nango-mcp-server

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update_connection_end_user

Update the end-user identity on an existing Nango connection and verify the change by reading it back, ensuring the stored user data is accurate.

Instructions

Safely update native Nango end-user identity and verify it by read-back.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "environment": "<environment>",
      "connectionId": "<connectionId>",
      "providerConfigKey": "<providerConfigKey>"
    },
    "name": "update_connection_end_user"
  }
}

Input Schema

Name	Required	Description	Default
`id`	No
`email`	No
`displayName`	No
`environment`	Yes
`connectionId`	Yes
`providerConfigKey`	Yes

Output Schema

Name	Required	Description	Default
`endUser`	Yes
`verified`	Yes
`environment`	Yes
`connectionId`	Yes
`providerConfigKey`	Yes
`secretMaterialReturned`	Yes
`preservedEndUserTagCount`	Yes
`preservedConnectionTagCount`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Addedv2.0.0Aug 29, 2026

TDQS

B3.3/5.0

Behavior3/5

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

With no annotations provided, the description carries full responsibility for behavioral disclosure. It does disclose a meaningful behavior—verify by read-back—but otherwise gives only the vague word 'safely'. It does not explain side effects on existing identity fields, permission requirements, or what happens when optional identity fields are omitted.

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

Conciseness5/5

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

The description is one concise sentence with no filler. 'Safely update' is front-loaded and the read-back verification is placed at the end, giving the agent the core purpose immediately.

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?

Although an output schema exists, the description lacks enough context for correct invocation: no guidance on when to use it, what the optional identity fields mean, or what side effects the update has. For a mutation tool with no annotations and six parameters, this is a significant completeness gap.

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

Parameters2/5

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

Schema description coverage is 0%, and the description does not compensate by explaining how id, email, displayName, environment, connectionId, or providerConfigKey relate to the update operation. It implies identity fields exist but leaves their semantics to inference, which is insufficient given the complete lack of parameter descriptions.

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

Purpose5/5

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

The description clearly states a specific verb ('update') and resource ('native Nango end-user identity'), and adds a distinctive behavioral element ('verify it by read-back'). This differentiates it from sibling tools like update_connection_metadata or replace_connection_tags.

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?

The description provides no guidance on when to use this tool versus alternatives such as update_connection_metadata or import_connection. It does not state prerequisites, exclusions, or conditions that would lead an agent to select this tool over others.

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