What is the key difference between Agent47 and Spanlens?

Agent47 belongs to the Monitoring category with local stdio execution, while Spanlens belongs to the Monitoring category with local stdio execution.

How do I install Agent47 or Spanlens in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are Agent47 and Spanlens free or paid?

Agent47 operates under a Free / Open Source model (No auth required). Spanlens operates under a Free / Open Source model (API Key required).

Which MCP server has more tools and community activity?

Agent47 lists 6 tools with 2 views and 4 GitHub stars. Spanlens lists 6 tools with 3 views and 13 GitHub stars.

Can I use both Agent47 and Spanlens together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

Side-by-Side Model Context Protocol Comparison

Agent47 vs Spanlens

In-depth architectural comparison of the Agent47 and Spanlens MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

At a Glance & Executive Verdict

Agent47

Monitoring · Local stdio

Quality: 49/100 (Fair) | Auth: No auth required

Spanlens

Monitoring · Local stdio

Quality: 56/100 (Good) | Auth: API Key required

Verdict Summary: Choose Agent47 if you need specialized Monitoring tools running via a local process. Choose Spanlens if your workspace requires Monitoring integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Agent47 when:

You need dedicated capabilities in the Monitoring domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).
Primary tools included: Budget, loop, fuzzy-loop, retry, timeout, and rate-limit guards, Task-level budgets with warning hooks, OpenAI and Anthropic provider patches.

Explore Agent47 Details

Choose Spanlens when:

You need dedicated capabilities in the Monitoring domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: API Key required (Free / Open Source).
You have access to required keys: SPANLENS_API_KEY.
Primary tools included: Seven read-only observability tools, Request log queries, Agent trace inspection.

Feature & Specification Comparison

Specification	Agent47 bmdhodl Monitoring	Spanlens spanlens Monitoring
Summary	Runtime guardrails and incident read access for coding agents. Query AgentGuard traces, alerts, usage, costs, and budget health.	Query your Spanlens LLM observability from any MCP client. 7 read tools for request logs, agent traces, cost stats, anomalies, model-savings, and per-user analytics across OpenAI, Anthropic, and Gemini. Open source, self-hostable. npx -y @spanlens/mcp-server
Category & Scope

Tools & Capabilities Breakdown

Agent47 Tools (6)

Budget, loop, fuzzy-loop, retry, timeout, and rate-limit guards

Task-level budgets with warning hooks

OpenAI and Anthropic provider patches

Local JSONL traces with no network by default

Optional LangChain, LangGraph, and CrewAI hooks

x402 spend guard for cumulative, endpoint, and per-call limits

Spanlens Tools (6)

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

Agent47 Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "bmdhodl-agent47": {
      "command": "npx",
      "args": [
        "-y",
        "@agentguard47/mcp-server"
      ]
    }
  }
}

Spanlens Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "spanlens-spanlens-2": {
      "command": "npx",
      "args": [
        "-y",
        "@spanlens/cli"
      ],
      "env": {
        "SPANLENS_API_KEY": "YOUR_SPANLENS_API_KEY_HERE"
      }
    }
  }
}

Frequently Asked Questions

Agent47 is categorized under Monitoring and uses a local stdio subprocess. In contrast, Spanlens belongs to Monitoring using local stdio subprocess. Select Agent47 when you need capabilities focused on monitoring and Spanlens when you require tools for monitoring.

More alternatives to Agent47 More alternatives to Spanlens Monitoring category hub