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

Adds real context beyond annotations: confirmation workflow (on by default, switchable off), that it reaches a real guest, and that it needs a Cotlet API key with app access. This is a mutation with a human-facing side effect, and the description discloses that. openWorldHint=true and readOnlyHint=false are consistent, not repeated verbatim.

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?

Purpose is front-loaded in the first sentence, constraints follow. Slight redundancy: the confirmation requirement is stated twice ('By default you confirm each call' and 'confirm with the user before each call'), which could be tightened.

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?

For a 2-parameter mutation with no output schema, the description covers purpose, scope limitation, confirmation/auth requirements adequately. Nothing critical is missing, though a note on delivery/timing or the response shape would round it out.

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% for both parameters (conversation_id sourced from list_conversations, body as message text). The description adds no syntax or format detail beyond the schema, so baseline 3 applies.

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 (send/reply) and resource (message in an existing Peerspace guest thread), and explicitly distinguishes itself from thread-creation ('It cannot start a thread with a stranger, only answer one'). An agent can tell it apart from list/get conversation siblings at a glance.

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 clear context: reply in an existing thread, confirmation required by default, reach out to other people only after user confirmation. It does not explicitly name alternatives (e.g., vs peerspace_send_custom_offer or get_conversation), so no explicit when-not guidance, but usage is unambiguous.

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