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

With no annotations provided, the description carries the full burden of behavioral disclosure. It does add useful constraints: only the provider agent can call it, and the output must conform to the service's output_schema. However, it does not mention side effects (e.g., whether it marks a transaction as complete), failure behaviors, or any state changes, leaving some behavioral ambiguity for a state-mutating tool.

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?

The description is two concise sentences, front-loaded with the primary action and followed by two critical constraints. Every sentence earns its place: the first states the core purpose, the second adds access control and a data format requirement. No wasted words or redundant information.

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?

The tool is simple (2 params, no output schema, no nested objects), and the description covers the essential purpose, access control, and data constraint. However, it does not describe what the tool returns or any side effects (e.g., updating a transaction record). Given the simplicity, this is a minor gap, but the description is mostly complete for an agent to select and invoke the tool correctly.

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?

The schema already provides 100% coverage for both parameters (output and transaction_id), so the baseline is 3. The description adds no new meaning beyond restating the output schema constraint, which is already documented in the parameter descriptions. There is no additional insight into formats, defaults, or relationships between parameters.

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 clearly identifies the action ('Deliver the output') and the resource ('a service execution'), making it distinct from sibling tools like ae_verify_output (which likely validates output) and ae_create_transaction (which starts a transaction). The additional statement 'Only callable by the provider agent' further narrows its role, providing a clear, specific purpose.

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 supplies a clear usage context: this is the step to deliver output after service execution, and it is restricted to the provider agent. While it does not explicitly name alternative tools or state when not to use it, the context is clear enough for an agent to infer the appropriate scenario, and the provider-only restriction serves as a key guideline.

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