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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world, so the safety profile is covered. The description adds genuine value by disclosing the return contents (no output schema exists) and the blocking interaction workflow, but it doesn't say whether responses are truncated, paginated, or how often to poll.

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 returned, followed by when to use it, then the conditional follow-up workflow. No filler and no repetition of the title or annotations.

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 carries responsibility for describing returns and does so field by field, plus it documents the multi-step interaction-resolution workflow. For a single-parameter read tool that is everything an agent needs to call it and act on the result.

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?

There is a single required parameter, sessionId, and the schema supplies only its type and uuid format with 0% description coverage. The description never clarifies where sessionId comes from (presumably returned when starting a session), so it neither compensates for the coverage gap nor misleads; with one trivially obvious parameter this is adequate but not additive.

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 (retrieve) and resource (Replo session) and enumerates exactly what is returned: status, latest response, tool activity, errors, and pending interactions. This clearly separates it from siblings like abort_agent_session and resolve_agent_interaction, which mutate or resolve rather than fetch.

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?

Gives an explicit use case ("check progress after starting or continuing a session") and a concrete conditional branch: when pendingInteractions is non-empty, surface them to the user and then route to resolve_agent_interaction. It even specifies the argument shape for the follow-up call, so the agent knows both when to call this and what to do with the result.

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