langgraph-fundamentals SKILL.md skillA
langgraph-fundamentals from akillness/jeo-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add akillness/jeo-skills/langgraph-fundamentals@git:20260920.2a2b733Pins git:20260920.2a2b733 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- akillness/jeo-skills
- Path
.agent-skills/langgraph-fundamentals/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260920.2a2b733, committed Sep 20, 2026
- First version recorded
- Sep 19, 2026
- Size
- 6,301 bytes
- Repository stars
- 52
- License
- none declared
INVOKE THIS SKILL when writing ANY LangGraph code. Covers StateGraph, state schemas, nodes, edges, Command, Send, invoke, streaming, and error handling.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
<overview> LangGraph models agent workflows as **directed graphs**: - **StateGraph**: Main class for building stateful graphs - **Nodes**: Functions that perform work and update state - **Edges**: Define execution order (static or conditional) - **START/END**: Special nodes marking entry and exit points - **State with Reducers**: Control how state updates are merged Graphs must be `compile()`d before execution. </overview> <design-methodology> ### Designing a LangGraph application Follow these 5 steps when building a new graph: 1. **Map out discrete steps** — sketch a flowchart of your workflow. Each step becomes a node. 2. **Identify what each step does** — categorize nodes: LLM step, data step, action step, or user input step. For each, determine static context (prompt), dynamic context (from state), retry strategy, and desired outcome. 3. **Design your state** — state is shared memory for all nodes. Store raw data, format prompts on-demand inside nodes. 4. **Build your nodes** — implement each step as a function that takes state and returns partial updates. 5. **Wire it together** — connect nodes with edges, add conditional routing, compile with a checkpointer if needed. …
Read the whole file at its exact version.
How to install
mdr add akillness/jeo-skills/langgraph-fundamentals@sha256:2a61953495a2b63bThe line at the top of this page pins the label git:20260920.2a2b733, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ykawdtmadjtncwe5)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Sep 19, 2026 and Sep 20, 2026, about one every day.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260920.2a2b733 latest | 2026-09-20 | 2a2b733 | 6,301 B | A | view · diff |
| git:20260919.9f2a908 | 2026-09-19 | 9f2a908 | 5,903 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6301 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
akillness/jeo-skills · 52 stars · license none declared · pushed 2026-11-05 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ykawdtmadjtncwe5 GET https://markdownregistry.com/api/v1/resolve?ref=akillness/jeo-skills/langgraph-fundamentals GET https://markdownregistry.com/api/v1/blob/2a61953495a2b63b62d20611256499b50a53f097108f5c3a30b2c05f1cf14f7e
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.