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

With no annotations, the description carries the full burden, and it does disclose output contents (added/removed/changed items with quotes, XBRL changes, riskDelta), payload-size option, and cost ($0.05). That is useful context, but it omits mutation/read safety framing and references mode/compact flags absent from the schema, which muddies trust.

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 core question and kept to a few tight sentences; the value framing ('saves reading two full risk sections') is effective. The trailing $0.05 and mode/compact clauses are borderline but brief.

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 3-parameter tool with no output schema and no annotations, the description usefully explains what is returned, so return values are adequately covered. The unresolved references to mode=diff and compact=true, which are not in the schema, leave an agent unable to actually invoke those options, a meaningful completeness 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?

Schema description coverage is 100%, so the ticker/filingType/question semantics are already carried by the schema, giving a baseline of 3. The description adds no parameter-level detail and instead names two non-existent parameters (mode, compact), so it does not improve on the schema.

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 (10-K/10-Q risk-factor diff) and scope (latest vs prior filing), so an agent knows the operation well. However, it never distinguishes itself from the near-identical sibling analyze_sec_filing, leaving a real ambiguity for selection.

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?

'Use mode=diff' is the only usage cue, and it references a parameter that does not exist in the schema. There is no when-to-use vs alternatives guidance and no condition that would route an agent to analyze_sec_filing instead.

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