isomux-pair-programming

isomux-pair-programming is a skill for Claude Code, Codex from nmamano/isomux. It costs 50 tokens per session (596 once invoked), scanned A, original, MIT.

A skill for building a feature together with another coding agent: one agent defines the scope and implements the work while the other reviews the design and code. Pair programming means two developers—or agents—work together on the same change.

In plain words
What is it for?
Use it when you want another agent to help scope a feature, review the proposed design, inspect the implementation, and give feedback during development.
Why use it?
It adds an independent review during both planning and implementation, which can expose design problems or code issues earlier.

Skill for Claude CodeCodex

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/nmamano/isomux/isomux-pair-programming
Any agent
npx skills add nmamano/isomux --skill isomux-pair-programming
Clone the repo
git clone --depth 1 https://github.com/nmamano/isomux

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 isomux-pair-programming

README.md
[![agentmods](https://agentmods.dev/badge/skills/nmamano/isomux/isomux-pair-programming.svg)](https://agentmods.dev/skills/nmamano/isomux/isomux-pair-programming)
Your own site
<a href="https://agentmods.dev/skills/nmamano/isomux/isomux-pair-programming"><img src="https://agentmods.dev/badge/skills/nmamano/isomux/isomux-pair-programming.svg" alt="Measured on agentmods" height="20"></a>
Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 596 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
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 $0.00050 $0.00596
Opus 5 $0.00025 $0.00298
Sonnet 5 $0.00010 $0.00119
Haiku 4.5 $0.00005 $0.00060

Measured 3d ago against content hash 9603c322182e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

isomux-pair-programming scanned grade A with 1 finding 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 3d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

Setup: if a peer name was supplied, look up their agent ID via the agent manifest: `curl -s localhost:4000/agents -H "Authorization: Bearer $ISOMUX_AGENT_TOKEN"` (4000 is the default isomux server port; adjust if your of
skills/isomux-pair-programming/SKILL.md · 43 lines

How it starts

The opening of the file, as written. The whole thing — 43 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Pair-program a feature with another agent. You drive, they review.

Syntax: /isomux-pair-programming {peer-agent-name} {feature prompt}

Setup: if a peer name was supplied, look up their agent ID via the agent manifest: curl -s localhost:4000/agents -H "Authorization: Bearer $ISOMUX_AGENT_TOKEN" (4000 is the default isomux server port; adjust if your office runs on a different one). Match the name case-insensitively. Otherwise try to infer the peer from context - e.g., an agent the boss and you have already paired or consulted with in this session. If there's a clear inference, use it (and briefly confirm who you picked). Otherwise, list candidates (prefer agents whose cwd matches yours) and ask the boss to pick. You need the peer's agent ID to POST messages to them. Work in the current cwd unless the boss explicitly asks for a worktree.

Every time you message the peer, include an explicit instruction telling them they must reply by POSTing back to your agent endpoint, not just by writing in their own chat. Replies that only appear in their own chat never reach you, so the iteration stalls.

Phase 1: scope (solo)

Scope the feature end-to-end by yourself. Read the relevant code, understand what touches what, and gather the context needed to design it. Don't loop in the peer yet. When done, auto-advance to Phase 2.

Phase 2: design (with peer)

Before writing any code, send the peer a short plan: files touched, approach, key edge cases. Ask for feedback.

Iterate. Stop and escalate to the boss with both positions summarized if either:

  • you reach 5 rounds without convergence, or
  • the decision involves architectural tradeoffs that affect other parts of the system.

Otherwise, once aligned, auto-advance to Phase 3.

Phase 3: implementation (with peer review)

Implement the feature. Then ask the peer to review the diff (point them at the cwd if they share it, or share the diff inline). Tell them their goal is to uphold code quality and principled architecture.

Read the full file on GitHub · 43 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. 3d ago First seen · 43 lines · 50 tokens per session scan A 9603c322182e

Subscribe to this mod's changes

isomux-pair-programming is a skill published in the GitHub repository nmamano/isomux (37 stars, last pushed 4d ago), licensed MIT. It adds 50 tokens to every session and 596 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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