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

Annotations already declare readOnly, idempotent, non-destructive, closed-world, so safety is covered. The description adds genuine context beyond them: an owner-only access scope, an explicit permission requirement, and the fact that gaps ("Historical remedy:none and missing response window remain visible") are surfaced rather than suppressed. That last point is useful but phrased so cryptically that its behavioral meaning is hard to extract, and nothing is said about the returned state's shape.

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?

It is short and the scoping constraint is front-loaded, so no sentence is padding. But it is written as telegraphic noun fragments rather than sentences, and terms like "Historical remedy:none" and "ordinary prepaid" cost the reader more parsing effort than their length suggests.

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 single-parameter read with no output schema and full annotation coverage, the essentials (safe read, owner scope, permission gate, exclusions) are present. What is missing is any indication of what the acceptance state actually contains – the deliverable's acceptance outcome, the referenced "response window" – forcing the agent to call blind.

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% and the single id parameter is documented with its pattern and owner-scope meaning. The description's "Retained ... deliverable ID" and "matching owner scope" only restate what the schema already says, adding no syntax, format, or lookup guidance beyond it. Baseline 3 applies.

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?

"Owner-only ordinary prepaid A2A deliverable state" names the resource and its scope, but never states the verb – the reader must infer from the tool name that it retrieves state. The negative clause ("Not source-decision agreement or semantic verification") does help separate it from adjacent concepts, and the sibling deliverable_acceptance_submit is implicitly excluded, but the jargon ("ordinary prepaid A2A deliverable") leaves the core purpose vague.

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?

It gives a real prerequisite ("Requires explicit deliverable:read") and several when-not conditions (native/enrolled, Monthly, private v2, browser-only originals are unavailable), which is better than most. However, no alternative tool is named for those excluded cases, so the agent is told what will not work without being routed to what will.

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