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Evolution API MCP Server

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evolution_instance_connect

Connect a WhatsApp instance by generating a QR code or pairing code for authentication.

Instructions

Connect an instance and get the QR code / pairing code.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
numberNoPhone number for pairing-code connection.
instanceNoWhatsApp instance name. Optional if EVOLUTION_DEFAULT_INSTANCE is configured.
Behavior2/5

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

With no annotations provided, the description carries full burden but only mentions output. It does not disclose side effects (e.g., disconnecting existing connections), required authentication, or rate limits, which are critical for a connection-related tool.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is very concise with no wasted words. It front-loads the action and output. While slightly more detail could improve completeness, it is appropriately sized for a simple tool.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Despite 100% schema coverage, the description lacks details on return format for the QR/pairing code, which is unhelpful without an output schema. No guidance on how the output is presented (e.g., URL, text) or what to do with it.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% with both parameters described. The description adds no additional meaning beyond the schema, so baseline score of 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool connects an instance and returns a QR code/pairing code. This specifies the action and output, distinguishing it from related sibling tools like 'evolution_instance_connection_state' which checks connection status.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance on when to use the tool versus alternatives (e.g., 'evolution_instance_create' for creation) or prerequisites (e.g., instance must exist). The description lacks context for appropriate usage.

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

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