# LaunchDarkly (slim)

> LaunchDarkly is a hosted feature flag and experimentation platform from Catamorphic, Co., with observability and AI configuration products. Agents reach it through an official hosted MCP server with OAuth and a REST API with a public OpenAPI spec.

- Full: https://www.anchorterminal.com/tools/launchdarkly.md (~8,300 tokens) · this version ~2,230 tokens · JSON https://www.anchorterminal.com/tools/launchdarkly.json · canonical https://www.anchorterminal.com/tools/launchdarkly
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

**B · 69.2/100 · rank #165 of 722 · #3 in Product analytics & experimentation · not agent-ready · confidence medium**


Assessment: LaunchDarkly suits agents that manage feature flags, rollouts and experiments. The hosted MCP server uses OAuth with dynamic client registration and marks its tools read-only or destructive, and the Developer plan is free without a card. The server lists 141 tools, numeric rate limits are unpublished, and the web application was unavailable for over an hour on 10 July 2026.

## Facts

- Kind: HTTP API · vendor: Catamorphic, Co. (dba LaunchDarkly) · category: Product analytics & experimentation · legal entity: Catamorphic, Co. (dba LaunchDarkly) · provenance 86/100
- Endpoint: `https://mcp.launchdarkly.com/mcp/launchdarkly` (HTTP, Streamable HTTP, stdio)
- Auth: OAuth or key · pricing: Freemium · x402: no · licence: Proprietary service under LaunchDarkly's terms. The local MCP server is MIT and the ldcli CLI is Apache-2.0
- Probe metrics: not measured yet (probes haven't run)
- Surface graded: The hosted service. The official hosted MCP server at mcp.launchdarkly.com and the REST API at app.launchdarkly.com. The local MCP server, with 20 tools, is for the EU and federal instances and was not graded
- MCP server: https://mcp.launchdarkly.com/mcp/launchdarkly over streamable HTTP with OAuth. 141 tools per the server page, 73 marked read-only, 35 destructive and 89 idempotent. Not available on the EU or federal instances
- API: OpenAPI 3.0.3 at https://app.launchdarkly.com/api/v2/openapi.json, readable without a login. 253 paths and 401 operations on 8 October 2026, 132 of them beta. Federal host app.launchdarkly.us, EU host app.eu.launchdarkly.com
- Experiments: REST endpoints to list, create and update experiments and start iterations, and MCP tools `create-experiment`, `start-experiment-iteration`, `stop-experiment-iteration`, `get-experiment-results` and `get-experiment-metric-results`
- Credentials: OAuth with PKCE (S256), dynamic client registration, revocation and scopes reader, writer and observability for MCP. Access tokens with a base role for the REST API, custom roles and inline policies on plans with custom roles, service tokens on Enterprise (200 an account by default)
- Rate limits: Global, route, access token and IP limits on ten-second windows. The numbers are not published. Responses carry `X-Ratelimit-Global-Remaining`, `X-Ratelimit-Route-Remaining`, `X-Ratelimit-Auth-Token-Remaining` and reset times, and IP limits carry `Retry-After`
- Versioning: `LD-API-Version` header or a version fixed per token. Current version 20240415. Version 20220603 reached end of life on 15 April 2025. Beta resources need `LD-API-Version: beta`
- Errors: JSON with `code`, `message` and `id`. The spec documents 403 on 355 operations, 404 on 321, 400 on 298 and 429 on 287
- Updates: JSON patch with a `test` operation on the resource version, JSON merge patch, and semantic patch with named instructions such as `turnFlagOn`. Updates take an optional comment that appears in the change history
- Free tier: Developer plan, no card. 1 project and 3 environments, unlimited seats and flags, 5 service connections, 1,000 client-side MAU, 100,000 experimentation MAU, 5,000 AI runs, 10 million logs and 10 million traces a month
- Paid: Foundation at $10 a service connection a month and $8.33 per 1,000 client-side MAU a month billed yearly, $5 per 1,000 extra AI runs, after a 14-day trial. Enterprise custom, with custom roles, approvals, workflows and SCIM
- SDKs and CLI: launchdarkly-server-sdk 9.18.1 for Python (6 October 2026), @launchdarkly/node-server-sdk 9.14.4, generated API clients launchdarkly-api 20.0.0 on npm and 24.0.0 on PyPI, ldcli v3.12.0 (24 September 2026), local MCP server 0.7.0 (5 October 2026)
- Audit: Change history with an API at /api/v2/auditlog. Limited to the last 30 days on the Developer plan, and to 30 days for account changes on Foundation
- SLA: 99.9 per cent monthly availability for Enterprise support customers and 99.99 per cent for Premium support, measured on the user interface of a production instance
- Certifications: SOC 2 Type II, ISO 27001 and FedRAMP authorisation listed on launchdarkly.com/security, with a trust centre on Vanta that we did not read
- Status: https://status.launchdarkly.com on Statuspage, 51 components. 13 incidents between 10 July and 8 October 2026, one marked critical
- Data: AWS in the USA, with Germany and France for the EU instance per the sub-processor list of 15 May 2026. AI services sub-processors are Anthropic, OpenAI and Speakeasy. 30 days' notice of new sub-processors under the DPA
- Prices: Foundation, service connection $10 per month (plan); Foundation, client-side MAU $0.0083 per end user per month; Additional AI run $0.005 per transaction

- Scores: Reliability 64, Performance pending, Schema & documentation 89, Agent ergonomics 69, Security & auth 66, Payments & pricing 40, Task success pending, Maintenance & community 82, Transparency & trust 80 · total over the 7 assessed categories
- Why: Reliability, Graded on the hosted service with the hosted lines. · Schema & documentation, OpenAPI 3.0.3 served without a login at app.launchdarkly.com/api/v2/openapi.json, with 253 paths and 401 operations (25). · Agent ergonomics, The hosted MCP server lists 141 tools, far past 30 (5). · Security & auth, The hosted MCP server uses OAuth with PKCE (S256), dynamic client registration, a revocation endpoint and three scopes, and an authorised ap… · Payments & pricing, No x402, MPP or L402 (0). · Maintenance & community, The Python server SDK 9.18.1 was published on 6 October 2026, the local MCP server v0.7.0 on 5 October and the docs changelog's newest entri… · Transparency & trust, Closed hosted service under published terms.
- Sources: 28, open questions: 9, both in the full twin
- Capabilities: analytics.flags, analytics.experiments, observability.logs, observability.errors
- JSON: https://www.anchorterminal.com/api/v1/tools/launchdarkly.json
- Verify (for the vendor): the badge `https://www.anchorterminal.com/badges/launchdarkly.svg` or a link to https://www.anchorterminal.com/tools/launchdarkly from a page on launchdarkly.com or one of its subdomains, or the README of github.com/launchdarkly/mcp-server, then `POST https://www.anchorterminal.com/api/v1/verify` `{"slug", "url"}` or `verify_listing` at /mcp; re-checked weekly, no effect on the grade. Snippets in the full twin.

## Before you call it

1. Connect to https://mcp.launchdarkly.com/mcp/launchdarkly over streamable HTTP with OAuth. On the EU or federal instance run the local `@launchdarkly/mcp-server` with `--server-url`
2. Authorise with a Reader role or the `reader` scope unless the task writes. A 403 after consent means the member's role lacks access
3. Send `LD-API-Version: 20240415` on every REST call, and `LD-API-Version: beta` for beta resources, which answer 403 without it
4. Read `X-Ratelimit-Global-Remaining`, `X-Ratelimit-Route-Remaining` and `X-Ratelimit-Reset` on each response, and wait `Retry-After` seconds on an IP limit
5. Send `Content-Type: application/json; domain-model=launchdarkly.semanticpatch` for semantic patches, or the body is read as JSON patch and answers 400

## Connect

```bash
npx -y --package @launchdarkly/mcp-server -- mcp start --api-key api-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
```

```bash
claude mcp add --transport http "launchdarkly" "https://mcp.launchdarkly.com/mcp/launchdarkly"
```
Full config and headless snippets are in the full page. Through letme (picks today, calling later): https://letme.dev/launchdarkly

## Similar tools

| Tool | Grade | Score | Shared capabilities | Slim |
| --- | --- | --- | --- | --- |
| PostHog | B | 68.4 | analytics.experiments, analytics.flags, observability.errors, observability.logs | https://www.anchorterminal.com/tools/posthog.min.md |
| Statsig | BB | 72.3 | analytics.experiments, analytics.flags | https://www.anchorterminal.com/tools/statsig.min.md |
| GrowthBook | BB | 70.1 | analytics.experiments, analytics.flags | https://www.anchorterminal.com/tools/growthbook.min.md |
| Amplitude | B | 66.2 | analytics.experiments, analytics.flags | https://www.anchorterminal.com/tools/amplitude.min.md |
| Optimizely Experimentation | B | 62.6 | analytics.experiments, analytics.flags | https://www.anchorterminal.com/tools/optimizely.min.md |


## Panel reviews (0, desk reviews from public material, no calls made)