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discord_reply_to_forum

Send a follow-up message inside an existing Discord forum post. Returns the new message ID.

Instructions

Post a follow-up message inside an existing forum post (thread). Requires the Send Messages permission. Use discord_create_forum_post to start a new post instead. Returns the new message ID.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
thread_idYesID (snowflake) of the forum post (thread) to reply in.
contentYesPlain-text body of the reply (max 2000 characters).
Behavior4/5

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

Adds permission requirement and return value (new message ID) beyond annotations. No contradictions with annotations (readOnlyHint false, destructiveHint false).

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?

Two sentences, no wasted words. Front-loaded action, then alternative and result. Highly efficient.

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 simple mutation tool with no output schema, description covers purpose, alternative, permission, and return value. Lacks error conditions or rate limits but overall adequate.

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 100% with good descriptions. Description does not add further parameter semantics beyond what schema provides, so baseline 3 is appropriate.

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?

Clearly states the tool posts a follow-up message in an existing forum thread. Distinguishes from creating new posts by naming discord_create_forum_post. Verb+resource+scope is specific.

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?

Explicitly says when to use (reply to existing post) and when to use alternative (create new post). Also mentions required permission. Could mention other related tools like update/delete, but sufficient.

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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