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Trace Forge

mdfifty50-boop/trace-forge-mcp

Gives Claude write access to create structured execution traces with spans, tool calls, and decision logging. You get six tools: trace_start to begin tracking an agent task, trace_span for nested work units, trace_tool_call to log each tool invocation with duration and cost estimation, trace_decision to record reasoning and alternatives considered, trace_end to finalize with automatic metrics, and get_trace plus search_traces for retrieval. Stores everything locally via stdio transport. Built specifically for EU AI Act Article 14 compliance, which mandates traceability for high-risk AI systems starting August 2026. The only observability MCP that writes data instead of just reading it.

tools: 7
transport: STDIO
last updated: Apr 24, 2026

Tools

7 tools

Public tool metadata for what this MCP can expose to an agent.

trace_startBegin a new trace for an agent task.

Begin a new trace for an agent task.

No parameter schema in public metadata yet.

trace_spanCreate a span within a trace. Spans can be nested via `parent_span_id`.

Create a span within a trace. Spans can be nested via `parent_span_id`.

No parameter schema in public metadata yet.

trace_tool_callLog a tool call within a trace. Auto-calculates cost estimate from token count.

Log a tool call within a trace. Auto-calculates cost estimate from token count.

No parameter schema in public metadata yet.

trace_decisionLog an agent decision point with reasoning and alternatives considered.

Log an agent decision point with reasoning and alternatives considered.

No parameter schema in public metadata yet.

trace_endComplete a trace. Auto-calculates total duration, event counts, and span counts.

Complete a trace. Auto-calculates total duration, event counts, and span counts.

No parameter schema in public metadata yet.

get_traceRetrieve a complete trace tree with all spans, events, tool calls, and decisions.

Retrieve a complete trace tree with all spans, events, tool calls, and decisions.

No parameter schema in public metadata yet.

search_tracesFind traces by agent ID and/or status.

Find traces by agent ID and/or status.

No parameter schema in public metadata yet.

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Readme

trace-forge-mcp

MCP server for writing structured traces, spans, and decisions. The only write-path observability MCP — all 9 existing observability MCPs are read-only.

Built for EU AI Act traceability compliance (Article 14, due August 2026).

Install

npx trace-forge-mcp

Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "trace-forge": {
      "command": "npx",
      "args": ["trace-forge-mcp"]
    }
  }
}

From source

git clone https://github.com/mdfifty50-boop/trace-forge-mcp.git
cd trace-forge-mcp
npm install
node src/index.js

Tools

trace_start

Begin a new trace for an agent task.

Param	Type	Required	Description
`agent_id`	string	yes	Unique agent identifier
`task_description`	string	yes	What the agent is doing
`metadata`	object	no	Optional metadata (model, department, priority)

Returns: { trace_id, started_at }

trace_span

Create a span within a trace. Spans can be nested via parent_span_id.

View the full README on GitHub

Details

Repository: github.com/mdfifty50-boop/trace-forge-mcp
Category: Monitoring & Observability
Package: trace-forge-mcp
Transport: STDIO
Registry: MCP registry, active

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