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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world, so the bar is lower; the description still adds real value by disclosing determinism, that it computes only from supplied data, that it stores nothing, and that output is a technical rather than legal interpretation. It does not describe how observations are weighted or what an ambiguous/unknown phase does, but the persistence and safety profile is clearly disclosed.

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?

A single front-loaded sentence with three tight clauses; every clause (deterministic, supplied-data-only, technical-not-legal) carries information the agent cannot get from structured fields.

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 output schema covers return values and the annotations cover safety, but the grading criteria themselves are opaque — the description never indicates what inputs drive an adverse finding or how "unknown" phase observations are treated. Adequate to call the tool, thin for interpreting its result.

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%, so the description must carry the load, and it only gestures at "observations by consent phase." It never explains the phase enum values (before_consent, after_reject, after_accept, unknown), the role of consentBannerPresent, what "redacted" implies about the domain field, or how typedValueTransmitted affects the grade.

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 names a specific verb ("grades") and a specific resource ("redacted set of tracker-request observations by consent phase"), so an agent can tell it apart from the sibling compare_consent_observations. It stops short of explicitly naming the sibling or stating the precise output of the grade, which keeps it from 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?

There is no statement of when to use this versus inspect_runtime_consent, inspect_site_tracking, or compare_consent_observations, and no prerequisites or exclusions. The clause "technical—not legal—interpretation" hints at scope but is a disclaimer rather than usage routing.

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