What is port-agent-config?

A workflow for moving agent instructions, skills, and custom sub-agents from one coding tool to another.

Use it to port configurations such as Claude Code instructions to Codex CLI, Gemini CLI, or other supported tools, using existing generators when available.

It avoids losing project-specific agent behavior when changing tools and helps keep generated configuration in sync with its source.

port-agent-config — Skill for Claude Code by andr-ca/agentharness

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.

Any agent

npx skills add andr-ca/agentharness --skill port-agent-config

Clone the repo

git clone --depth 1 https://github.com/andr-ca/agentharness

Made for: Claude Code.

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/skills/andr-ca/agentharness/port-agent-config/github.svg)](https://agentmods.dev/skills/andr-ca/agentharness/port-agent-config)

Your own site

<a href="https://agentmods.dev/skills/andr-ca/agentharness/port-agent-config"><img src="https://agentmods.dev/badge/skills/andr-ca/agentharness/port-agent-config/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/skills/andr-ca/agentharness/port-agent-config"><img src="https://agentmods.dev/badge/skills/andr-ca/agentharness/port-agent-config.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 116 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,145 The whole file, excluding the scripts and references it only reads on demand.

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	$0.00116	$0.02145
Opus 5.5	$0.00046	$0.00858
Sonnet 5.5	$0.00023	$0.00429
Haiku 4.5	$0.00012	$0.00215

Measured 1mo ago against content hash 403030a10f26, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

port-agent-config 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 1mo 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.

.claude/skills/port-agent-config/SKILL.md · 143 lines

How it starts

The opening of the file, as written. The whole thing — 143 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Port Agent Config

Move a project's agent instructions and skills to work with a different coding tool, without breaking what already works for the current one. Two situations, two procedures — check which one applies before doing anything.

Step 0: which situation is this?

Look for a reachable agentharness checkout with tools/generate-*.sh in it:

This repo itself (agentharness) — the scripts are right here.
A consumer project where harness-link.sh init ran: readlink a .claude/skills/* entry to find the harness's real path, or look for an agentharness/ submodule, or a durable npm-mode copy.

Found one → Section A. Not found → Section B.

Section A — agentharness-linked: use the real generators

Don't hand-write the target file. Each generator already reuses the exact same source (CLAUDE.md + the skill catalog), is CI-drift-checked against its committed output, and carries the correct caveats — reconstructing its shape by hand is strictly worse and will drift the next time CLAUDE.md changes.

Target tool	Generator	Produces
Codex CLI	`tools/generate-agents-md.sh --output AGENTS.md`	`AGENTS.md`
Gemini CLI / Antigravity	`tools/generate-gemini-md.sh --output GEMINI.md`	`GEMINI.md`
GitHub Copilot	`tools/generate-copilot-instructions.sh --output-dir .`	`.github/copilot-instructions.md` + `.github/instructions/*.instructions.md`
Kilo Code	`tools/generate-kilo-rules.sh --output .kilo/rules/agentharness.md`	`.kilo/rules/agentharness.md`
Cursor	`tools/generate-cursor-rules.sh --output-dir .`	`.cursor/rules/agentharness-router.mdc` + one `.mdc` per skill
OpenCode / Zed	nothing to generate — both read `AGENTS.md` directly	—
Claude Code	nothing to generate — `CLAUDE.md` is the hand-authored source	—

Steps:

Run the matching command against the target project (see each script's own --help, or docs/INTEGRATION.md's per-platform section when the harness checkout and the target project aren't the same directory).
Re-run the project's own content-quality check (tools/verify-content-quality.py here; the consumer's equivalent elsewhere) to confirm the new file isn't silently broken.
Tell the user this is a manual step, not auto-wired into init/update (ROADMAP.md's P1-01) — they'll need to re-run it whenever CLAUDE.md or the skill catalog changes.
Keep the same caveat every generated file already states: not verified against a live session of the target tool.

Read the full file on GitHub · 143 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.

1mo ago First seen · 143 lines · 116 tokens per session scan A 403030a10f26

Subscribe to this mod's changes

port-agent-config is a skill published in the GitHub repository andr-ca/agentharness (1 stars, last pushed 2d ago), licensed MIT. It adds 116 tokens to every session and 2,145 once invoked, about $0.0005 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 2026-08-31.

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port-agent-config