Arize Phoenix MCP
LLM observability platform exposing prompts, projects, traces, spans, sessions, datasets, and experiments through MCP. Published to npm as @arizeai/phoenix-mcp, current 4.0.8 (2026-04-29). 9,496 stars on parent monorepo, Elastic License 2.0.
“LLM observability platform exposing prompts, projects, traces, spans, sessions, datasets, and experiments through MCP. 100 commits on main in the last 30 days. Published to npm as @arizeai/phoenix-mcp, current 4.0.8. Elastic License 2.0: free to use, host, and modify; downstream commercial competing products are restricted.”
INSTALL THIS SERVER
{
"mcpServers": {
"phoenix": {
"command": "npx",
"args": [
"-y",
"@arizeai/phoenix-mcp@latest",
"--baseUrl",
"https://my-phoenix.com",
"--apiKey",
"<your-api-key>"
]
}
}
}
{
"mcpServers": {
"phoenix": {
"command": "npx",
"args": [
"-y",
"@arizeai/phoenix-mcp@latest",
"--baseUrl",
"https://my-phoenix.com",
"--apiKey",
"<your-api-key>"
]
}
}
}
{
"mcpServers": {
"phoenix": {
"command": "npx",
"args": [
"-y",
"@arizeai/phoenix-mcp@latest",
"--baseUrl",
"https://my-phoenix.com",
"--apiKey",
"<your-api-key>"
]
}
}
}
{
"mcpServers": {
"phoenix": {
"command": "npx",
"args": [
"-y",
"@arizeai/phoenix-mcp@latest",
"--baseUrl",
"https://my-phoenix.com",
"--apiKey",
"<your-api-key>"
]
}
}
}
{
"mcpServers": {
"phoenix": {
"command": "npx",
"args": [
"-y",
"@arizeai/phoenix-mcp@latest",
"--baseUrl",
"https://my-phoenix.com",
"--apiKey",
"<your-api-key>"
]
}
}
}
8 TOOLS AVAILABLE
OUR ASSESSMENT
- 100 commits on main in the last 30 days on the parent monorepo.
- 9,496 GitHub stars.
- Published to npm as @arizeai/phoenix-mcp with semantic versioning (current 4.0.8, released 2026-04-29).
- Tool surface covers prompts, projects, traces, spans, sessions, annotation configs, datasets, and experiments.
- Phoenix is widely adopted in the LLM observability space; this MCP plugs directly into existing Phoenix deployments.
- One-click Cursor install link in the README.
- Elastic License 2.0 is source-available, distinct from a permissive open-source licence; review ELv2 terms for downstream commercial use.
- Phoenix documentation search ships as a separate MCP server; the operator picks one or both.
- Requires a running Phoenix instance (self-hosted or Cloud) to be useful.
- API key handling: the MCP needs a Phoenix API key, which carries the same access as the dashboard user it represents.
The MCP carries Phoenix API key permissions through to the agent. Scope the API key to read-only when the agent does diagnostic work; reserve write-capable keys for workflows where prompt or dataset mutation is desired. Self-hosted Phoenix instances inside private networks reduce attack surface compared with Phoenix Cloud, at the cost of operational overhead. The Elastic License 2.0 permits production use; it restricts offering Phoenix as a competing managed service to third parties.
Teams running Phoenix as their LLM trace and evaluation surface who want agents to query traces, manage prompts, and inspect experiments through MCP; prompt-management workflows where the agent versions, tags, and retrieves prompts directly from Phoenix; dataset and experiment management inside Cursor, Claude Code, or VS Code.
TECHNICAL DETAILS
ADOPTION METRICS
// Reading this9,496 stars on the parent Arize-ai/phoenix monorepo. 100 commits on main in the last 30 days.
// Reading thisSecond-ranked in ai-ml on observability scope and adoption.
SOURCES & VERIFICATION
We don't take any single directory's word for it. Before scoring, we cross-reference 5 public MCP sources, install the server ourselves against the clients we cover, and record when we last re-verified.
The same server, 5 different lenses. We reconcile these signals into our editorial score, which is why our number sometimes diverges from a directory-aggregate star count.
| Source | Their rating | Their star count | Their downloads | Last synced |
|---|---|---|---|---|
| AutomationSwitch This page | 4.5editorial | 9,496 | — | MAY 1, 2026 |
| PulseMCP | — unrated | unavailable | unavailable | MAY 1, 2026 |
| MCP.so | — unrated | unavailable | unavailable | MAY 1, 2026 |
| Glama | — unrated | unavailable | unavailable | MAY 1, 2026 |
| Smithery | — unrated | unavailable | unavailable | MAY 1, 2026 |
| Official MCP Registry | — unrated | unavailable | unavailable | MAY 1, 2026 |
// Counts are directory-reported; we don't adjust them. Discrepancies usually come from different snapshot times or star-caching.
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