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

Annotations already declare destructiveHint=false, openWorldHint=false and readOnlyHint=false, so the safety profile is partly covered. The description adds real value by disclosing that nothing is searched and nothing is charged, plus the shape of the return (pairs, alternatives, conflicts, missing values); however, it never says the call persists a reconciliation draft, which is what readOnlyHint=false implies and is the main behavioral fact an agent needs.

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?

Five tight sentences, front-loaded with the operation and the matching model, then the return shape, then caveats. 'No search and no charge' is terse to the point of being cryptic, but nothing is redundant.

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?

A 10-parameter nested tool with no output schema and no param descriptions needs more than this. The rule/veto matching logic and return contents are covered, but fill mappings, assignment mode (one_to_one vs many_to_one), private-field inclusion, and request/project scoping are unexplained, which leaves gaps an agent would hit in practice.

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% across 10 parameters, so the description must carry the load. It does explain the core matching semantics — OR-of-groups where 'every rule in one group agrees', exact vs close-spelling rules, and veto/conflict fields that rule a pair out — but it never uses the parameter names groups, vetoes, fill, assignment, threshold_bps, or include_private_fields, leaving roughly half the surface undocumented.

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 outcome: 'Proposes which rows in one list correspond to rows in another list,' which an agent can distinguish from apply_reconciliation by the 'proposes' framing. It never names the sibling explicitly, so the contrast with the committing tool is inferred rather than stated.

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?

There is no when-to-use/when-not-to-use guidance and no mention of alternatives such as apply_reconciliation or get_reconciliation. 'No search and no charge' is a cost/scope signal, not a routing instruction, and prerequisites such as project_id or collection scope are left unaddressed.

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