update_a_custom_field_value

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

Annotations already provide write (readOnlyHint=false), idempotent (idempotentHint=true), and non-destructive (destructiveHint=false). Description repeats 'Idempotent' and 'updates data' but adds no new behavioral insight like permissions, error cases, or side effects.

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?

Concise with two short sentences plus a header line. Front-loads key info (verb, resource, endpoint). The emoji and 'WRITE' label are slightly extraneous but not harmful.

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 simple update tool, the description covers resource type, idempotency, and HTTP method. No output schema exists, so return value is omitted. Lacks prerequisites or error handling, but sufficient for typical use.

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%, so baseline is 3. Description does not elaborate on parameters (id, body) beyond what the schema provides, adding no additional semantics.

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?

Clearly states it updates a custom field value, with resource 'Account Custom Field Data' and HTTP method PUT. The description distinguishes it from sibling tools like update_a_custom_field_value_for_contact by specifying account context.

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?

Implies usage for account custom field values via 'Account Custom Field Data', but no explicit guidance on when to use this tool over alternatives like update_a_custom_field_value_for_contact or bulk updates. Lacks when-not-to-use instructions.

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