Agentic Blueprints 6

Turns a user story into browser tests: plans the scenarios, writes Playwright code, runs it against the real page, and self-heals until it passes for the right reason.

Diff-aware multi-pass reviewer: finds bugs, then a skeptic agent verifies each before reporting.

Reads a GitHub issue and loops a coder against a verifier until it produces a minimal failing test that actually reproduces the bug.

Answers questions about a codebase with citations to the exact file — and says so honestly when the answer isn't in the repo.

Code Assistant with Self-Correction

io.github.langchain-ai/code-assistant

LangGraph

Generates code grounded in docs, executes it, and loops on the errors — reflecting on failures before retrying until tests pass.

USACO Competitive Programming Agent

io.github.langchain-ai/usaco-agent

LangGraph

Solves olympiad programming problems with episodic retrieval of similar solved problems plus a reflect-and-retry execution loop.