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

Annotations declare a non-read-only, non-idempotent, non-destructive, closed-world write. The description adds the key value that this is an ERC-7579/ZeroDev scoped grant and that it requires an API key. However, it omits what the issued key enables, its irreversibility or revocation, and the auth model beyond 'API key'.

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 front-loaded sentence that enumerates scope and states the prerequisite compactly, with no filler. It is terse to the point that some necessary detail is absent, but 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 4-parameter mutation tool with no annotations on auth and no output schema, the description covers the concept and one prerequisite but misses parameter details, especially the required agentId, and gives no return-value or lifecycle context.

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 the fields semantically via phrases ('time limit', 'USDC spend cap', 'target whitelist'), which loosely maps to ttlHours, maxUsdc, and target. But agentId (the sole required parameter) is never mentioned, and no formats, units, defaults, or ranges are given.

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 ('Issue'), a precise resource ('ERC-7579 / ZeroDev-scoped session key'), and enumerates the scope constraints (time limit, USDC spend cap, target whitelist). This is clearly distinct from the read-only get_smart_account_info and the execution/simulation siblings.

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?

Provides one prerequisite ('Requires an API key') but never states when to use this tool vs alternatives. It does not indicate that a session key is a prerequisite for execute_onchain_intent, nor how it relates to dry_run_simulation, leaving sequencing to inference.

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