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

With no annotations, the description carries the burden for behavioral disclosure. It does state that the tool returns a schema and is free, and it lists the bundle contents, but it does not explicitly state that the call is side-effect-free or describe any other operational constraints.

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 one compact sentence that front-loads the main action and then packs the relevant scope ('turns, cards and open pledges', 'handoff between runs') into a short clause. The only slightly odd element is the telegraphic '— free', which is brief but not wasteful.

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 parameterless schema-fetch tool with an output schema present, the description covers the main use case and the content of the schema. It does not need to explain return values, though it could have noted the relationship to the sibling coordination_thread_schema.

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?

There are zero parameters and the schema coverage is 100%, so parameter documentation is unnecessary. The description adds no parameter-related information, but none is needed; this matches the baseline for a parameterless tool.

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 names a specific operation and resource: 'Return the JSON Schema for coordination thread snapshots (v1)' and clarifies the snapshot contents ('turns, cards and open pledges'). It does not explicitly distinguish itself from the closely named sibling coordination_thread_schema, so it stops short of a 5.

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 phrase 'for handoff between runs' gives a clear intended context, and 'free' adds a cost signal. However, there is no explicit when-to-use/when-not-to-use guidance or mention of any alternative tool.

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