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

Annotations indicate this is a write operation (readOnlyHint: false). The description adds useful behavioral context beyond that: requires API key, costs $0.02, and returns { updated, config }. It also conveys that it modifies configuration, consistent with the annotation. This is sufficient for an update 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?

Three short, information-dense sentences front-loaded with the core action. It covers purpose, usage mode, API key requirement, return shape, and cost without any filler or repetition.

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?

There is no output schema, but the description provides the return shape 'Returns: { updated, config }' and notes cost and API key requirement. It covers the main functional areas (threshold, lists, message, active state) and partial update behavior. Since the schema fully documents each parameter, the description is complete enough for a tool of this complexity.

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% — all five parameters have descriptions. The description offers a high-level summary of parameter types (e.g., 'change reputation threshold, replace whitelist/blacklist') but adds no new semantics beyond what the schema already provides. This meets the baseline for schema-heavy documentation.

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 opens with 'Update your PingShield' and enumerates specific updateable aspects: reputation threshold, whitelist/blacklist, shield message, and pause/resume protection. This makes the tool's purpose unmistakable and distinct from sibling tools like ping_shield_status or ping_shield_check, which read data.

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 clearly states when to use this tool: whenever you want to change PingShield settings. It also provides operational guidance by saying 'Send only the fields you want to change,' implying partial updates. However, it doesn't explicitly mention when not to use it or direct users to alternatives, though that's less critical given the name.

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