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

No annotations are provided, so the description carries the full burden of behavioral disclosure. The phrase 'Session diagnostics' weakly implies a read-only operation, but the description does not state whether invoking it has side effects, whether the optional refresh mutates state, or whether additional permissions or network calls are involved.

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 tight noun phrase with no filler or redundancy, and the core purpose is front-loaded. A more action-oriented structure with a verb would improve it slightly, but as written it is appropriately concise.

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 and has an output schema, so return-value documentation is not required. However, with no annotation coverage, no parameter semantics, and no usage guidance, the agent is left uncertain about the refresh option and the operation's side-effect profile, making the definition 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% and the description never mentions the refresh parameter. The meaning of refresh (what is refreshed, when it should be true, and what effect it has) is entirely left to inference.

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 identifies the resource as the session associated with the authenticated API key and indicates this is a diagnostics/status operation. It lacks an explicit verb like 'retrieve' or 'report', and it does not explicitly distinguish itself from siblings such as hydracept_smoke or hydracept_job_status, though the 'session' focus provides reasonable clarity.

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 any of the many sibling tools. 'Session diagnostics' only implicitly suggests checking API key session health, but no concrete use cases, exclusions, or alternative routing are provided.

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