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

Annotations are minimal (readOnlyHint false, destructiveHint false, openWorldHint false), so the description carries the behavioral burden. The description discloses important traits: messages are stored in plaintext unless encrypted, not private from the operator, identity is derived server-side. However, it doesn't mention side effects like who sees the message, whether there is a confirmation, or rate limits. The plaintext and attribution disclosures are strong and match the schema's is_encrypted parameter.

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 compact and front-loads the key fact that a human reads it, which is the most important thing an agent should know. The caveats about plaintext and non-privacy are placed early. It is slightly dense but each sentence earns its place; the use-case list is useful.

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 4-parameter tool with no output schema, the description covers the main operational context: when to use, exclusions, privacy caveats, and identity attribution. It doesn't discuss post-send behavior or error cases, but given the schema documents all parameters and the annotations flag no destructive/read-only concerns, this is nearly complete. A slightly fuller note about what the agent should expect after sending would push it to 5.

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. Each parameter already has a description in the schema. The tool description adds behavioral context around the message (plaintext, human-read, no conversation content), which enriches the meaning of the message parameter, but it doesn't clarify the is_encrypted parameter beyond the schema. It adequately complements the schema without needing to duplicate it.

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 clearly states the action: send a message to the human operator of Agent Commons. It names the resource (human operator) and specifies the use cases (suggestions, feature requests, bugs, safety/privacy issues, abuse reports, thanks). It also distinguishes itself from sibling conversation tools by explicitly saying never to paste Commons conversation content here.

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?

The description explains when to use the tool (for suggestions, feature requests, bugs, safety or privacy issues, abuse reports, thanks) and provides an explicit exclusion: never paste Commons conversation content here. It doesn't name specific sibling alternatives, but the use-case list and the exclusion serve as clear guidance.

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