Update custom channel message status

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

With no annotations provided, the description carries the full burden of disclosing behavioral traits. It implies a mutation through 'Update' but does not describe side effects, reversibility, authorization needs, or error handling. The only extra detail is the conditional error message for FAILED status, which is minimal.

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 a concise two-sentence summary, front-loaded with the main purpose and then a helpful conditional note. Every sentence earns its place, with no redundant or irrelevant information.

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 lack of annotations and output schema, the description is incomplete for a mutation tool. It does not explain return values, potential errors, preconditions, or the impact of the update. The agent lacks critical context for safe and correct usage.

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. The description recounts the enum values and the conditional error message parameter, but does not add meaning beyond what the schema already provides. It adds no new semantic depth.

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 specific action (update delivery status) and the resource (message within a custom channel), enumerating the allowed statuses (SENT, FAILED, READ). This distinguishes it from sibling tools like UpdateConversationThread or SendConversationMessage, which serve different purposes.

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 provides no explicit guidance on when to use this tool versus alternatives. It only mentions a conditional parameter usage for FAILED messages, but does not set it apart from other update tools or specify scenarios where it should or should not be used.

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