create_channel

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

No annotations are provided, so the description carries the full behavioral burden — and it delivers well. It discloses what gets created ('channel row and adds creator as a member'), flat topology (no hierarchy), global addressability by name, and required auth capability ('channels'). It even lists all error codes. This is rich behavioral disclosure for a tool with zero annotation coverage.

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 structured with clear labeled sections (When to use, Behavior, Returns, Errors), front-loads the core purpose, and every sentence earns its place. No fluff or redundancy; it's information-dense without being bloated.

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-param tool with 100% schema coverage, no output schema, and no annotations, this description is remarkably complete. It covers return format, error codes, auth requirements, structural semantics (flat, globally addressable), and positional guidance versus siblings. There are no meaningful gaps for an agent to be confused about.

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 coverage is 100% (all 4 params have descriptions in the schema). Despite that, the description adds value by clarifying the name pattern (lowercase, alphanumeric + hyphens) is also echoed in the schema regex, and the agent_token param's optional resolution paths are documented in the schema. The description compensates for auth-related parameter meaning (agent_token) by noting capability requirements, going beyond schema.

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 verb+resource ('Create a named channel for many-to-many topical coordination') and clearly differentiates from siblings by naming alternatives (send_message, broadcast) with use-case distinction. The purpose is unambiguous and distinguishes this tool from the sibling list.

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?

Explicit 'When to use' section gives clear use cases (ongoing multi-agent conversations that persist beyond any single agent's lifetime) with concrete examples (#deploys, #triage). Also explicitly states when NOT to use it ('For 1:1 use send_message. For one-shot fleet-wide announcements use broadcast.'), naming alternatives directly.

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