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

Annotations already flag readOnlyHint=false, destructiveHint=false, but the description adds real substance: one token consumed per call, an XBOSS task is created and the result stored, and the call is explicitly not pure read-only even when the source lookup is. The full idempotency-key lifecycle (generate before first request, reuse only to recover a lost response, new key for new execution) is behavior an agent cannot get from annotations. Minor deduction because 'not pure read-only' sits in slight tension with the schema's 'Nothing is saved or submitted', leaving the agent to reconcile what actually persists.

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 auth prerequisite is front-loaded, which is good, but the purpose sentence is pushed to second position behind idempotency rules. Three sentences of generic idempotency boilerplate plus the garbled phrase 'not available to anonymous taste calls' crowd out the actual what-it-does information for a tool with only two optional parameters.

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 non-destructive validator with no output schema, the definition covers the essentials: auth precondition, per-call token cost, side effects beyond the source system, and idempotency handling. Return-value shape is handled by the schema description (missing_required_fields, field_errors), so the description need not repeat it. What is missing is how this fits the broader init/validate/save sequence.

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 account_link_id is already fully documented and the baseline would be 3. The description goes beyond that by explaining how request_idempotency_key must be used across retries and by warning that a provider-specific idempotency_key is a different field — semantics the schema only defers to with 'see the tool description'.

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?

States a specific verb and resource: 'Validate employee qualification loss draft without submission.' The 'without submission' qualifier implicitly separates it from the los_save sibling, and the schema description ties it to the form opened by los_init. It stops short of naming an alternative tool explicitly, which keeps it at 4 rather than 5.

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?

Gives one hard precondition ('REQUIRES prior fourinsure__session__login call with same account_link_id'), which is genuinely useful usage context. However it never says when to choose this over los_save, los_exist_check, or los_init, so the agent must infer the validate-then-save workflow from tool names alone.

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