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

No annotations are provided, so the description carries the full burden and does so well: it discloses the destructive replace-all semantics, that omitted fields silently fall back to defaults, and the required auth scope. It also distinguishes the enforcement fields (which hold every final price) from the search-band fields (which only constrain optimizer/elasticity search), a behavioral distinction not visible in the schema.

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 action, then the field semantics, then the replace warning, then the auth requirement. Every sentence carries distinct information; nothing is redundant with the schema.

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 five-parameter mutation tool with no annotations and no output schema, the description covers the critical unknowns: replace-vs-merge behavior, default fallback, field scoping, and credential requirements. Nothing an agent needs to invoke it correctly is missing.

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 baseline is 3; the description earns an extra point by explaining the differing roles of the parameters — max_change_pct/min_margin_pct/never_below_cost bind every pricing call, while band_lower_ratio/band_upper_ratio apply only when a call sends no minimum or maximum. It does not restate defaults or units, which the schema already covers.

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 ('Save the price guardrails for your workspace') and immediately differentiates itself from the read counterpart by instructing the agent to call get_price_guardrails first. An agent can tell this apart from browse_catalog or compute_price without opening any schema.

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 routes the agent: read get_price_guardrails before saving, and send every rule you want to keep because this is a full replace. It also names the credential/scope prerequisite (Last Price credential with routing write scope), which is exactly the pre-invocation guidance an agent needs.

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