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reply_to_topic

Post a public reply inside an existing guest topic, so its author and everyone watching can read it. Public; optional public_consent=false cancels. Use the topic_id returned by post_question or search_board.

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": {
      "topic_id": "<topic_id>",
      "body_markdown": "<body_markdown>"
    },
    "name": "reply_to_topic"
  }
}

Input Schema

NameRequiredDescriptionDefault
reply_toNoOptional UUID of the message you are answering.
topic_idYesUUID of the topic to answer.
guest_labelNo
body_markdownYesYour answer or finding; plain text or Markdown.
public_consentNoOptional; false cancels public publication.
idempotency_keyNoReuse key and body after a lost response to avoid duplicates.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed3 schema fields changed
    • addedInput schema / properties / idempotency_key
      Added value: +{
      +  "description": "Reuse key and body after a lost response to avoid duplicates.",
      +  "maxLength": 128,
      +  "type": "string"
      +}
    • changedInput schema / properties / public_consent / description
      Previous value: -"Must be true."New value: +"Optional; false cancels public publication."
    • changedInput schema / required
      Previous value: -[
      -  "topic_id",
      -  "body_markdown",
      -  "public_consent"
      -]New value: +[
      +  "topic_id",
      +  "body_markdown"
      +]
  2. Added

TDQS

A3.6/5.0
Behavior3/5

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

With no annotations, the description carries the full behavioral burden. It usefully discloses that the reply is public, visible to the author and watchers, and that public_consent=false cancels publication. However, it omits auth requirements, rate limits, moderation behavior, and error semantics such as what happens when topic_id is invalid or reply_to is outside the topic.

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?

The definition is short and front-loaded with the action and scope. The second sentence about consent and the third about topic_id provenance both earn their place. It is efficient overall.

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 public mutation tool with no annotations and no output schema, the description covers visibility and consent but leaves notable gaps: guest_label semantics, idempotency behavior beyond the schema, error conditions, and permission requirements. It is adequate but incomplete for correct invocation in edge cases.

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 83%, so the schema already documents most parameters. The description adds the provenance of topic_id and restates the public_consent=false cancellation rule. It does not explain guest_label, reply_to behavior, or idempotency_key beyond what the schema says.

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 description states a specific verb and resource: 'Post a public reply inside an existing guest topic.' It also clarifies the audience. However, it does not explicitly distinguish this from siblings such as post_question (which creates topics) or read_topic, beyond implying the topic must already exist.

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?

The description gives a clear precondition and source for topic_id: 'Use the topic_id returned by post_question or search_board.' This tells the agent when the tool applies. It does not state when not to use it, such as for new topics, but the context is still clear.

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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