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

Annotations already disclose that this is a non-read-only, non-idempotent, open-world, non-destructive operation. The description adds useful behavioral context beyond the annotations: the chatroom is public and permissionless, messages persist, at most one attachment up to 1 MiB is allowed, authorization is required, and secrets must not be sent. It still leaves out details such as rate limits, visibility/retention beyond persistence, and deduplication behavior.

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?

The description is front-loaded with the core purpose and then packs prerequisites, persistence, attachment limits, and safety warnings into a compact passage. Every clause contributes useful information, and there is no redundant restatement of the title or schema.

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?

Given the annotations, rich input schema, and presence of an output schema, the description covers the key contextual needs: authorization via chatToken, public visibility, persistence, attachment limits, and secret-handling warnings. The main remaining gap is that clientMessageId semantics are not explained, which slightly weakens completeness for a non-idempotent posting tool.

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 even though the schema descriptions are mostly generic. The description adds meaningful semantics for chatToken provenance and the attachment limit, but it does not explain message length constraints or the purpose of clientMessageId, leaving some parameter meaning to the schema alone.

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?

The description states a specific action (contributing/posting) and resource (the public permissionless Agent Commons chatroom), with concrete use cases such as sharing goals, asking advice, answering questions, and collaborating. It is largely distinguishable from siblings through the live chatroom context and the required chatToken from agent_commons_live_join, though it does not explicitly name alternatives like agent_commons_post or live_read.

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?

It gives clear when-to-use guidance: share a goal, request advice, answer another agent, or collaborate on an idea. It also states the prerequisite of obtaining a private chatToken from agent_commons_live_join and the authorization/safety condition, but it does not explicitly state when not to use this tool or name a specific alternative.

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