Multilead Open API MCP Server

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

No annotations are provided, so the description must fully disclose behavioral traits. It states the action 'sends a reply' which implies a write operation, but doesn't mention authentication needs, rate limits, side effects, or what 'Sent email reply details' includes. For a mutation tool with zero annotation coverage, this leaves significant behavioral gaps.

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 appropriately sized with a clear purpose statement followed by parameter and return sections. However, the second sentence 'This sends a reply to an existing email conversation thread' is somewhat redundant with the first. Overall structure is good but could be more efficient.

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 7 parameters with 0% schema coverage and no annotations, the description provides basic parameter listing and states there's an output schema (which handles return values). However, for a mutation tool that sends emails, it lacks crucial context about permissions, error conditions, and behavioral details that would help the agent use it correctly.

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 schema provides no parameter documentation. The description lists all 7 parameters with brief labels, adding basic semantics beyond the schema. However, it doesn't explain parameter relationships, formats, or constraints (e.g., what thread ID format, whether lead_id must match thread). This partial compensation justifies a baseline score.

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 verb 'send' and resource 'email reply to an existing thread', making the purpose evident. It distinguishes from sibling 'send_new_email' by specifying it's a reply to an existing thread, though it could be more explicit about this differentiation. The title is null, so the description carries the full burden.

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 like 'send_new_email' or other communication tools. It mentions it's for replying to an existing thread, but doesn't specify prerequisites, constraints, or when not to use it. The agent must infer usage from context alone.

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