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

Annotations already declare the safety profile (readOnlyHint, idempotentHint, non-destructive, closed-world), so the bar is lower. The description still adds real context beyond them: the two-part return shape (Markdown document plus short JSON summary), the full inventory of document sections, and the conditional rule that with no commitment-level evidence the build start is deferred until after the test decision date.

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 purpose and return format are front-loaded in the first sentence, which is good structure. However, the middle sentence is a sprawling ~90-word comma-separated inventory of document sections that reads as a wall of clauses; it is informative given the missing output schema but could be tightened considerably.

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 26-parameter, nested-object tool with no output schema, the description compensates well on the output side by enumerating exactly what the returned document contains. The remaining gap is the absence of any routing guidance relative to the five sibling tools that cover overlapping sub-steps of the same method.

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 81% with 26 parameters, so the schema does the heavy lifting and a baseline of 3 applies. The description only touches parameter meaning indirectly through the commitment-level-evidence scheduling rule (relevant to `evidence`), adding no syntax or default detail beyond what the schema already documents.

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 states a specific verb and artifact: 'Run the full Idea to Product method on one idea and its feature list and return a Scope and Sequence plan as a Markdown document, followed by a short JSON summary.' The 'full method' framing implicitly distinguishes it from the narrower siblings (cut_mvp, sequence_build, validation_plan), but no sibling is named explicitly, so the routing signal is inferential rather than stated.

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 guidance on when to call this composite tool versus the single-step siblings, nor any prerequisite or exclusion. The one conditional sentence ('When there is no commitment-level evidence yet...') describes internal scheduling behavior, not when an agent should choose this tool over alternatives.

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