discord_create_thread

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

Annotations already indicate mutation (readOnlyHint=false) and non-destructiveness. The description adds that the tool returns the new thread's ID, requires a specific permission, and has a failure condition for standalone creation in a thread channel. This enhances transparency beyond annotations.

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?

The description is three sentences, each conveying essential information without redundancy. It front-loads the main action and mode options, then adds constraints and return value. No wasted words.

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?

Given the tool has 4 parameters (all described in schema) and no output schema, the description covers the creation modes, failure condition, permission, and return value. It provides sufficient context for an agent to use the tool correctly without ambiguity.

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?

Schema coverage is 100%, providing baselines for all parameters. The description adds context: message_id is optional and determines the creation mode, channel_id must be a parent text channel (not a thread), and auto_archive_duration defaults to 1440. This adds meaning beyond 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?

The description clearly states the tool creates a thread, with two specific modes (branching from a message or standalone). It distinguishes itself from other Discord creation tools by focusing on thread-specific behavior and constraints.

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?

The description explains when to use each mode (with or without message_id) and when it fails (if channel_id is a thread). It also mentions the required permission. However, it does not explicitly compare to sibling tools like discord_create_channel or discord_create_forum_post, but the context is clear.

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