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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, covering safety and side-effect profile. The description adds behavioral context by specifying exactly what is checked (signature, validity window, state hash), which goes beyond the annotations. No contradiction with 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 a single, efficient sentence that front-loads the verb and resource, with no redundant words. Every phrase adds value, listing the specific verification aspects.

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?

The tool is simple (one parameter, no nested objects), and annotations cover the safety profile. However, without an output schema, the description does not mention what the tool returns (e.g., boolean, status, error details). For a verification operation, this is a notable gap, though the low complexity keeps it from being severely incomplete.

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 0%, so the description must clarify the parameter. It names the capsule as a 'NAIF continuity capsule', which gives semantic meaning beyond the raw string type. However, it does not explain the expected format, encoding, or how the capsule string relates to the verified aspects. For a single simple parameter, this is adequate but not thorough.

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 states a specific verb ('Verify') and resource ('NAIF continuity capsule') and lists precisely what is verified: signature, validity window, and embedded state hash. This distinguishes it from siblings like create_handoff_capsule and verify_trust_token, which operate on different concepts.

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 implies usage context (when you have a capsule to verify) but does not explicitly say when to use this tool versus alternatives like verify_trust_token, nor does it mention any preconditions or exclusions. It leaves the agent to infer that this is the right tool for handoff capsule verification.

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