What is xbcode AGENTS.md?

Repository instructions for xbcode, a TypeScript command-line AI agent with a terminal interface. They explain the project structure, commands, API modes, and its five built-in tools, including a tool that delegates work to another agent.

Use them when editing xbcode, running its development or build commands, or changing its agent loop, tools, types, or task handling.

They help a coding agent understand how the program is organized before changing or testing it.

How lwmxiaobei/xbcode configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to lwmxiaobei/xbcode. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/lwmxiaobei/xbcode/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/lwmxiaobei/xbcode

Made for: Codex, OpenCode.

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/lwmxiaobei/xbcode/agents-md/github.svg)](https://agentmods.dev/instructions/lwmxiaobei/xbcode/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/lwmxiaobei/xbcode/agents-md"><img src="https://agentmods.dev/badge/instructions/lwmxiaobei/xbcode/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/lwmxiaobei/xbcode/agents-md"><img src="https://agentmods.dev/badge/instructions/lwmxiaobei/xbcode/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 634 This file is loaded in full into every session.

When invoked 634 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original 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.

Model	Per session	Once invoked
Fable 5.1	$0.00634	$0.00634
Opus 5.5	$0.00254	$0.00254
Sonnet 5.5	$0.00127	$0.00127
Haiku 4.5	$0.00063	$0.00063

Measured 2mo ago against content hash 33a31e16b443, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

xbcode AGENTS.md 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 2mo 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.md · 49 lines

How it starts

The opening of the file, as written. The whole thing — 49 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

This file provides guidance to Codex (Codex.ai/code) when working with code in this repository.

Project Overview

A TypeScript CLI agent (similar to Codex) built with OpenAI SDK + Ink (React for CLI). It implements an agent loop with tool use, streaming output, and a terminal UI.

Commands

npm run dev      # Run in development (tsx, no compile)
npm run build    # Compile TypeScript to dist/
npm start        # Run compiled output

Architecture

Multi-file architecture: src/index.tsx (UI), src/agent.ts (agent loop), src/tools.ts (tool definitions & handlers), src/types.ts, src/todo.ts.

Dual API mode: Supports both OpenAI Responses API (default) and Chat Completions API (for DeepSeek-compatible endpoints). Auto-detected via OPENAI_BASE_URL or set explicitly with OPENAI_API_MODE.

Agent loop: agentLoop() (Responses API) and agentLoopWithChatCompletions() (Chat Completions) implement the core think-act cycle. Both loop until LLM returns no tool calls.

Tools: 5 built-in tools — bash, read_file, write_file, edit_file, task. The task tool dispatches work to an independent sub-agent with a clean context (no parent history). Sub-agents have base tools only (no recursive task). Max 30 rounds per sub-agent. All tools return strings (errors included). Tool schema uses JSON Schema format with additionalProperties: false.

UI layer: React components rendered via Ink. UiBridge interface connects agent logic to UI updates (streaming deltas, tool call display).

State: AgentState holds previousResponseId (Responses API chain) or chatHistory (Chat Completions message array).

Environment Variables

Configure in .env at project root:

OPENAI_API_KEY — required
MODEL_ID — default gpt-4.1
OPENAI_BASE_URL — optional, for compatible endpoints
OPENAI_API_MODE — responses or chat-completions (auto-detected)
SHOW_THINKING=1 — display model reasoning
REASONING_EFFORT — thinking intensity for reasoning models (minimal / low / medium / high / xhigh / max)

Read the full file on GitHub · 49 lines

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.

2mo ago First seen · 49 lines · 634 tokens per session scan A 33a31e16b443

Subscribe to this mod's changes

xbcode AGENTS.md is an instructions file published in the GitHub repository lwmxiaobei/xbcode (48 stars, last pushed 2mo ago), licensed MIT. It adds 634 tokens to every session, about $0.0025 per session on Opus 5.5. 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 2026-08-30.

xbcode AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
xbcode AGENTS.mdlwmxiaobei/xbcode	Instructions file	48	2mo ago	MIT	A	634	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

xbcode: Instructions file for Codex