ProvelyLangGraph connects to Provely through the MCP server, the CLI, the SDK, the REST API. The agent does the action. Provely verifies the outcome and signs a receipt. LangGraph never holds the verifier credentials.
A person verified the LangGraph capabilities on 2026-09-05. Agent products change monthly. Re-verify before you build.
Source: integration profile langgraph · retrieved 2026-09-05
Which surfaces does LangGraph use?
| Surface | Support | Detail |
|---|---|---|
| MCP server | Supported | transport stdio, http |
| CLI | Supported | Runs through the shell tool of the agent. |
| SDK | Supported | languages python, typescript; adapter langgraph |
| REST API | Supported | Any HTTP call reaches the control plane. |
Which guidance files does LangGraph read?
The renderer writes prompt fragment from one source. A new agent needs a profile, not core code.
| Format | Path | Mode |
|---|---|---|
| prompt fragment | provely/prompt-fragment.md | fragment |
| CI gate workflow | .provely/ci/github-actions.yml | fragment |
How is a false completion claim blocked?
| Enforcement | Support | Detail |
|---|---|---|
| Advisory guidance | Supported | The instruction files state the rules for every agent. |
| Lifecycle hooks | Not supported | No hook events stated. |
| CI gate | Supported | provely verify --wait fails the pipeline unless the verdict is VERIFIED. |
How do I connect LangGraph?
Connect LangGraph to Provely
- Install the CLI.Run
npx provely --version, or download the static binary. - Register the MCP server.Add the Provely server. Use
provely mcpfor stdio, or the hosted HTTP server with a bearer token. The tools arebegin,verify,status, andreceipt. - Write the guidance files.Run
provely init --agent langgraph. It writesprovely/prompt-fragment.md(fragment),.provely/ci/github-actions.yml(fragment). The guidance carries one rule: a successful tool call is not completion. - Add the CI gate.Run
provely verify --wait <duration>in the pipeline. The step fails unless the verdict is VERIFIED. Exit codes: 0 VERIFIED, 2 PENDING, 3 FAILED, 4 CONTRADICTED, 5 UNVERIFIABLE. - Report the verdict exactly as returned.VERIFIED: "The action is verified complete. Receipt: <id>." PENDING: "The action is accepted but not yet verified. Operation: <id>."
What else does the profile state?
- Verified 2026-09-05: LangGraph ships in Python and in JavaScript. Tools attach through ToolNode and @tool. Source: https://github.com/langchain-ai/langgraph (README.md, libs/langgraph/pyproject.toml).
- Use the langgraph adapter. Wrap a node so the action runs inside an operation. Attach the verdict to the step result. A node that ends while PENDING stores the operation id in the graph state.
- MCP: LangGraph agents consume MCP servers through the langchain MCP adapters. Point them at
provely mcp.
LangGraph keeps its action credentials, and no surface returns the verifier credentials to it. Read the credential boundary. An operation outlives the session that opened it. Read the API reference.
Which host versions does the profile cover?
>=1.0.0. The integrations team last verified the profile with langgraph 1.2.11 (PyPI) and @langchain/langgraph 1.4.14 (npm) on 2026-09-05.