Fastly NGWAF MCP Server

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It states the tool manages an IP blacklist, implying mutation capabilities (add/remove actions), but doesn't disclose critical details like required permissions, whether changes are reversible, rate limits, or what the response looks like. For a mutation tool with zero annotation coverage, this is a significant gap.

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?

The description is extremely concise with a single phrase, front-loaded and zero waste. Every word earns its place by directly stating the tool's purpose without redundancy or fluff.

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?

Given the tool's complexity (7 parameters, mutation actions, no annotations, and no output schema), the description is incomplete. It lacks details on behavioral traits, usage context, and output expectations, making it inadequate for an agent to fully understand how to invoke this tool correctly in practice.

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?

The schema description coverage is 100%, so all parameters are documented in the schema itself. The description adds no additional meaning beyond the schema, such as explaining dependencies between parameters (e.g., ip and note are for add action, entryId for remove). Baseline is 3 when the schema does the heavy lifting, but the description doesn't compensate with extra insights.

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's purpose as managing an IP blacklist/blocklist, which is a specific verb ('manage') and resource ('IP blacklist'). However, it doesn't differentiate this from sibling tools like 'manage_whitelist' or 'manage_lists' beyond the obvious blacklist focus, and the title is null, leaving some ambiguity about the exact scope.

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 provides no guidance on when to use this tool versus alternatives. It doesn't mention sibling tools like 'manage_whitelist' or 'manage_lists', nor does it specify prerequisites such as needing context defaults for corpName and siteName. This leaves the agent without clear usage context.

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