langchain-rag

langchain-rag is a skill for Claude Code, Codex from kevyder/constitution_chat. It costs 52 tokens per session (3,556 once invoked), scanned A, original, no licence file.

A guide for building retrieval-augmented generation systems, which let an AI find relevant information in documents before producing an answer.

In plain words
What is it for?
Use it when building RAG systems with document loaders, OpenAI embeddings, or vector databases such as Chroma, FAISS, and Pinecone.
Why use it?
It provides a defined approach for loading documents, splitting them into useful sections, creating embeddings, and storing them for search.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing. Also seen: installed under .agents/ (shared by several agents).

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/kevyder/constitution_chat/langchain-rag
Any agent
npx skills add kevyder/constitution_chat --skill langchain-rag
Clone the repo
git clone --depth 1 https://github.com/kevyder/constitution_chat

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for langchain-rag

README.md
[![agentmods](https://agentmods.dev/badge/skills/kevyder/constitution_chat/langchain-rag.svg)](https://agentmods.dev/skills/kevyder/constitution_chat/langchain-rag)
Your own site
<a href="https://agentmods.dev/skills/kevyder/constitution_chat/langchain-rag"><img src="https://agentmods.dev/badge/skills/kevyder/constitution_chat/langchain-rag.svg" alt="Measured on agentmods" height="20"></a>
Per session 52 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,556 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00052 $0.03556
Opus 5 $0.00026 $0.01778
Sonnet 5 $0.00010 $0.00711
Haiku 4.5 $0.00005 $0.00356

Measured 5d ago against content hash 7d86a0c537fb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

langchain-rag scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.agents/skills/langchain-rag/SKILL.md · 540 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 5d ago First seen · 540 lines · 52 tokens per session scan A 7d86a0c537fb

Subscribe to this mod's changes

langchain-rag is a skill published in the GitHub repository kevyder/constitution_chat (5 stars, last pushed 18d ago), with no licence file. It adds 52 tokens to every session and 3,556 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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