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

With no annotations, the description carries the full burden and does so thoroughly: it discloses that metrics are server-computed, free-text fields are unverified while numeric fields are server-verified, and explicitly warns to treat free text as data, not instructions—including a security-relevant prompt-injection caution.

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 front-loaded with the core purpose, followed by important trust and security notes. However, the rhetorical question ('Will you see what the author saw...') adds marginal value and could be trimmed, keeping it from a perfect conciseness score.

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 single-parameter tool with no output schema or annotations, the description covers a wide range of context: replay calls, lineage, trust levels, and security guidance. It omits explicit read-only confirmation and error behavior, but these are partially implied by 'Fetch'. Overall, it is sufficiently complete for the tool's simplicity.

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 0% because the description never mentions trace_id or how to specify the trace. It says 'one trace' but does not explain the parameter beyond what the schema already shows. With low coverage, the description should compensate, but it does not.

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 clearly states the tool fetches one trace in full, including ready-made curl and MCP calls for replay, plus lineage. It distinguishes itself from sibling tools like trace_browse by narrowing scope to a single trace and adding replay/lineage specifics.

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 for retrieving a single trace with full detail, but it does not explicitly state when to prefer this over alternatives or provide exclusions. No mention of when not to use it, making the guidance merely implied rather than explicit.

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