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

Annotations already declare this a safe, idempotent read, so the safety bar is low. The description still adds real context: it is an 'authorized' read with an access precondition, and the warning that 'a handoff receipt is not proof of provider completion' tells the agent how to interpret returned evidence. It does not cover pagination behavior, though the schema's cursor/limit params do.

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, front-loaded with what is read, then how to obtain the id, then the interpretive caveat. Every sentence carries information. The 'handoff receipt' sentence is slightly dense but earns its place as a warning.

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 an output schema and rich read-only annotations, the definition needs only purpose, id provenance, and usage routing — all present. The one gap is the relationship to get_thread and list_act_history, which an agent must infer.

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 schema already documents actRequestId, threadId, limit, cursor and includeThreadState. The description only reinforces that actRequestId comes from act. Baseline 3 is appropriate when the schema carries the parameter burden.

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 and resource: 'Read an authorized Act request and current child-thread messages, actions and pending requests.' That enumerates the payload contents clearly. It does not explicitly distinguish itself from the sibling get_thread, which reads a thread without the Act-request framing, so sibling differentiation is only implied.

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?

Says to use the actRequestId returned by act, and to continue the selected thread through act rather than this read tool. That gives a clear entry condition and a routing hint away from mutating work. It never says when to prefer this over get_thread or list_act_history, so no explicit exclusion is offered.

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