configure_mcp

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It does mention the merge behavior, which is useful, but it omits critical safety details such as the footgun refusal mechanisms (exposed via allow_footgun_* parameters), the fact that this operation mutates server configuration, and any side effects like requiring a restart. These are not covered by annotations, so the description is significantly under-informing for a mutation 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?

The description is two sentences and front-loads the core action ('Update the configuration'), then adds the merge detail. It is appropriately brief with no filler. It could benefit from a usage note, but the existing text is efficient and structured well.

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 mutation tool with no annotations, no output schema, and multiple safety-related parameters, the description is incomplete. It does not explain when a configuration update is needed, the safety refusal behavior, or the relationship with sibling tools like restart_mcp_process. An agent may call this tool without understanding the risks or the merge semantics beyond a surface level.

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 each parameter already has a description. The tool description adds no parameter-specific meaning beyond what the schema provides. The baseline of 3 is appropriate because the description does not introduce any additional context or clarify how the parameters interact (e.g., the purpose of the allow_footgun_* toggles).

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 states a clear action (update configuration) on a specific resource (existing MCP server), and mentions a distinguishing behavior (merging instead of overwriting). It is clearly distinct from siblings like add_mcp or remove_mcp, though it does not name them. The purpose is unambiguous for an agent.

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 guidance is given on when to use this tool versus alternatives such as add_mcp or restart_mcp_process. It is implied that it modifies existing servers, but there is no explicit context about when a config update is appropriate, whether a restart is needed afterward, or any prerequisites. The agent is left to infer usage context.

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