update_headline

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It states the action ('Replace') but doesn't disclose whether the operation is reversible, whether it requires authentication, what happens to the previous headline, or what the response looks like. For a mutation tool with zero annotation coverage, this is a significant gap.

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 very short and front-loaded with the action. The Args section is redundant with the schema but not harmful. Every sentence earns its place, though the Args block could be considered unnecessary repetition of the schema.

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 single-parameter mutation tool with no annotations and no output schema, the description is too thin. It doesn't mention authentication requirements, success/failure indicators, or any side effects. An agent would need to infer too much about the expected behavior and response format.

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 0%, so the description must compensate. It does explain that 'headline' is 'The new headline string to set', which adds meaning beyond the schema's bare type/title. However, it doesn't provide constraints like max length, formatting requirements, or whether empty strings are allowed. The description adds some value but not enough to fully 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?

The description states a specific verb ('Replace') and resource ('profile headline'), which clearly distinguishes it from siblings like update_about, update_experience, and update_education. It is concise and unambiguous, though it doesn't explicitly name sibling tools for differentiation.

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 guidance on when to use this tool versus alternatives. It doesn't mention prerequisites like being logged in, nor does it explain when updating the headline is appropriate compared to other profile update tools. The context is implied by the tool name and description but not explicitly stated.

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