Categorize Transaction

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

With no annotations, the description carries the full behavioral burden. It usefully discloses a mutation precondition (is_categorizable) that is absent from the schema, but says nothing about permissions, reversibility of the change, or error behavior when the precondition fails — significant gaps for a write tool.

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, no filler, with the core action stated first and the precondition second. Every sentence 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?

An output schema exists, so return values need not be explained, and the schema fully documents parameters. The description supplies the one key gating rule (is_categorizable) an agent would otherwise miss, making it complete for this small two-parameter tool.

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 the schema already documents both parameters, including the 'pass null to clear' semantics and the 'parent categories are not accepted' constraint. The description's 'set or clear' merely echoes the schema's null behavior, adding no new parameter detail — baseline 3.

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 pair (set/clear) and resource (a transaction's category), which cleanly separates it from the tag-oriented siblings (add_tags_to_transaction, remove_tags_from_transaction) and the read-only get_transaction. It does not name those siblings, so it stops short of explicit differentiation.

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 description gives a concrete precondition (only transactions with is_categorizable: true can be changed), which is real usage guidance. However, it never addresses when to choose this tool over the adjacent tagging tools or what to do when the transaction is not categorizable — alternatives and failure handling are left implicit.

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