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Closing the Loop: A Self-Evolving Defense
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Logfire MCP Server
for AI Agents

Connect your AI agent to StackOne's Logfire MCP server and give it 30 MCP tools out of the box. Auth, tool execution, and security all managed.

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Logfire MCP Server
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30 Agent Actions

Create, read, update, and delete across Logfire — and extend your agent's capabilities with custom actions.

MCP Actions → Build Actions →

Authentication

Agent Tool Authentication

Per-user OAuth in one call. Your Logfire MCP server gets session-scoped tokens with zero credentials stored on your infra.

Agent Auth →

Security

Agent Protection

Every Logfire tool response scanned for prompt injection in milliseconds — 88.7% accuracy, all running on CPU.

Prompt Injection Defense →

Performance

Max Agent Context. Min Cost.

Free up to 96% of your agent's context window to enhance reasoning and reduce cost, on every Logfire call.

Tools Discovery →

What is the Logfire MCP Server?

A Logfire MCP server lets AI agents read and write Logfire data through the Model Context Protocol — Anthropic's open standard for connecting LLMs to external tools. StackOne's Logfire MCP server ships with 30 pre-built actions, fully extensible via the Connector Builder — plus managed authentication, prompt injection defense, observability, and agent execution runtime. Connect it from MCP clients like Claude Desktop, Claude Code, Cursor, Goose, and VS Code, or from agent frameworks like OpenAI Agents SDK, LangChain, and Vercel AI SDK.

All Logfire MCP Tools

Every action from Logfire's API, ready for your agent. Create, read, update, and delete — scoped to exactly what you need.

Projects

  • Create Project

    Create a new project

  • List Projects

    List all projects accessible to the authenticated user

  • Update Project

    Update an existing project

  • Delete Project

    Delete a project

Project Infos

  • Get Project Info

    Get details of a specific project

Organizations

  • Create Organization

    Create an organization owned by the token's user (on-prem only).

  • List Organizations

    List all organizations (self-hosted admin only).

  • Get Organization

    Read an organization by id (self-hosted admin only).

  • Update Organization

    Update an organization (self-hosted admin only).

  • Delete Organization

    Delete an organization (self-hosted admin only).

Self Hosted Organization Invitations

  • Create Self Hosted Organization Invitation

    Create a single-use organization invitation and return its join URL (self-hosted admin only).

Alerts

  • Create Alert

    Create a new alert.

  • List Alerts

    List all alerts for a project.

  • Get Alert

    Get an alert.

  • Update Alert

    Update an alert.

  • Delete Alert

    Delete an alert.

Channels

  • Create Channel

    Create a notification channel.

  • List Channels

    List all notification channels for the organization the project belongs to.

  • Get Channel

    Get a single notification channel by ID

  • Update Channel

    Update a notification channel.

  • Delete Channel

    Delete a notification channel.

Dashboards

  • Create Dashboard

    Create Dashboard

  • List Dashboards

    List Dashboards

  • Get Dashboard

    Get Dashboard

  • Update Dashboard

    Update Dashboard

  • Delete Dashboard

    Delete Dashboard

Variables Configs

  • Get Variables Config

    Get the full variables configuration for a project.

Variables

  • Create Variable

    Create a new variable definition, optionally with labels and versions.

  • Update Variable

    Update an existing variable definition, optionally with labels and versions.

Variable By Names

  • Get Variable By Name

    Get a variable definition by name with current labels and latest version.

Set Up Your Logfire MCP Server in Minutes

One endpoint. Any framework. Your agent is talking to Logfire in under 10 lines of code.

MCP Clients

Claude Desktop setup guide
Claude Code setup guide
Cursor setup guide
Goose setup guide

Agent Frameworks

Claude Desktop
{
  "mcpServers": {
    "stackone": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote@latest",
        "https://api.stackone.com/mcp?x-account-id=<account_id>",
        "--header",
        "Authorization: Basic <YOUR_BASE64_TOKEN>"
      ]
    }
  }
}

Platform Resources

MCP Code Mode: Keeping Tool Responses Out of Agent Context

Anthropic's code_execution processes data already in context. Custom MCP code mode keeps raw tool responses in a sandbox. 14K tokens vs 500.

11 min

Comparing BM25, TF-IDF, and Hybrid Search for MCP Tool Discovery

Benchmarking BM25, TF-IDF, and hybrid search for MCP tool discovery across 916 tools. The 80/20 TF-IDF/BM25 hybrid hits 21% Top-1 accuracy in under 1ms.

10 min

Indirect Prompt Injection Defense for MCP Tools: A Technical Guide

MCP tools that read emails, CRM records, and tickets are indirect prompt injection vectors. Here's how we built a two-tier defense that scans tool results in ~11ms.

12 min

MCP vs A2A: Architecture, Security, and When to Use Each

MCP vs A2A: what each protocol standardizes, how they differ, their shared security risks including indirect prompt injection, and when to use one, both, or a hybrid architecture.

12 min

MCP vs API: What 200+ Connector Builds Taught Us

MCP wraps APIs, it doesn't replace them. After building 200+ connectors that serve both, here's when each approach wins.

14 min read

Logfire MCP Server FAQ

Does StackOne have a Logfire MCP server?
Yes. StackOne offers a hosted Logfire MCP server with 30 pre-built actions, and every action is tested and QA'd by StackOne. Connect it to Claude, Cursor, and any other MCP client, or to any agent framework through the AI Action SDK. It ships with managed agent authentication, prompt injection defense, and tool discovery with server-side execution that preserve your agent's context window and keep reasoning performance.
Logfire MCP server vs direct API integration — what's the difference?
A Logfire MCP server and direct API integration serve different use cases. Direct API integration is for software-to-software — backend code calling Logfire. A Logfire MCP server is for AI agents — MCP clients like Claude and Cursor, plus framework agents built with OpenAI, LangChain, or Vercel AI — discovering and calling Logfire at runtime. StackOne provides both.
How does Logfire authentication work for AI agents?
Logfire authentication for AI agents works through a StackOne Connect Session. Create one via the dashboard or the SDK — you get an auth link and ready-to-paste config for Claude Desktop, Cursor, and other MCP clients. Your user authenticates their own Logfire account; StackOne handles token exchange, storage, and refresh. Credentials never reach the LLM, and each user is isolated via origin_owner_id.
Are Logfire MCP tools vulnerable to prompt injection?
Yes — Logfire MCP tools can be vulnerable to indirect prompt injection. Any tool that reads user-written content — documents, messages, tickets, records, or free-text fields — is a potential vector. StackOne Defender scans every tool response before it enters the agent's context — regex patterns in ~1ms, then a MiniLM classifier in ~4ms. 88.7% accuracy, CPU-only.
What is the context bloat of a Logfire agent and how do I avoid it?
Context bloat happens when Logfire tool schemas and API responses eat your Logfire agent's memory, preventing it from reasoning effectively. A single Logfire query can return a massive JSON response, and connecting multiple tools compounds the problem. Tools Discovery and Code Mode reduce context bloat — loading only relevant tools per query and keeping raw responses out of the agent's context.
Can I limit which actions my Logfire agent can access?
Yes — you can limit which actions your Logfire agent can access directly from the StackOne dashboard. Toggle actions on or off, or restrict them to specific accounts, with no code changes to your agent. Session tokens can be scoped to exact actions so if one leaks, exposure stays contained.
Can I create custom agent actions for my Logfire MCP server?
Yes — you can create custom agent actions for your Logfire MCP server using Connector Builder. It's an integration agent your coding assistant (Claude Code, Cursor, or Copilot) can invoke to research Logfire's API, generate production-ready connector YAML, test against the live API, and validate before you ship.
When should I NOT use a Logfire MCP server?
Skip a Logfire MCP server if your integration is purely software-to-software — direct Logfire API integration is simpler when no AI agent is involved. For deterministic, compliance-critical operations (financial transactions, regulatory reporting), direct API gives you predictable behavior without agent-driven decision-making. MCP shines when AI agents need to dynamically discover and call Logfire actions at runtime.
What AI frameworks and AI clients does the StackOne Logfire MCP server support?
The StackOne Logfire MCP server supports both. MCP clients (paste-and-go apps): Claude Desktop, Claude Code, Cursor, VS Code, Goose. Agent frameworks (code SDKs you build with): OpenAI Agents SDK, Anthropic, Vercel AI, Google ADK, CrewAI, Pydantic AI, LangChain, LangGraph, Azure AI Foundry.

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