Threads MCP Server

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

No annotations are provided, so the description carries full burden. It states 'Create' implying a write operation but doesn't disclose behavioral traits such as required permissions, whether creation is idempotent, or what happens on failure. This leaves significant gaps for a mutation tool with no annotation coverage.

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 a single, efficient sentence with zero waste, front-loading the key action and purpose. It is appropriately sized for a simple creation tool with two parameters.

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 complexity of a mutation tool with no annotations and no output schema, the description is incomplete. It lacks details on return values, error handling, or side effects, which are crucial for an agent to use this tool correctly in context with siblings like 'update_group' or 'delete_group'.

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 description coverage is 100%, so parameters 'name' and 'description' are documented in the schema. The description adds no additional meaning beyond the schema, such as format constraints or examples, but the baseline is 3 since the schema adequately covers parameter details.

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 action ('Create') and resource ('new group'), specifying its purpose for 'cross-cutting organization'. It distinguishes from siblings like 'update_group' or 'delete_group' by focusing on creation, though it doesn't explicitly contrast with similar tools like 'create_container' or 'create_thread'.

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?

No guidance is provided on when to use this tool versus alternatives like 'create_container' or 'create_thread', nor does it mention prerequisites or exclusions. The description implies usage for organizational purposes but lacks explicit context for selection among sibling tools.

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