nLight.fit documentation
Full-fidelity reference for the nLight.fit platform: how the tracking ledger, AI coach, voice agent and health integrations work, and how to reach your own data over the Model Context Protocol. The docs assistant in the bottom-right corner will find and curate the right pages for a question — it only talks about these docs.
nLight.fit API documentation. Start at nLight.fit developer resources. The machine description is the nLight.fit OpenAPI specification. The whole handshake runs without a credential on POST /api/mcp - initialize, server/discover, ping and tools/list - and POST /api/sandbox needs none for anything at all. Rate limits arrive as RateLimit / RateLimit-Policy with Retry-After on a 429. Deprecation is signalled with Deprecation and Sunset headers; the policy is at nLight.fit API versioning and deprecation. Install the official CLI with npm install -g https://nlight.fit/cli/nlight-fit-latest.tgz.
Every page is also raw Markdown at /docs/<slug>.md. Machine index: /llms.txt. Full corpus: /llms-full.txt.
curl -s https://nlight.fit/openapi.json | head
curl -s -X POST https://nlight.fit/api/sandbox \
-H 'content-type: application/json' \
-d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'
npm install -g https://nlight.fit/cli/nlight-fit-latest.tgz \&\& nlight toolsStart
- OverviewWhat nLight.fit is - a daily commitment ledger with an AI coach that has full-resolution memory of your history, plus WHOOP, bloodwork and genetics.
- MembershipWhy the nLight.fit Member plan is $50/year - higher reasoning over your full history, with concrete examples of what that actually changes.
- QuickstartFrom a new nLight.fit account to a coached conversation grounded in your own data, in about ten minutes.
- ConceptsThe vocabulary nLight.fit uses - ledger, metric registry, learnings, Mission Statement, correlation tiers, feature store and more.
Platform
- The ledgerHow daily tracking works in nLight.fit - columns, custom metrics, check-in frequency, immediate persistence and CSV import/export.
- Metric referenceEvery metric nLight.fit tracks: 59 canonical fields with types, units and analytical roles.
- AI coachHow the nLight.fit coach decides what to read, how hard to think, and how it grounds answers in your actual record.
- Docs assistantThe public, docs-only overlay that finds, curates and links to nLight.fit documentation. It will not talk about anything else.
- Voice agentReal-time spoken conversation with the nLight.fit coach, with modes for open chat, hands-free data entry and guided onboarding.
- Mission StatementOne goal, three commitments - a structured declaration of intent that nLight.fit measures progress and causality against.
- AnalyticsWhat nLight.fit computes in the background - correlations with statistical controls, personal records, readiness, goal ETA, changepoints and narrative summaries.
- Progress picturesPhoto tracking in nLight.fit, stored against your record alongside the numbers.
Integrations
- WHOOPConnect WHOOP to nLight.fit - OAuth, sync schedule, webhooks, and which recovery, sleep and strain metrics become columns.
- BloodworkUpload lab report PDFs to nLight.fit - biomarkers are extracted into a structured record with trends, reference ranges and behaviour correlations.
- Methylation geneticsUpload a methylation genetic test to nLight.fit - a one-time profile that explains mechanisms and predicts which biomarkers to watch.
Developers & Agents
- nLight.fit developer resourcesThe nLight.fit developer reference - the MCP server and its manifest, the credential-free sandbox, the OpenAPI specification, authentication, every endpoint with example requests, and the response conventions each one follows.
- nLight.fit MCP servernLight.fit exposes your health record to external AI clients over the Model Context Protocol, as a stateless HTTP JSON-RPC endpoint with read-only tools.
- nLight.fit sandboxA credential-free nLight.fit MCP server answering the same eighteen tools from a synthetic member record, so an agent can evaluate the integration before anyone has an account.
- nLight.fit MCP tool referenceEvery tool exposed by the nLight.fit MCP server: 18 read-only tools with full input schemas.
- nLight.fit authenticationHow nLight.fit API tokens work - format, scopes, storage, revocation, and why they are not session tokens.
- nLight.fit client setupConnect Claude Code, Claude Desktop, Cursor or a custom client to the nLight.fit MCP server.
- nLight.fit CLIThe official nLight.fit command-line tool. List MCP tools, complete a protocol handshake, and fetch the OpenAPI specification without writing an integration. Defaults to the credential-free sandbox.
- nLight.fit token managementMinting, listing and revoking nLight.fit API tokens from Settings, and how to treat a token once you have one.
- nLight.fit API versioning and deprecationHow the nLight.fit API is versioned, how a breaking change is announced before it lands, and the Deprecation and Sunset headers a client can rely on.
- nLight.fit errors and limitsStatus codes, JSON-RPC error codes, rate limits and protocol versions for the nLight.fit MCP endpoint.
Trust
- Security and privacyHow nLight.fit protects your data - encryption, authentication, AI safety, third-party handling, and an honest account of what is not protected.
- Data modelWhat nLight.fit stores - collections, the shape of a tracked day, derived artifacts, and how the pieces relate.
- ChangelogUser-visible changes to the nLight.fit platform, newest first.