payments_update_prescription

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

There are no annotations, so the description carries the full behavioral burden. It only states that an update occurs; it does not reveal whether fields are partially or fully replaced, whether state transitions are validated, whether updates are reversible, or what permissions/effects are involved. For a mutating tool with 13 parameters, this is insufficient behavioral disclosure.

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 single clear sentence with no filler, and the verb-object structure is front-loaded. It is efficient in length, though the minimization comes at the cost of substantive details already penalized elsewhere. Structure is clean and readable.

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 an update operation with 13 parameters, no annotations, and no output schema, this description is far too thin to support correct invocation. An agent would not know what fields are updatable, what constraints apply, what the response looks like, or how this relates to create/delete flows. Substantial context is missing.

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 only 15%, and the description adds no parameter-specific meaning beyond the schema. With 13 parameters and most left undocumented, the description needed to compensate by explaining key fields such as state, amount, direction, person_list, or related prescription IDs. It does none of this.

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 uses a specific verb ('Update') and resource ('payment prescription'), and 'existing' clarifies it targets already-created prescriptions. This distinguishes it from payments_create_prescription and payments_delete_prescription, and the resource term separates it from payments_update_payment. It does not, however, articulate any additional scope or field-level intent.

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 explicit when-to-use or when-not-to-use guidance is provided, and no alternative tool is named. The word 'existing' weakly implies this tool is for modifying a prescription that has already been created, but there is no discussion of when update is appropriate versus create or delete. This is at best implied usage.

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