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/fradser/dotclaude/use-acpxnpx skills add FradSer/dotclaude --skill use-acpxgit clone --depth 1 https://github.com/FradSer/dotclaudeWrote 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.
[](https://agentmods.dev/skills/fradser/dotclaude/use-acpx)<a href="https://agentmods.dev/skills/fradser/dotclaude/use-acpx"><img src="https://agentmods.dev/badge/skills/fradser/dotclaude/use-acpx.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00083 | $0.04816 |
| Opus 5 | $0.00042 | $0.02408 |
| Sonnet 5 | $0.00017 | $0.00963 |
| Haiku 4.5 | $0.00008 | $0.00482 |
Grade A, and why
acpx 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 5d 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.
How it starts
The opening of the file, as written. The whole thing — 340 lines — stays where its author put it; the contents beside it link to each section on GitHub.
acpx
What acpx is
acpx is a headless, scriptable CLI client for the Agent Client Protocol (ACP). It is built for agent-to-agent communication over the command line and avoids PTY scraping.
Core capabilities:
- Persistent multi-turn sessions per repo/cwd
- One-shot execution mode (
exec) - Multi-agent comparison (
compare) - Named parallel sessions (
-s/--session) - Idempotent session creation (
sessions ensure) - Session retention controls (
sessions prunewith age filters and history cleanup) - Portable session export/import for moving records and history across machines
- Queue-aware prompt submission with optional fire-and-forget (
--no-wait) - Cooperative cancel command (
cancel) for in-flight turns - Graceful cancellation via ACP
session/cancelon interrupt - Session control methods (
set-mode,set <key> <value>) - Agent reconnect/resume after dead subprocess detection
- Prompt input via stdin or
--file - Config files with global+project merge and
config show|init - Session-scoped MCP servers from an external file (
--mcp-config) - Session metadata/history inspection (
sessions show,sessions history) - Local agent process checks via
status - Stable ACP client methods for filesystem and terminal requests
- Stable ACP
authenticatehandshake via env/config credentials - Structured streaming output (
text,json,quiet) with optional--suppress-reads - Built-in agent registry plus raw
--agentescape hatch - Claude system prompt override via
--system-prompt/--append-system-prompt - Optional terminal capability disable via
--no-terminalfor review-only flows - Optional filesystem capability disable via
--no-fsfor agent-native file operations - Tool whitelist (
--allowed-tools), turn cap (--max-turns), retry on transient failures (--prompt-retries) - Multi-agent flows via
acpx flow runand theacpx/flowsauthoring API (defineFlow,decision,decisionEdge,acp,action,compute,checkpoint)
Install
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 5d ago First seen · 340 lines · 83 tokens per session scan A 4bb280aa7ef7
acpx is a skill published in the GitHub repository FradSer/dotclaude (588 stars, last pushed 24d ago), licensed MIT. It adds 83 tokens to every session and 4,816 once invoked, about $0.0004 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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