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

Annotations already cover the read-only, idempotent, non-destructive profile, so the description adds genuine value by disclosing what a returned row contains (control totals plus a hash) and, critically, that the link re-downloads the exact original file rather than re-deriving it. That is a behavioral guarantee an agent cannot infer from the annotations, though nothing is said about ordering or time bounds of the listing.

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?

Three short sentences, front-loaded with what it is, then the use case, then the row contract. The phrase "in which shape, through when" is slightly oblique where "in what form, up to which date" would be plainer, but nothing is padded.

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 parameters, no output schema and full annotation coverage, the description carries the remaining burden and does explain the shape of a row and the meaning of the link. The only gap is scope of the listing (all exports ever, or a window), which matters given the schema offers no filtering.

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 takes zero parameters, so per the baseline this sits at 4. There is nothing extra the description could reasonably add about parameters it does not have.

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?

States the resource precisely (what has been handed to the ledger) with totals and the outgoing file, which tells an agent this is a historical log of exports rather than a derivation. However, it never names the near-identically named sibling bridge_export, so an agent choosing between the singular and plural tool gets no help from the description.

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 rhetorical question "did the ledger get August?" gives a concrete usage scenario, which is more than most tools offer. But there is no explicit when-not guidance and no mention of alternatives such as bridge_export or bridge_preview, both of which sit in the same namespace.

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