# bugsnag_list_trace_fields

Get available trace fields/attributes for filtering Parameters: - projectId (string): Unique identifier of the project. This is optional if a current project is set and is used to set the current project for BugSnag tools. Use Cases: 1. Find available custom attributes for performance filtering 2. Understand what metadata is attached to traces 3. Build dynamic filters based on available fields Examples: 1. Get all trace fields json {} Expected Output: Array of field names and types available for filtering Hints: 1. Trace fields are custom attributes added to spans 2. Use these fields for filtering other performance queries

Agent View of the PolicyLayer registry record for `bugsnag_list_trace_fields`. HTML page: https://policylayer.com/tools/smartbear-mcp/bugsnag-list-trace-fields

## Facts

- Tool: `bugsnag_list_trace_fields`
- Server: SmartBear MCP (`SmartBear/smartbear-mcp`) — https://policylayer.com/tools/smartbear-mcp.md
- Homepage: https://github.com/SmartBear/smartbear-mcp
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 1
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `projectId` | string | no | Unique identifier of the project. This is optional if a current project is set and is used to set the current project for BugSnag tools. |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "bugsnag_list_trace_fields",
    "arguments": {}
  }
}
```

## Why bugsnag_list_trace_fields is rated Low

This tool queries and returns metadata about available trace fields without side effects. It retrieves schema/attribute information to enable filtering elsewhere, which is a pure read operation with minimal blast radius if misused by an agent.

From the tool's own definition: "Tool name includes 'list', description states 'Get available trace fields/attributes for filtering'. The use cases confirm retrieval only: 'Find available custom attributes', 'Understand what metadata is attached', 'Build dynamic filters'."

## Use case

AI agents call bugsnag_list_trace_fields to retrieve information from SmartBear MCP without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches SmartBear MCP:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "bugsnag_list_trace_fields": {}
  }
}
```

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## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=smartbear-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/smartbear-mcp