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

The description adds substantial behavioral context beyond the annotations: it discloses that submission starts the buyer-acceptance window, that re-submitting a revision restarts it, that files land on object storage, and that secrets are envelope-encrypted and readable only by the buyer. These side effects and data-handling guarantees are exactly the kind of information the sparse annotations (readOnlyHint=false, idempotentHint=false) do not convey.

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?

Three sentences with zero filler. The core purpose is front-loaded ('Seller-side: submit the deliverable on a paid/in-progress quote'), followed by the kind taxonomy and then the two special data-handling cases and the acceptance-window side effect. Every sentence earns its place and the density is appropriate for a tool with 9 parameters.

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 complex 9-parameter tool with no output schema, the description covers a remarkable amount: all four kind variants, size limits, storage/encryption behavior, and the acceptance-window side effect including revision behavior. The main gaps are that it does not hint at what the response contains (no output schema exists to fill that gap) or describe failure preconditions beyond 'paid/in-progress quote'.

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 coverage is 100%, so the baseline is 3, but the description adds real meaning beyond the schema: it clarifies that the 25 MB limit applies to decoded file size (not the base64 string), groups file_b64 with file_name and file_mime_type as a cohesive set, and explains the practical consequence of the secret kind (encrypted, buyer-only) and file kind (object storage). The inline 'kind=url|text|file|secret' summary reinforces the enum without repeating the schema verbatim.

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 (submit), a specific resource (deliverable on a paid/in-progress quote), and a clear actor (Seller-side). It is immediately distinguishable from siblings like services_submit_quote (quote submission phase) and services_acknowledge_delivery (buyer-side confirmation), so an agent can tell what this tool does without opening the 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?

The description gives clear context for when the tool applies — seller-side, on a paid/in-progress quote — and implies it is used after a quote is accepted and work has begun. However, it never names alternatives or exclusions, such as explicitly contrasting with services_submit_quote or services_start_work; the routing to the right sibling is left to inference.

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