Back to Browse
Free
Server data from the Official MCP Registry
Structured execution trace and span logging for AI agents
About
Structured execution trace and span logging for AI agents
Security Report
4.2
Use Caution4.2High Risktrace-forge-mcp is a write-path observability MCP server for EU AI Act compliance with a clean, focused purpose. The codebase uses standard MCP patterns with proper dependency management (zod for validation, better-sqlite3 for persistence). No authentication mechanism is implemented, which is appropriate for a local tracing server that relies on the parent process's security model. Minor code quality concerns and lack of explicit input validation documentation prevent a higher score, but permissions align well with the stated purpose. Supply chain analysis found 4 known vulnerabilities in dependencies (0 critical, 3 high severity). Package verification found 1 issue.
4 files analyzed · 9 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-mdfifty50-boop-trace-forge": {
"args": [
"-y",
"trace-forge-mcp"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub 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.
| Param | Type | Required | Description |
|---|---|---|---|
trace_id | string | yes | Trace to attach to |
span_name | string | yes | Span name (e.g. "research", "validation") |
parent_span_id | string | no | Parent span for nesting |
metadata | object | no | Optional span metadata |
Returns: { span_id, trace_id }
trace_tool_call
Log a tool call within a trace. Auto-calculates cost estimate from token count.
| Param | Type | Required | Description |
|---|---|---|---|
trace_id | string | yes | Trace this belongs to |
span_id | string | no | Span this belongs to |
tool_name | string | yes | Tool that was called |
args | object | yes | Arguments passed |
result_preview | string | yes | Result preview (max 500 chars) |
tokens_used | number | no | Token count (enables cost estimation) |
duration_ms | number | yes | Call duration in milliseconds |
status | string | yes | "success", "error", or "timeout" |
Returns: { event_id, logged: true }
trace_decision
Log an agent decision point with reasoning and alternatives considered.
| Param | Type | Required | Description |
|---|---|---|---|
trace_id | string | yes | Trace this belongs to |
reasoning | string | yes | Why the agent made this decision |
alternatives_considered | string[] | yes | Other options evaluated |
chosen_action | string | yes | What was decided |
confidence | number | yes | Confidence 0.0 to 1.0 |
Returns: { event_id, logged: true }
trace_end
Complete a trace. Auto-calculates total duration, event counts, and span counts.
| Param | Type | Required | Description |
|---|---|---|---|
trace_id | string | yes | Trace to complete |
outcome | string | yes | "success", "failure", "partial", or "timeout" |
summary | string | no | Optional summary |
Returns: { trace_id, duration_ms, events_count, spans_count, tool_calls_count }
get_trace
Retrieve a complete trace tree with all spans, events, tool calls, and decisions.
| Param | Type | Required | Description |
|---|---|---|---|
trace_id | string | yes | Trace ID to retrieve |
Returns: Full trace object with nested span tree, all events, and computed totals.
search_traces
Find traces by agent ID and/or status.
| Param | Type | Default | Description |
|---|---|---|---|
agent_id | string | - | Filter by agent |
status | string | - | Filter by status |
limit | number | 20 | Max results (1-100) |
Returns: Matching traces sorted by recency with summary stats.
Resources
| URI | Description |
|---|---|
traces://recent | Last 20 traces with summary |
traces://stats | Aggregate statistics (total, avg duration, success rate) |
Usage Pattern
1. trace_start — when agent begins a task
2. trace_span — create logical work units (research, generation, validation)
3. During execution:
- trace_tool_call — after each tool invocation
- trace_decision — at each decision point
4. trace_end — when task completes
5. get_trace — retrieve full audit trail
6. search_traces — find traces by agent or status
EU AI Act Compliance
Article 14 of the EU AI Act requires high-risk AI systems to maintain traceability of decisions and actions. trace-forge-mcp provides:
- Structured decision logging with reasoning and alternatives
- Complete tool call audit trails with timing and cost
- Hierarchical span trees for complex multi-step tasks
- Agent identification and task attribution
License
MIT
Reviews
No reviews yet
Be the first to review this server!
More Developer Tools MCP Servers
Git
Freeby Modelcontextprotocol · Developer Tools
Read, search, and manipulate Git repositories programmatically
80.0K
Stars
4
Installs
6.5
Security
No ratings yet
Local
Toleno
Freeby Toleno · Developer Tools
Toleno Network MCP Server — Manage your Toleno mining account with Claude AI using natural language.
114
Stars
409
Installs
8.0
Security
4.8
Local
mcp-creator-python
Freeby mcp-marketplace · Developer Tools
Create, build, and publish Python MCP servers to PyPI — conversationally.
-
Stars
55
Installs
10.0
Security
5.0
Local
MarkItDown
Freeby Microsoft · Content & Media
Convert files (PDF, Word, Excel, images, audio) to Markdown for LLM consumption
116.1K
Stars
15
Installs
6.0
Security
5.0
Local
mcp-creator-typescript
Freeby mcp-marketplace · Developer Tools
Scaffold, build, and publish TypeScript MCP servers to npm — conversationally
-
Stars
14
Installs
10.0
Security
5.0
Local
FinAgent
Freeby mcp-marketplace · Finance
Free stock data and market news for any MCP-compatible AI assistant.
-
Stars
13
Installs
10.0
Security
No ratings yet
Local