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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds useful context such as the fee (0.005 USDC), the digest-based delta mechanism, and the exact record/template/evidence contents, but it does not explain response shape or pagination behavior.

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 a single compact sentence that front-loads the core purpose and packs content, delta semantics, evidence, templates, and pricing without unnecessary filler. It is efficient, though the final clause is dense.

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 simple read-only, idempotent feed with two parameters, the description is adequate but not complete. It lacks explicit return-format details and does not fully connect the optional SHA-256 parameter to delta mode, which would matter given there is no output schema.

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%, but the description partially compensates by naming 'snapshot' and 'digest-based delta,' which maps to the mode enum. It does not explicitly clarify when since_snapshot_sha256 should be supplied, though the pattern and parameter name make the intent inferable.

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 states a specific resource: a canonical catalog snapshot or digest-based delta, and enumerates its contents (HTTP/MCP records, PHION Execute templates, signed evidence). This goes beyond the name and distinguishes the tool from the many evidence/verification siblings, though it lacks an explicit verb.

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 'snapshot or digest-based delta' wording implies when the tool should be used, but it does not provide explicit when-to-use guidance, exclusions, or comparisons with sibling tools. Usage context is present mainly by inference from the content description.

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