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

With no annotations, the description carries the full burden, and it does disclose genuinely useful behavior: idempotent replay semantics for request_id, session isolation, a seven-day lifetime, and the absence of model inference (implying low cost/latency). It stops short of stating auth requirements, failure modes, or what the call returns, which for a creation tool with zero annotation coverage leaves meaningful gaps.

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 short sentences, each earning its place: what is created, the idempotency contract of the one parameter, and the absence of inference cost. Front-loaded and free of filler.

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 (one param, no nesting, no output schema), so the bar is modest, and the description covers the creation semantics and idempotency well. However, with no output schema present, the description should say what a successful call returns (e.g., a session identifier) and what the seven-day expiry means for subsequent calls; those omissions leave the agent guessing about the return contract.

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 0%, so the description must compensate, and it does: it tells the agent request_id must be unique and that replaying the same value returns the same session rather than creating a duplicate. That is real semantic value the schema (a bare uuid string) does not convey.

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?

"Create an isolated seven-day offer conversation" gives a specific verb (create) and resource (conversation) with scope modifiers (isolated, seven-day). It is clear what the tool does, though it never names a sibling or explains how it differs from setup-adjacent tools like send_message or assess_offer_readiness.

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?

Usage is implied: an agent can infer this is the entry point that must precede conversation-scoped tools, and "No model inference" hints it is a cheap setup call. But there is no explicit when-to-use or when-not-to-use statement, no prerequisite chain naming the siblings it enables, and no guidance on what to do if a session already exists.

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