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

Annotations declare readOnlyHint=true and idempotentHint=true, so the description doesn't need to restate safety. However, it does add a critical caveat that dealer signs are an assumption, not observed positions – a meaningful behavioral trait. But with no annotations covering every aspect, it does not disclose other traits like how errors are handled, whether it requires rights_confirmed to be true, or what outputs are returned.

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 sentence with two parts: the function and the caveat. It is succinct and front-loaded with the key outputs and inputs. Every word contributes value, and the caveat is placed at the end without bloating length. It is efficient, though slightly terse given the tool's complexity.

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?

Given the tool has 9 parameters, all optional, and no schema descriptions, the description is far from complete. It doesn't explain how to construct a 'user-supplied chain' through source_data, source_text, and source_format, nor does it mention the rights_confirmed parameter's role in confirming rights. The output schema exists, but the description could still benefit from stating that outputs are gamma walls, flip, and max pain. The caveat is useful but insufficient for an agent to call correctly without internal knowledge.

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 0%, and the description mentions only 'SYNTH' and 'user-supplied chain' but fails to clarify how the 9 parameters (e.g., rate, expiry, dividend_yield, rights_confirmed) relate to the computation. The parameter names are generic and self-explanatory, but the description does not clarify the distinction between source_data vs source_text vs data_source, which is crucial for generating a user-supplied chain. With 0% coverage and non-trivial parameters, the description must compensate but does not.

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 clearly states the tool computes gamma walls, gamma flip, and max pain from either SYNTH or a user-supplied chain. This distinguishes it from sibling tools that handle snapshots, plots, and validation, so an agent can infer its purpose as an analytical computation rather than data retrieval or visualization.

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?

There is no explicit guidance on when to use this tool versus alternatives, such as option_chain_snapshot or option_plots. The description implies data source flexibility but does not state when a user-supplied chain is preferred over SYNTH, nor does it mention prerequisites like needing a snapshot first. The sibling tools are not named as alternatives.

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