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

No annotations are provided, so the description carries the burden. It discloses important behavior: rail-neutrality with settlementRail as metadata only and never a prerequisite, plus the returned fields (id format saax_<hash>, createdAt, status, settlementRail). It doesn't cover permissions/authorization or idempotency, which would be relevant for a create/persist operation.

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?

Four sentences, front-loaded with purpose, then rail semantics, then return values, then sequencing. Efficient and well-ordered, though the rail-neutrality point is repeated (title says 'rail-neutral', body reiterates it).

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 7 params with nested objects and no output schema, the description compensates well by naming the returned fields. It covers purpose, rail semantics, return shape, and next-step routing. Missing only edge cases like duplicate/idempotency behavior or auth requirements.

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 all 7 parameters including the nested terms/price/recoveryPolicy objects. The description adds value by clarifying the settlementRail semantics ('metadata only, unspecified is valid'), but otherwise the schema does the heavy lifting. Baseline 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?

States a specific verb and resource ('Creates a governed commitment between a buyer and a seller') and names the persistence target (SAAX commitment store). This clearly distinguishes it from the read-only siblings like get_commitment and list_commitments.

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?

Explicitly says 'Call this BEFORE any payment flow' and directs the agent to get_commitment afterward for reading the manifest. Strong sequencing guidance, though it doesn't state when NOT to create a commitment (e.g., if one already exists for this pair).

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