discord_create_thread

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

Annotations already declare readOnlyHint=false, destructiveHint=false, and openWorldHint=true, so the safety profile is covered by structured data. The description adds the lifecycle context (what to use instead for edit/delete) but says nothing about required permissions, forum-vs-text channel constraints, or side effects of starting a thread on a message.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

One dense sentence front-loads the verb and the three modes, followed by a short routing sentence. No filler, every clause carries information.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 7-parameter non-destructive write with no output schema, the description covers the main decision points and the lifecycle alternatives. Gaps remain around auto_archive_minutes semantics and channel-type restrictions, but the essential call-shaping context is present.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 71% schema coverage the description adds real value by tying the creation modes to specific parameters: message_id for message-anchored threads and content for forum posts. It does not explain auto_archive_minutes or the private flag's restriction, which are only partly covered by the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ('Create a thread') and enumerates the three distinct creation modes (from message_id, standalone, forum post). It also routes lifecycle operations to the correct siblings by name, so an agent can distinguish it from discord_create_channel or discord_edit_channel without opening a schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

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

Explicitly names the alternative tools for editing, archiving, and deleting threads, which is strong routing guidance. However, it never states the conditions for choosing between the three creation modes (message-based vs standalone vs forum), leaving that inference to the caller.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.