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

There are no annotations, so the description carries the full burden of behavioral disclosure. It mentions that results include sources and that changes are filtered to 'most important,' but it does not explain how importance is determined, how results are ordered or limited, whether data is read-only, or what the output structure will be beyond what the output schema may already provide.

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, efficient sentence with no filler. It front-loads the core action and resource, though it could be slightly more structured to mention the lookback period and source behavior without becoming verbose.

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?

The presence of an output schema reduces the need to explain return values, and the schema covers both parameters. However, with several closely related sibling tools, the description lacks explicit routing guidance and clarity on what 'most important' means, leaving the agent to infer when this tool is the right choice.

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 schema already documents the ticker and period parameters. The description adds no new parameter-level meaning beyond the general 'changes' context, so the baseline of 3 is appropriate.

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 uses a specific verb ('Find') and identifies a resource: important recent changes across financial, filing, risk, and insider categories, with sources. This distinguishes it from narrower siblings like financial_changes, latest_filings, and risk_factor_changes, though it does not name the siblings explicitly and 'most important' remains somewhat subjective.

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 description implies this tool is for getting an aggregated, sourced view of multiple change types, which gives some usage context. However, it does not explicitly say when to prefer this over financial_changes, latest_filings, insider_transactions, or risk_factor_changes, nor does it state any exclusions or alternative routes.

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