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x-agent: Instructions file for Codex

AGENTS.md

x-agent AGENTS.md is an instructions file for Codex, OpenCode from darshitpp/x-agent. It costs 630 tokens per session, scanned A, original, MIT.

Repository instructions for maintaining x-agent, a collection of small agent skills for different command-line AI tools. They explain where supported tools are listed, where shared references live, and how to keep installed copies identical.

In plain words
What is it for?
They guide adding or updating a CLI skill, changing its flags or references, synchronizing shared files, and checking the result in CI.
Why use it?
They prevent maintainers from guessing which files or tools are supported and help avoid inconsistent documentation or broken skill copies. They also define how changes should be tested.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions AGENTS.md.

This is darshitpp/x-agent's own configuration. It tells Codex and OpenCode how to work on x-agent itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything x-agent configures →

not rated 2repo 21d ago A scan 630 tokens original MIT
View source ↗ darshitpp/x-agent
Reuse

Borrowing it

Nothing to install: this file belongs to darshitpp/x-agent. 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/darshitpp/x-agent/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/darshitpp/x-agent

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.

agentmods badge for x-agent AGENTS.md

README.md
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Your own site
<a href="https://agentmods.dev/instructions/darshitpp/x-agent/agents-md"><img src="https://agentmods.dev/badge/instructions/darshitpp/x-agent/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.

agentmods 80×15 button for x-agent AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/darshitpp/x-agent/agents-md"><img src="https://agentmods.dev/badge/instructions/darshitpp/x-agent/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 630 This file is loaded in full into every session.
When invoked 630 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00630 $0.00630
Opus 5.5 $0.00252 $0.00252
Sonnet 5.5 $0.00126 $0.00126
Haiku 4.5 $0.00063 $0.00063

Measured 20d ago against content hash 1f6070c21cce, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

x-agent 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 20d 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 · 45 lines

How it starts

The opening of the file, as written. The whole thing — 45 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

x-agent is a set of agentskills.io skills, one per supported CLI. Each <cli>/SKILL.md is a thin entry point that points at shared references. No application code; the product is Markdown plus a maintainer shell wrapper.

Discover, don't assume

This file lists no CLIs or files that change. Look them up:

  • Supported CLIs: ls */SKILL.md (each top-level dir with a SKILL.md is one CLI).
  • Everything that must change for a CLI: git grep -n -i <existing-cli-name> (use a similar, recent CLI such as the latest git log --stat addition as the template) and mirror each hit.
  • Layout and CI details: README.md (directory tree, CI section) and .github/workflows/.

Rules

  • references/ and assets/ at the repo root are canonical. Each skill folder holds byte-identical copies, because skills install standalone. After editing a canonical file, copy it into every skill folder that has it. pytest fails on drift and prints the cp command.
  • SKILL.md stays thin: frontmatter plus "read shared-procedure, read the CLI reference, follow it". Flags, models and version info belong in references/cli-<cli>.md.
  • Frontmatter limits are enforced by scripts/validate-metadata.py (run it with --help).
  • scripts/query-cli.sh is maintainer-only and not shipped; skills never call it.
  • No self-call detection: invoking the same CLI with a different model is a supported cross-validation use case.
  • Document only flags you verified. Check the installed CLI is current (npm view <pkg> version, or npx -y <pkg>@latest --help; for others use the CLI's own update command), then read <cli> --help; otherwise cite the public docs. Mark anything unverified as such in the reference.
  • Changes go through a PR; CI runs integrity, pytest and bats on Ubuntu and macOS.

Adding a CLI or changing its flags

A CLI is touched in five places; find the exact current files with git grep as above rather than trusting a list:

Read the full file on GitHub · 45 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.

  1. 20d ago First seen · 45 lines · 630 tokens per session scan A 1f6070c21cce

Subscribe to this mod's changes

x-agent AGENTS.md is an instructions file published in the GitHub repository darshitpp/x-agent (2 stars, last pushed 21d ago), licensed MIT. It adds 630 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 2026-10-08.

Building agentsProject managementagent-skillsagentskillsai-agentsclicodex
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