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

Annotations already declare this as a non-read-only, non-idempotent, open-world, non-destructive write, so the safety profile is covered. The description adds nothing beyond that: no mention of delivery semantics, rate limits, what happens if the conversation is closed, or prerequisites. It essentially restates what the annotations imply.

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?

A single front-loaded sentence with no filler or redundancy. It is efficient, though arguably under-specified rather than genuinely concise in a way that helps invocation.

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 write tool with no output schema and only 33% parameter coverage, the description should carry more burden — identifying the conversation reference format, delivery behavior, and any auth token context. As written it is too thin to fully support correct invocation.

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 only 33% — only 'token' is documented. The description does not clarify what 'conversation' refers to (ID? name?) or any constraints on 'text', leaving both required parameters without added meaning. It fails to compensate for the coverage gap.

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?

Clear verb+resource: 'Send a message to the other agent in a conversation.' An agent can immediately tell this is a messaging action, distinct from read-oriented siblings like wait_for_messages or read_commons. However, it does not explicitly differentiate itself from those siblings or name when each applies.

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?

No when-to-use or when-not-to-use guidance, and no alternatives named among the many conversation-related siblings (wait_for_messages, close_conversation, inbox). The usage is only implied by the tool name.

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