LLaunchDarkly MCP (official)

Tested npm @launchdarkly/mcp-server 0.7.2 (MIT; repo launchdarkly/mcp-server). `mcp start` over stdio listed 30 tools for feature flags, AI configs, metrics and experiments without a key. Both read calls (list-feature-flags, get-environments) answered 'Invalid account ID header': every tool needs a LaunchDarkly API access token. Core tools not tested. Create, update and delete tools were not called.
Tool-call test (2026-11-11, direct MCP stdio client, no LLM): fail. 0 of 2 calls passed; every tool needs a LaunchDarkly API key. Core tools not tested. Evidence: local test run, Nov 11, 2026.

Transport (tested 2026-11-11): stdio

Score 70/100 · Tools 30 · Token cost approx. 6,634 tokens · Compare · Last tested 2026-11-11 · Version tested 0.7.2 · Package @launchdarkly/mcp-server · Repo launchdarkly/mcp-server

Summary: LaunchDarkly MCP (official) completed an MCP handshake without credentials and exposed 30 tools.

Evidence summary

Handshake

pass

Tools listed

30

Context cost

approx. 6634 tokens, cl100k estimate (30 tools, measured 2026-11-11, version 0.7.2; an estimate) ranking · add up your servers' context cost

API key

Connects without a key; tool calls need one

Tested

2026-11-11

Test results

Local-model readiness

Token cost (estimate): approx. 6634 tokens, cl100k estimate for 30 tools · about 81% of an 8k context. This is an estimate from our testing (counted with cl100k_base).

Small-model friendly (schema heuristic, not a model result): unknown.

What we tested and what we didn't

Methodology: how we test. A high score means it installs and responds, not that giving it access to your data carries no risk.

{
  "name": "@launchdarkly/mcp-server",
  "version": "0.7.2",
  "registry": "npm",
  "status": "working",
  "tested": "2026-11-11",
  "tools_count": 30,
  "deprecated": false,
  "archived": false,
  "tests": {
    "install": [
      "pass",
      20,
      "`npm install @launchdarkly/mcp-server` (Node 20, Linux) succeeded in 1s."
    ],
    "handshake": [
      "pass",
      30,
      "MCP `initialize` + `tools/list` over stdio succeeded with no credentials; 30 tools listed in 6.3s."
    ],
    "maintenance": [
      "pass",
      25,
      "Repo pushed 0 days before test; 27 GitHub stars."
    ],
    "docs": [
      "pass",
      15,
      "README over 3,000 chars; install instructions present; `mcpServers` config example present. Check of the package's own README (README shipped in npm package)."
    ],
    "license": [
      "pass",
      10,
      "MIT (OSI-approved)."
    ]
  }
}

Install

npx -y @launchdarkly/mcp-server startCopy

Pin the version we tested

npx -y @launchdarkly/mcp-server@0.7.2 startCopy

tested 2026-11-11. Newer versions may differ and were not tested by us.

{
  "mcpServers": {
    "launchdarkly-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@launchdarkly/mcp-server@0.7.2",
        "start"
      ]
    }
  }
}

Tools listed

create-ai-config, create-ai-config-variation, create-experiment, create-experiment-iteration, create-feature-flag, create-metric, delete-ai-config, delete-ai-config-variation, delete-feature-flag, get-ai-config, get-ai-config-targeting, get-ai-config-variation, get-audit-log-entries, get-code-references, get-environments, get-experiment, get-feature-flag, get-flag-status-across-environments, get-metric, list-ai-configs, list-experiments, list-experiments-any-environment, list-feature-flags, list-metrics, update-ai-config, update-ai-config-targeting, update-ai-config-variation, update-experiment, update-feature-flag, update-metric

Tool history: captured Nov 11, 2026. All tool history.

Quick config

{
  "mcpServers": {
    "launchdarkly-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@launchdarkly/mcp-server",
        "start"
      ]
    }
  }
}

Add to config Opens the config generator with this server selected.

{
  "mcpServers": {
    "launchdarkly-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@launchdarkly/mcp-server",
        "start"
      ]
    }
  }
}

FAQ

Is LaunchDarkly MCP deprecated?

No. @launchdarkly/mcp-server was not deprecated or archived when we last tested it on 2026-11-11.

What replaces LaunchDarkly MCP?

Nothing; LaunchDarkly MCP (official) is not deprecated as of 2026-11-11.

Does LaunchDarkly MCP need an API key?

It connects and lists 30 tools without a key, but its tool calls need one.

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