Trace your agents from the editor you already use.
A drop-in MCP server that gives any MCP-compatible client — Claude Code, Cursor, Windsurf, Codex, Zed — six tools that stream Stackon Trace spans and run evals. One config block, a token, and every run your agent makes lands in Trace.
{
"mcpServers": {
"stackon": {
"command": "npx",
"args": ["@stackon/mcp"],
"env": { "STACKON_API_TOKEN": "ht_•••" }
}
}
}01
Up and running in one config block
Drop the Stackon MCP server into your editor's mcp.json, set your token, and restart. The six tools appear in the tool picker immediately — no SDK to adopt, no agent code to rewrite. The same block works across every MCP-compatible client.
{
"mcpServers": {
"stackon": {
"command": "npx",
"args": ["@stackon/mcp"],
"env": { "STACKON_API_TOKEN": "ht_•••" }
}
}
}02
Six tools, the full trace lifecycle
record_run captures a complete run in one shot — the simplest way to start. For multi-step work, start_trace, add_span, and end_trace build a nested waterfall (agent, llm, tool, eval, internal spans), and the server rolls up cost and tokens on close. list_recent_traces reads your team's traces; run_evals grades any trace against your enabled evals.
03
Same span schema, same team identity
Whether a run starts in Claude Code, on the canvas, or via the API, it's the OTel-compatible span schema flowing into the same Trace backend under the same team. Observability follows your agents across every surface — one timeline, not five disconnected ones.
{
"mcpServers": {
"stackon": {
"command": "npx",
"args": ["@stackon/mcp"],
"env": { "STACKON_API_TOKEN": "ht_•••" }
}
}
}04
Scoped tokens, hashed at rest
Each token is scoped to a single team and can read or write traces only within it. Tokens are SHA-256 hashed at rest — the plaintext is shown exactly once on creation — and the server never persists it, reading from the env var and passing it as a bearer header. Revoked tokens are rejected on every call.
in email dana@acme.io, card 4242 4242 4242 4242
out email <REDACTED:email>, card <REDACTED:credit_card>
6
MCP tools
5+
Editors
OTel-compatible
Schema
Part of one platform
Stackon MCP works hand in hand with Apps & Surfaces.
Speed plus trust — prove your agents got better this week.
Stackon MCP is one piece of Stackon, the observability-first workspace for teams running Claude and Codex. Start free and instrument your first run today.