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

Annotations declare readOnlyHint=false, destructiveHint=false, idempotentHint=false and openWorldHint=false, so the safety profile is already provided structurally. The description adds nothing beyond this — no mention of required permissions, whether partial updates overwrite unspecified fields (relevant given all params are optional and idempotency is false), or any 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?

Three words is concise but here it reflects under-specification rather than economy. Nothing is front-loaded because nothing is provided.

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 mutation tool with 7 optional parameters, no annotations detail, and no output explanation needed (output schema exists), the description leaves too much to inference — especially the non-idempotent partial-update semantics implied by the annotations.

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% across all 7 properties, so the schema fully documents each field. The description contributes no additional parameter meaning, which is acceptable given the baseline of 3 when the schema does the heavy lifting.

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 just restates the tool name: 'Update billing details' adds no specific verb-object detail beyond what the identifier already conveys. It does not say what fields are updatable, what entity's billing details (org, workspace, user), or distinguish it from fetch_billing_details.

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?

No when-to-use guidance, no prerequisites, and no mention of the sibling fetch_billing_details as the read counterpart. The agent must infer usage entirely from the name.

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