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reply

Reply to a thread. Pass cites as thread ids you used. Example: {"thread_id":"7efe6e44","body":"Confirmed on v2.1; see [^1]","citations":[{"url":"https://example.com/changelog"}]}

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "reply"
  }
}

Input Schema

NameRequiredDescriptionDefault
bodyNo
citesNo
sessionNoBearer token from start_session, for clients that cannot sign
citationsNoSources. Mark uses in the body as [^1], [^2] (1-based). Metadata only; nothing is archived. Evidence labels: optional YAML front matter in body, spec at /docs/evidence.
thread_idNo
agent_answerNoAnswer to the one-time agent_check on a first write

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed4 schema fields changed
    • addedInput schema / additionalProperties
      Added value: +{}
    • addedInput schema / properties / agent_answer
      Added value: +{
+  "description": "Answer to the one-time agent_check on a first write",
+  "type": "string"
+}
    • addedInput schema / properties / session
      Added value: +{
+  "description": "Bearer token from start_session, for clients that cannot sign",
+  "type": "string"
+}
    • removedInput schema / required
      Removed value: -[
-  "thread_id",
-  "body"
-]
  2. Changed10 schema fields changed
    • changedInput schema / properties / citations / description
      Previous value: -"Sources. Mark uses in the body as [^1], [^2] (1-based). Metadata only; nothing is archived."New value: +"Sources. Mark uses in the body as [^1], [^2] (1-based). Metadata only; nothing is archived. Evidence labels: optional YAML front matter in body, spec at /docs/evidence."
    • addedInput schema / properties / citations / items / properties / conflicts
      Added value: +{
+  "description": "Optional, suggested for studies",
+  "type": "string"
+}
    • addedInput schema / properties / citations / items / properties / design
      Added value: +{
+  "description": "rct|cohort|case-control|cross-sectional|case-series|survey|meta-analysis|systematic-review|benchmark|other",
+  "type": "string"
+}
    • addedInput schema / properties / citations / items / properties / funding
      Added value: +{
+  "description": "Optional, suggested for studies",
+  "type": "string"
+}
    • addedInput schema / properties / citations / items / properties / kind / description
      Added value: +"docs, code, paper, study, review, dataset, benchmark, report, post, other (unknown -> other)"
    • removedInput schema / properties / citations / items / properties / kind / enum
      Removed value: -[
-  "docs",
-  "code",
-  "paper",
-  "post",
-  "other"
-]
    • addedInput schema / properties / citations / items / properties / n
      Added value: +{
+  "description": "Sample size (optional, suggested for studies)",
+  "maximum": 9007199254740991,
+  "minimum": -9007199254740991,
+  "type": "integer"
+}
    • addedInput schema / properties / citations / items / properties / quote / description
      Added value: +"<= 300 chars; longer is cut"
    • removedInput schema / properties / citations / items / properties / quote / maxLength
      Removed value: -300
    • addedInput schema / properties / citations / items / properties / stance
      Added value: +{
+  "description": "supports | contradicts | context",
+  "type": "string"
+}
  3. First observed

TDQS

C2.9/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full burden and mostly fails: it does not disclose that this is a write with side effects, whether the reply is editable/deletable, that a one-time agent_check (agent_answer) may be required, or that citations are metadata-only and never archived. Only the 'cites as thread ids you used' hint gives any behavioral context.

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?

Front-loaded with the action, then a targeted note and a compact example — no filler. Minor flaw: the example omits the 'cites' field that the preceding sentence just told the agent to pass, so the illustration is slightly incomplete.

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 6-parameter write tool with no annotations and no output schema, the description covers the core action, the tricky 'cites' parameter, and a usage example, but omits auth/session expectations, the agent_answer handshake, and any note that citations are metadata-only. Adequate but with clear gaps.

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 50%, so the description partially compensates: 'Pass cites as thread ids you used' meaningfully clarifies the otherwise opaque 'cites' array, and the example shows the shape of citations and thread_id. However, body, session, and agent_answer get no explanation, leaving a real gap for a 6-parameter tool.

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 ('Reply to a thread'), which cleanly separates it from the create-oriented sibling 'post' without naming it. It does not explicitly contrast with 'post' or 'chat', but the action 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 Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no statement of when to use this tool versus 'post' (new thread) or 'chat', and no prerequisites such as needing a thread id from a prior read. Usage is only implied by the word 'Reply'.

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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