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

Beyond the annotations (readOnly, idempotent, non-destructive), the description discloses deterministic execution, server-vs-browser compute routing, transient non-retained processing, and AP2 artifact export with execution_hash. These are real behavioral traits not covered by the annotations, though the privacy/compute boilerplate is repeated verbatim from the schema.

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 text is a dense block of infrastructure boilerplate front-loaded with a title restatement rather than the tool's function. The compute-mode explanation duplicates the schema's compute property, and the trailing FV-status hash sentence does nothing to help an agent select or invoke the tool.

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 compliance checker with an open-ended nested policy_parameters object and no output schema, the description omits both what is being checked and what inputs are expected. It covers execution mechanics but leaves the actual decision function and its required fields undocumented.

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 the baseline is 3. The description adds no meaning to parameters and explicitly defers field names to 'the tool's manifest,' offering no compensating detail for the opaque policy_parameters object.

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 opening clause 'DPA Article 28 Completeness Checker: OpenChainGraph compute node' is essentially a restatement of the name and title, followed by infrastructure metadata. Nothing explains what Article 28 completeness actually means or what the tool verifies, so the description adds no differentiation from the many sibling compliance checkers. The name carries nearly all the semantic load.

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 when-to-use guidance, no when-not-to-use, and no named alternative among the numerous sibling checkers. The only directive is 'Use synthetic or anonymised inputs only,' which is an input constraint rather than selection guidance.

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