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

Annotations already declare a safe read profile (readOnlyHint, idempotentHint, destructiveHint false), and the description adds substantive return-content detail: formal actions, penalties, and a per-program summary of formal/informal actions, cases, and total penalties. It also discloses the required identifier dependency. No behavioral contradictions with annotations.

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?

Two sentences with no filler; the first sentence states purpose and output composition, and the second handles the prerequisite and lookup routing. Every clause earns its place.

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, read-only lookup tool with no output schema, the description supplies the essential call context (required ID, how to obtain it) and the response shape (enforcement actions, penalties, per-program summary). There are no obvious gaps that would prevent an agent from correctly selecting and invoking the 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?

The input schema already documents registry_id with type, requirement, source tool, and an example, so schema coverage is 100%. The description reinforces the Registry ID requirement and lookup path but adds little semantic nuance 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 begins with a concrete verb-resource pairing ('List formal enforcement actions and penalties taken against a facility') and specifies the additional per-program summary output. It clearly states the prerequisite and points to epa_facility_search, but it does not explicitly contrast with other EPA facility tools such as epa_facility_compliance or epa_water_or_air_violations.

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 states the required input condition ('Requires an EPA Registry ID') and routes users to epa_facility_search when one is not available. This is clear context for invocation, but it does not state when enforcement search should be preferred over sibling compliance/violation tools, so no exclusions or alternative comparisons are present.

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