SLO Summary

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

The readOnlyHint annotation already communicates that this is a read-only operation, so the description does not need to restate that. It adds useful context about the SLO/release-gate framing, but it does not explain what actually happens when thresholds are applied, whether a pass/fail result is produced, or how session state factors in.

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, dense sentence with no filler. It front-loads the action and the primary resource, making it easy to scan.

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?

With no output schema, the description should explain what the agent will receive after applying thresholds, but it does not. It also omits how session state is used, what shape the report must have, and what format thresholds take, leaving too much to inference for a nested-parameter 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 low at 33%, with report and thresholds being bare objects. The description partially compensates by identifying report as an evaluation report and thresholds as SLO thresholds, but it does not explain their expected structure, how the thresholds map to report metrics, or the role of session_id beyond the schema.

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 gives a specific verb ('apply') and resource ('release-gate style SLO thresholds to an evaluation report'), so the core purpose is clear. It is implicitly distinct from sibling tools like report_summary or compare_runs, but it does not explicitly name an alternative or contrast itself.

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 this tool should be used rather than lens.report_summary, lens.audit_report, or lens.compare_runs. The phrase 'release-gate style' hints at a scenario but does not state prerequisites, exclusions, or conditions that would route an agent to this tool.

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