Fiddler

Fiddler Everywhere MCP Server

The Fiddler Everywhere MCP server is the only programmatic interface Progress Telerik publishes for Fiddler. It is hosted by the desktop application on the loopback interface at http://localhost:8868/mcp over streamable HTTP, authenticated with an API key generated in Settings > MCP Server, and gated to the Pro and Enterprise tiers. It exposes 20 documented tools covering status and login, browser/terminal/network capture, session retrieval and filtering, traffic-rewriting rules, reverse-proxy configuration and LLM agent-call caching. Because the endpoint is loopback-bound it is not reachable by a remote agent: a person must install, license and sign in to Fiddler Everywhere first.

Documentation GitHub

Documentation

📖

APIReference

https://www.telerik.com/fiddler/fiddler-everywhere/documentation/agent-tools/fiddler-mcp-server

📖

Authentication

https://raw.githubusercontent.com/api-evangelist/fiddler/refs/heads/main/authentication/fiddler-authentication.yml

Other Resources

🔗

MCPServer

https://raw.githubusercontent.com/api-evangelist/fiddler/refs/heads/main/mcp/fiddler-mcp.yml

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AgentSkill

https://raw.githubusercontent.com/api-evangelist/fiddler/refs/heads/main/skills/_index.yml

🔗

Conventions

https://raw.githubusercontent.com/api-evangelist/fiddler/refs/heads/main/conventions/fiddler-conventions.yml

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API entry from apis.yml

aid: fiddler:fiddler-everywhere-mcp
name: Fiddler Everywhere MCP Server
description: 'The Fiddler Everywhere MCP server is the only programmatic interface Progress Telerik publishes
  for Fiddler. It is hosted by the desktop application on the loopback interface at http://localhost:8868/mcp
  over streamable HTTP, authenticated with an API key generated in Settings > MCP Server, and gated to
  the Pro and Enterprise tiers. It exposes 20 documented tools covering status and login, browser/terminal/network
  capture, session retrieval and filtering, traffic-rewriting rules, reverse-proxy configuration and LLM
  agent-call caching. Because the endpoint is loopback-bound it is not reachable by a remote agent: a
  person must install, license and sign in to Fiddler Everywhere first.'
humanURL: https://www.telerik.com/fiddler/fiddler-everywhere/documentation/agent-tools/fiddler-mcp-server
baseURL: http://localhost:8868/mcp
baseURL_note: Recorded as loopback deliberately. This is the real, provider-documented base for the server;
  there is no hosted host to substitute, and putting a telerik.com host here would name an endpoint that
  does not exist.
tags:
- MCP
- Agent Tooling
- HTTP Debugging
- Traffic Capture
tags_raw:
- Model Context Protocol
- Agent Tooling
- HTTP Debugging
- Traffic Capture
properties:
- type: MCPServer
  url: mcp/fiddler-mcp.yml
- type: APIReference
  url: https://www.telerik.com/fiddler/fiddler-everywhere/documentation/agent-tools/fiddler-mcp-server
- type: AgentSkill
  url: skills/_index.yml
- type: Authentication
  url: authentication/fiddler-authentication.yml
- type: Conventions
  url: conventions/fiddler-conventions.yml