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

Adds real behavioral context beyond the annotations: canned/fixed AAPL data, a 10/day/IP rate limit, and no payment requirement. It doesn't describe what the digest contains or how truncation/limits manifest in output, but the safety profile is already covered by readOnlyHint.

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 the core purpose, then constraints, then cost. Nothing redundant.

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 no-parameter, no-output-schema demo tool, it covers purpose, data scope, quotas, and cost. What's missing is a hint of the digest's content/shape, which matters since 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?

Zero parameters, so baseline 4 applies. The description usefully explains the absence of parameters by noting the ticker is fixed to AAPL in a canned demo.

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 resource (SEC EDGAR filing digest) and scope (free canned demo, AAPL only), which separates it from the general sibling filings_digest by implication. It never names the sibling, so full differentiation is left to inference.

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 'free canned demo' framing and per-IP quota make the intended use (trying the digest without payment) clear. It stops short of explicitly telling the agent to call filings_digest for real or non-AAPL data.

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