How do I install the Langgraph Foundation skill?

Run npx skillmds@latest add ryan-brosas/langgraph-foundation in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Langgraph Foundation safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Langgraph Foundation?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Langgraph Foundation free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Langgraph Foundation?

ryan-brosas (@ryan-brosas) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Langgraph Foundation by ryan-brosas

Name: Langgraph Foundation
Author: ryan-brosas

Langgraph Foundation

Use when building agent orchestration engines, step graphs, or durable resumable runtimes — reusable contracts from LangGraph (MIT): the Pregel execution kernel — channel semantics (LastValue/Topic/BinOp/Ephemeral/Barrier/Delta), BSP superstep loop with version-based triggering, deterministic task IDs, interrupt/resume scratchpad protocol, runner panic/cancel semantics, retry ladder with ParentCommand routing, durability modes, exit-mode delta persistence, stream-mode output projection with custom-writer injection, branch/Command navigation grammar, Send fan-out guards, per-node input projection, managed values, functional-API call reuse on resume, messages-mode callback propagation (incl. v2 content-block streaming), subgraph checkpoint addressing, write caching, idle-timeout guards with attempt-observer contract, parent-config checkpoint chains, and runtime override/merge algebra.

ryan-brosas d0602b8 32 files · 144.3 KB Updated Sep 17, 2026

File contents

LangGraph: Pregel Execution Kernel Foundation

Foundation contract

This is a cold, source-specific foundation, not an operational procedure. It is historical, revision-pinned evidence rather than timeless guidance. Current project source, tests, requirements, and runtime behavior outrank this projection and decide what ships.

Provenance and revision

Source record: langgraph; portable upstream identity, license, coverage caveats, and retrieval history are preserved in the index.
Recorded revision: main@f09cfe8ffc1eeffd68f4b628ed69c30f7cad229f.
Full provenance, coverage caveats, boundaries, and preserved evidence: references/index.md.

Topic map

Representative topics: Driver loop; State semantics; Triggering; Identity; HITL; Replay; Orchestration; Failure routing.
Scope and retrieval questions: references/index.md#use-this-for.
Complete capsule chooser: references/index.md#load-the-matching-source-dump.
Detailed grouped map: references/index.md#capsule-map.
Source limitations and portability boundaries: references/index.md#boundaries.

Retrieval

Open the index, choose one capsule matching the active question, and load only that capsule. Revalidate its cited source and revision before relying on it. Do not bulk-load the inventory, treat historical claims as current truth, or apply this foundation as a procedure.

---name: langgraph-foundationdescription: Use when building agent orchestration engines, step graphs, or durable resumable runtimes — reusable contracts from LangGraph (MIT): the Pregel execution kernel — channel semantics (LastValue/Topic/BinOp/Ephemeral/Barrier/Delta), BSP superstep loop with version-based triggering, deterministic task IDs, interrupt/resume scratchpad protocol, runner panic/cancel semantics, retry ladder with ParentCommand routing, durability modes, exit-mode delta persistence, stream-mode output projection with custom-writer injection, branch/Command navigation grammar, Send fan-out guards, per-node input projection, managed values, functional-API call reuse on resume, messages-mode callback propagation (incl. v2 content-block streaming), subgraph checkpoint addressing, write caching, idle-timeout guards with attempt-observer contract, parent-config checkpoint chains, and runtime override/merge algebra.---# LangGraph: Pregel Execution Kernel Foundation## Foundation contractThis is a cold, source-specific foundation, not an operational procedure. It ishistorical, revision-pinned evidence rather than timeless guidance. Currentproject source, tests, requirements, and runtime behavior outrank thisprojection and decide what ships.## Provenance and revision- Source record: `langgraph`; portable upstream identity, license, coverage caveats, and retrieval history are preserved in the index.- Recorded revision: `main@f09cfe8ffc1eeffd68f4b628ed69c30f7cad229f`.- Full provenance, coverage caveats, boundaries, and preserved evidence: `references/index.md`.## Topic map- Representative topics: Driver loop; State semantics; Triggering; Identity; HITL; Replay; Orchestration; Failure routing.- Scope and retrieval questions: `references/index.md#use-this-for`.- Complete capsule chooser: `references/index.md#load-the-matching-source-dump`.- Detailed grouped map: `references/index.md#capsule-map`.- Source limitations and portability boundaries: `references/index.md#boundaries`.## RetrievalOpen the index, choose one capsule matching the active question, and load onlythat capsule. Revalidate its cited source and revision before relying on it. Donot bulk-load the inventory, treat historical claims as current truth, or applythis foundation as a procedure.

Frequently asked questions