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.
npx agentmods add skills/pchalasani/claude-code-tools/msgnpx skills add pchalasani/claude-code-tools --skill msggit clone --depth 1 https://github.com/pchalasani/claude-code-toolsWhat 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 | $0.00037 | $0.00333 |
| Opus 5 | $0.00018 | $0.00167 |
| Sonnet 5 | $0.00007 | $0.00067 |
| Haiku 4.5 | $0.00004 | $0.00033 |
Grade A, and why
msg 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 2d 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.
What it actually says
msg: Inter-Agent Communication
You can communicate with other coding agent sessions
(Claude Code or Codex CLI) using the msg CLI tool.
Registration
Before sending or receiving messages, register yourself:
msg register <your-name>
This auto-detects your tmux pane. You only need to do this once per session.
Sending Messages
Send a message directly to another agent:
msg send <agent-name> "Your message here"
Send to multiple agents:
msg send agent1,agent2 "Message for both of you"
Replying
msg reply <agent-name> "Your reply here"
Receiving Messages
Check your inbox:
msg inbox
This shows all unread messages grouped by thread and marks them as read.
Other Commands
msg list # List registered agents
msg threads # List active threads
msg status # Check system health
Guidelines
- Keep messages concise -- they consume context in the receiving agent's session.
- When replying, include enough context that the recipient understands without re-reading the full thread.
- If you need to share code or file paths, reference them in the message text rather than pasting large blocks.
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.
- 2d ago First seen · 75 lines · 37 tokens per session scan A 5318481c279d
msg is a skill published in the GitHub repository pchalasani/claude-code-tools (1,989 stars, last pushed 2d ago), licensed MIT. It adds 37 tokens to every session and 333 once invoked, about $0.0002 per session on Opus 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.
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