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

Annotations already disclose readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds the behavioral traits 'deterministic' and 'signed', which are useful, though 'deterministic' largely overlaps with the idempotency annotation. It does not describe authentication needs, rate limits, or failure behavior, but it does not contradict the 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 compact sentence with no filler or redundancy beyond echoing the title. The phrase 'deterministic signed assessment over supplied input' is front-loaded and easy to scan. It is concise, though its brevity limits substance.

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 tool involving OAuth issuer binding and signed evidence, the description leaves too much unexplained: what 'issuer binding' means, what the assessment output looks like, and how the required parameters interact. Output schema and annotations cover return shape and safety, but the description itself is not complete enough for an agent to confidently know when or why to invoke this tool.

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 reported as 100%, so the parameters claims, expected_issuer, and expected_audience are already documented in the schema. The description itself adds no parameter-level explanation, which is acceptable under the high-coverage baseline, but it also does not enrich the meaning of those parameters.

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 that this tool produces a 'deterministic signed assessment over supplied input', which hints at an assessment/evidence-generation operation. However, it never says what the assessment verifies about OAuth issuer binding or how it relates to the required claims, expected_issuer, and expected_audience parameters. It is more specific than a pure tautology but remains vague and does not distinguish it from sibling evidence tools.

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?

There is no guidance on when to use this tool versus alternatives such as oauth_token_audience_guard, mcp_server_identity_evidence, or other evidence-generation tools. The description provides no prerequisites, exclusions, or typical use cases, leaving selection entirely to inference.

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