hedera_approve_hbar_allowance

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

The description notes the tool builds an unsigned transaction, implying no side effects, but with no annotations provided, it lacks disclosure of required permissions, signing requirements, or other behavioral traits. Adds moderate context beyond the schema.

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?

A single, concise sentence that efficiently conveys the tool's purpose without redundant information. Every word 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 transaction-building tool with no output schema, the description is minimal. It lacks context on the return value (the unsigned transaction), next steps (signing/submission), and related concepts like approval limits. Adequate but could be more complete.

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 high (75%), and the description does not add new meaning beyond the schema. The description simply restates the purpose without enriching parameter semantics.

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 the tool builds an unsigned HBAR allowance transaction, specifying the action (build), resource (HBAR allowance), and participants (owner, spender). It distinguishes from sibling allowance tools by specifying 'HBAR'.

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?

No explicit guidance on when to use this tool vs alternatives like hedera_approve_token_allowance or hedera_approve_nft_allowance. It does not mention prerequisites, such as the owner account must exist or the need for owner authorization.

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