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Connect ChatGPT to Hark via MCP — setup guide

Add Hark to ChatGPT as a custom connector so it reads the same project brief as your other tools and proposes updates you can approve.

MCP endpoint
https://harkstudio.io/mcp

Sign in to Hark to connect a client. Personal tokens and per-account details live inside the app.

ChatGPT

Needs a paid plan and Developer mode turned on.

Requirements: a paid plan (Plus, Pro, Business, Enterprise, or Edu) — custom connectors are not available on Free. Workspace admins may need to enable Developer mode.

  1. Settings → Apps (labelled Connectors in some versions) → Advanced settings → turn on Developer mode.
  2. In the same section click Create (or Add custom connector). Name: Hark. MCP server URL: https://harkstudio.io/mcp. Authentication: OAuth. Save.
  3. ChatGPT opens the Hark sign-in — approve.
  4. Start a new chat → open the + menu → More → Developer mode (or the tools menu) → enable Hark for that chat. Tool calls ask for confirmation before writes.
MCP server URL
https://harkstudio.io/mcp

OpenAI has moved the Developer mode toggle between settings sections over time; if it isn't under Apps/Connectors, check Settings → Security.

Verify it works

Ask your client: "List my Hark workspaces." Expected: your workspace names.

Then: "Create a project called Connection test in <workspace>." Expected: a new V-### appears in the app and the activity log shows the source ("via Claude Code", "via Codex", etc.). Delete the test venture afterward.

Troubleshooting

  • "Unauthorized request origin" — the client origin isn't allowlisted; retry from the latest app version, or email hello@harkstudio.io.
  • Consent screen loops / stale token — remove the connector in the client, sign out of Hark, sign back in, re-add the connector.
  • Tools list is empty — the connector isn't enabled for this chat (Claude and ChatGPT require enabling it per conversation).
  • Plan cap error — you've hit the monthly agent-call cap for this workspace; see billing.
  • Old endpoint — anything pointing at a lovable.app URL must be updated to harkstudio.io/mcp.

What Hark keeps clear

Evidence on every line

Every record shows Agreed / Observed / Proposed and a source you can open: where did this come from? Agreed means accepted, not independently verified. Observed is reserved for system evidence such as a merged pull request. An agent's claim is never shown as verified simply because it was accepted.

Learn more about Evidence on every line

Repo-native rules

Once linked and selected as the source, the repo's CLAUDE.md or AGENTS.md is authoritative. Hark mirrors it on pushes and retains history rather than authoring competing edits. Optional .hark/ export carries accepted handoff state and decisions into the repo. Repo activity suggests drafts with commit evidence. Agent briefs include mirrored instruction documents and linked repo metadata. Arbitrary repo-document browsing is not exposed by the current tools: Hark never serves source code. Automatic session hooks and compaction protection in the Hark mod are Claude Code-only; other tools follow their connection guide and explicit session tools.

Learn more about Repo-native rules

Scoped, expiring agent access

New agent keys default Propose: suggest changes, never approve them. An eight-character pairing code expires after 15 minutes and works once; no key is pasted into a setup chat. One-link agent approval asks you to sign in, choose permissions, projects and expiry, then approve. The agent still completes pairing. Keys normally expire after 90 days and can be revoked or rotated. The separate show-once Copy key path is for private storage, not chat.

Learn more about Scoped, expiring agent access
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