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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive), so the bar is lower, and the description still adds real behavior: the required permission and default role floor, the 90-day window cap, the exact return composition, and the note that CSV is HTTP-only while this tool returns JSON. It does not discuss pagination or volume behavior for a potentially large event stream.

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?

Four dense sentences, front-loaded with tier and purpose, and each carries distinct information (output shape, endpoint, permission, format caveat). Slightly packed with parenthetical qualifiers, but no filler sentences.

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 correctly compensates by enumerating the return contents and the JSON-vs-CSV distinction, and it covers auth and window limits. It is close to complete; error behavior for an over-90-day window or result-size handling is the only notable gap.

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 100%, so both parameters and the ≤90-day/ordering constraints are already documented in the schema. The description's 'Inputs: from and to as YYYY-MM-DD strings' restates the schema without adding format nuance beyond it, which is the baseline-3 case.

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?

Names a specific verb+resource ('compliance evidence export') and pins down the payload precisely: per-week timesheet compliance, the TIMESHEET_* AuditLog event stream, and summary totals, plus a REST endpoint mapping. That implicitly separates it from generic siblings like export_audit_log or weekly_compliance, though it never names an alternative explicitly, which keeps it short of a 5.

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?

Gives the intended audience and use case (SOX/HIPAA shops feeding external GRC tools) and the gating conditions (ENTERPRISE+ tier, org.compliance.manage, ≤90-day window), but offers no explicit guidance on when to pick this over export_audit_log, list_audit_log, or weekly_compliance, which is the real selection question for an agent. Usage is implied rather than routed.

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