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

Annotations already declare readOnly, idempotent, non-destructive, so the safety profile is covered. The description adds genuine behavioral context beyond that: credential handling (argument or Authorization header), where permissions live ("canonical handler"), and a security guarantee that credentials are never placed in URLs or echoed in errors. This is meaningful added disclosure, though no rate limits or return behavior are described.

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?

Three sentences, front-loaded with the purpose, and no obvious padding. However, the two auth sentences dominate while the actual function ("P3 state") stays under-explained, so the emphasis is somewhat misallocated.

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?

There is no output schema, so the description should clarify what "P3 state" actually returns, which it does not. For a low-complexity read-only tool the auth details are adequate, but the agent still cannot tell what observing this state yields.

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 50%: the credential param has its own description, but the required id param has none. The description explains the credential param's two supply mechanisms (argument or Authorization header), which adds value, but says nothing about what id should be. Baseline 3 for partial-coverage schema plus some added credential meaning.

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?

"Observe your own P3 state" gives a clear verb (observe) but the resource ("P3 state") is undefined jargon that doesn't obviously map to the tool name author_test_state. With many sibling state/status tools (author_status, certification_state, play_state, certification_replay), nothing distinguishes this one from them. The purpose is only vaguely inferable.

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 addresses authentication mechanics (credential argument vs Authorization header) but never says when to use this tool versus siblings like author_status or certification_state, nor any prerequisites or exclusions. No usage routing is provided.

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