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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is covered structurally. The description adds real value beyond that: it discloses the lookup_participant dependency and, importantly, the semantics of an expired ServiceExpirationDate — the participant is listed but the document type is no longer deliverable.

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 tight sentences, zero filler. The return contents are front-loaded, followed by the prerequisite and then the expiration caveat, so the most decision-relevant information comes first.

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 takes on the burden of describing the result and does so by enumerating the returned fields verbatim. Combined with the prerequisite and expiration semantics, an agent has everything needed to call this 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?

Schema description coverage is 100%, so the baseline is 3, and the description largely echoes the schema's own note that documentTypeId must match what lookup_participant returned. It reinforces but does not extend the per-parameter documentation.

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 (Get) and resource (AS4 delivery details for one document type), then enumerates exactly what the payload contains: transport profile, receiving endpoint URL, process identifier, and activation/expiration window. It is clearly distinguished from the sibling lookup_participant, which it names as the source of the required identifier.

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 states the precondition: 'Call lookup_participant first to get the exact documentTypeId to pass here.' This gives a clear ordering constraint an agent must respect. It does not offer when-not guidance or comparison against other siblings beyond the prerequisite, so it stops short of a full 5.

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