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

With no annotations, the description carries full behavioral burden; it does disclose that the operation reads, merges, validates, and retains unedited live fields, which is meaningful mutation context. It does not explain permissions, validation-failure behavior, reversibility, or the significance of the dry_run parameter, leaving clear gaps.

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 sentence with no wasted wording, and the merge/retention behavior is front-loaded. It is concise, though the opening 'Read-merge-validate a PUT request' is implementation jargon rather than a user-facing statement of purpose.

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?

The tool has four parameters, a nested changes object with additionalProperties, no annotations, and 0% schema description coverage; the description explains merge retention but not dry_run behavior or the structure expected in changes. Because an output schema exists, return values need not be explained, but the input-side context remains incomplete.

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 for four undocumented parameters. It indirectly explains the semantics of changes via merge/retention language, but it says nothing about rule_id, company_name, or the dry_run default of true, leaving most parameter meaning unexplained.

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 says 'Read-merge-validate a PUT request' and explains that unedited live fields are retained, which conveys the update/merge mechanism but never names the accounting booking rule resource explicitly. The purpose is inferable mainly from the tool name rather than from a clear verb+resource statement in the description.

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 phrase 'so unedited live fields are retained' implies this tool is for partial updates where existing fields should survive, which gives some usage context. However, it does not state when to choose this over sibling tools such as update_ai_booking_rule or update_bank_transaction_booking_rule, nor does it mention exclusions or prerequisites.

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