Structured execution trace and span logging for AI agents
Structured execution trace and span logging for AI agents
MCP server for writing structured traces, spans, and decisions. The only write-path observability MCP — all 9 existing observability MCPs are read-only.
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Check the linked publisher documentation and your connected client's tool list. Names and availability can vary with the server version and account permissions.
| Tool | What it does |
|---|---|
| trace_tool_call | after each tool invocation |
| trace_decision | at each decision point |
| trace_start | |
| trace_span | Create a span within a trace. Spans can be nested via parent_span_id. |
| trace_end | Complete a trace. Auto-calculates total duration, event counts, and span counts. |
| get_trace | Retrieve a complete trace tree with all spans, events, tool calls, and decisions. |
| search_traces | Returns: Matching traces sorted by recency with summary stats. |
{
"mcpServers": {
"trace-forge": {
"command": "npx",
"args": ["-y", "trace-forge-mcp"]
}
}
}Add to claude_desktop_config.json, then restart Claude Desktop.
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