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

Annotations already declare readOnlyHint=false and destructiveHint=false, setting the mutating-but-not-destructive baseline. The description adds that updates are applied per item but does not disclose behavior like whether omitted fields are left unchanged, partial failure handling, or limits on batch size. It is adequate but not rich.

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?

Two sentences, zero filler. The action and scope come first, the field list is compact, and the routing guidance is immediately relevant. Every clause earns its place.

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 single-parameter bulk update tool with a simple inline schema and no output schema, the description provides the essential calling context: what to update, how to batch, and the alternative for single updates. Missing only minor details like partial-failure behavior and whether omitted fields are untouched, which are not critical for a straightforward update.

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. It names all updatable fields (description, date, value, ignored, notes, deleted), which helps, but it does not explain the required 'id' field's role as the transaction identifier or clarify semantics like 'deleted: true' meaning soft-delete. It adds some meaning over the bare schema but does not fully carry the burden.

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 clearly states a specific verb and resource: 'Update many transactions in one call', and enumerates the exact fields (description, date, value, ignored, notes, deleted). It immediately distinguishes itself from the single-transaction sibling update_transaction, leaving no ambiguity about what this tool does.

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?

Explicit usage guidance is given: 'prefer this over repeated single-transaction updates' and 'For a single transaction use update_transaction.' This clearly instructs an agent when to use this bulk tool and when to route to the alternative, with no inference needed.

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