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

Annotations already cover safety (readOnly, idempotent, non-destructive, closed-world), so the description is free to add real context: the grading lookback (calls made 14 days earlier), the inclusion of the next run start time, and the mandatory not-advice line and run date. That is meaningful behavioral disclosure beyond structured fields, with no contradictions.

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?

It is front-loaded with the purpose, but the whole definition is a single run-on sentence packing four distinct output elements plus a trailing formatting instruction ('Show the not-advice line and the run date with the answer'). Every clause carries content, yet the lack of structure makes it harder to scan than a short bulleted enumeration would be.

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 an output schema present and annotations covering safety, the description's job is to set expectations about content and it does so thoroughly, including report timing. Only the relationship to sibling tools is left unaddressed.

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 tool takes zero parameters, so the baseline is 4; there is nothing for the description to disambiguate. It correctly avoids wasting words on nonexistent inputs.

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 enumerates the concrete content of the report (band changes on the market map, the biggest movers, calls graded last night, next run start), so an agent can tell it produces a daily recap rather than a lookup. However, it never names or contrasts the neighbouring tools it overlaps with conceptually (market_map, stock_call), leaving the boundary to be inferred.

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?

Usage is only implied by the temporal framing ('what changed ... last night'), which suggests a once-a-day recap. There is no explicit when-to-use, when-not-to-use, or alternative named, and no statement such as 'use market_map for current bands' to route the agent.

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