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

No annotations exist, so the description carries the full burden, and it delivers non-obvious context: listed availability does not guarantee historical coverage, and submission validates the chosen window. It also prescribes a confirmation workflow before saving or running. Missing only return shape and any read-only/pagination characterization, which "list" implies but does not state.

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?

Front-loaded with the purpose, then layered caveats. The last two sentences overlap somewhat ("do not force a selection step" vs. "suggest an available match and obtain confirmation"), but both address distinct risks and nothing is pure filler.

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 one-parameter read tool with no annotations and no output schema, the description covers what is returned (venue and quote-token options), when to call it, and the key caveat about historical coverage. Only the concrete returned fields and any pagination behavior are left unstated, which is a minor gap.

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?

There is a single parameter (asset) with 100% schema description coverage providing an example format, so the schema already does the work. The description adds no meaning about the asset parameter itself, matching the baseline for fully documented schemas.

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 a specific verb and resource pair — list execution venue and quote-token choices — scoped explicitly to backtests, which separates it from generic venue tools like list_exchanges. It never names an actual sibling, so sibling differentiation is implied by scope rather than stated.

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?

Gives both a use trigger ("user wants alternatives or market details are missing") and an explicit when-not ("A complete supplied or recorded market is already the default: do not force a selection step"). It stops short of naming a specific alternative tool for the fully-specified case.

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