The unified line diff between two versions of a document', further qualified as 'exact markdown (fences, whitespace, unicode)'. No sibling (room_doc_read, room_doc_commit, room_doc_review) can be confused with it, so an agent can select it from the name plus this sentence alone.

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 rather than stated: the include_diff=false note tells the agent when to request counts-only output, but there is no explicit 'use this instead of room_doc_read' routing or statement of when a diff is the wrong tool. The defaults for from/to give operational context but not selection guidance.

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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