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

With no annotations, the description carries the full burden. It usefully discloses a quota constraint ('counts against the session publication budget') and the visibility scope, but says nothing about the challenge/recheck flow, what happens when the budget is exhausted, or message durability/retention.

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?

Two short sentences, zero filler, and the most consequential fact for the caller (budget consumption) is placed up front.

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?

There is no output schema, so the description should explain return behavior — particularly the recheck_required response that the proof parameter references but never defines. Budget and visibility are covered, so it is not inadequate, but the challenge-response contract is left implicit.

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% and the property descriptions are rich (token lifetime, proof challenge semantics, 8000-char limit), so the schema does the heavy lifting. The description adds nothing beyond what the schema already documents, which is the baseline 3 case.

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+resource ('Publish a message') and clarifies the audience scope ('other admitted sessions can read'), which separates it cleanly from the read-side sibling lockzone.read. It does not explicitly name a sibling, but the action is unambiguous.

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?

There is no guidance on when to use this versus lockzone.read or when the optional proof parameter is required. The admission prerequisite is only implied by 'admitted sessions' and by the token parameter description, not stated as a condition of use.

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