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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), so the description's added value is the disclosure that the response is a complete single-estimate payload including all line items — useful because there is no output schema. It stops short of stating behavior for missing or invalid IDs, but that is a minor gap against strong annotation coverage.

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?

One short sentence with zero filler, and the payload enumeration is front-loaded. It is a noun phrase rather than a full sentence, which is terse but not ambiguous.

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?

With no output schema, the description usefully summarizes the return contents, and the single required param is fully documented in-schema with annotations covering safety. Missing only edge-case behavior (nonexistent ID, permissions), which is modest for a simple read-by-ID tool.

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% and the single parameter is documented as coming from list_estimates, so the schema carries the weight. The description adds no further semantics about the identifier format or scope, which is acceptable at baseline.

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 pairs an implicit retrieval verb with a specific resource and enumerates the payload ('customer, dates, terms, totals and every line item'), so an agent knows exactly what comes back. It does not explicitly contrast with list_estimates or update_estimate, relying on the get_/list_ naming convention to make the distinction.

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 statement of when to call this versus list_estimates, update_estimate, or send_estimate. The only routing hint lives in the schema ('From list_estimates.'), which tells the agent where the ID comes from but not when this tool is the right choice.

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