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/gaelic-ghost/socket/build-acp-agentnpx skills add gaelic-ghost/socket --skill build-acp-agentgit clone --depth 1 https://github.com/gaelic-ghost/socketWhat 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 | $0.00042 | $0.00864 |
| Opus 5 | $0.00021 | $0.00432 |
| Sonnet 5 | $0.00008 | $0.00173 |
| Haiku 4.5 | $0.00004 | $0.00086 |
Grade A, and why
build-acp-agent 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.
How it starts
The opening of the file, as written. The whole thing — 87 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Build ACP Agent
Build the agent process that an ACP client launches. Do not build an editor
plug-in or MCP server when the requirement is an editor-native coding agent.
Read references/acp-implementation-map.md before selecting an SDK or registry
distribution.
Implementation Workflow
- Define concrete client targets and the user-visible behavior they require.
- Use ACP v1, the current latest protocol, and an official SDK when its language and runtime fit. Treat v2 and non-completed RFDs as experimental; do not ship them as the portable baseline. Use raw JSON-RPC only when an SDK cannot support a required platform or feature.
- Implement initialization first:
- negotiate
protocolVersion - advertise only implemented agent capabilities
- inspect client filesystem and terminal capabilities before using them
- advertise real authentication methods and implementation information
- negotiate
- Implement the required session baseline: new, prompt, cancel, and update.
- Add optional load, resume, fork, list, close, modes, configuration, plans,
slash commands, rich prompt content, or MCP transports only with matching
capability declarations and tests. Keep draft
session/delete, logout, elicitation, additional directories, and remote transports behind explicit experimental flags and interoperability tests. - Render tool calls, diffs, terminals, plans, and streamed content in the ACP structures the target clients understand.
- Route dangerous operations through permission requests and fail closed when approval transport fails or times out.
- Keep stdout exclusively for ACP JSON-RPC. Send logs and diagnostics to stderr without leaking credentials or prompt content unnecessarily.
- Bind every session to its client-provided cwd and any negotiated additional roots. Isolate cancellation, model choice, history, and mutable state by session.
- Test initialization, authentication, session lifecycle, streaming, cancellation, permissions, invalid messages, process shutdown, and each advertised optional capability against representative clients.
What ships with it
2 files 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.
- 2d ago First seen · 87 lines · 42 tokens per session scan A 847f28bff3c3
build-acp-agent is a skill published in the GitHub repository gaelic-ghost/socket (7 stars, last pushed 7d ago), licensed Apache-2.0. It adds 42 tokens to every session and 864 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 2026-08-31.
Other skills, from other repositories
baocut
BaoCut-only operator for the installed bcut CLI and .bcut projects. Implicitly trigger only when the request explicitly names BaoCut or bcut, targets a .bcut project or BaoCut Subtitle Studio, or continues a BaoCut workflow already established in the conversation. Do not trigger solely for generic audio or video…
xcode-disk-cleanup
Audit and safely clean Xcode-related developer storage on macOS. Use whenever a developer mentions low disk space, Xcode storage, DerivedData, simulator devices or runtimes, stale beta platforms in Xcode Settings, DeviceSupport, archives, dSYMs, CocoaPods caches, simulator dyld caches, project .build folders…
accelerate-local-work
Use AtomLane to compile and execute safe atomic parallel plans for macOS tasks containing composite shell or package scripts, Make or Compose graphs, native test/build runners, repeated independent work, dependency DAGs, or Apple-silicon operators. Use at task start or an execution boundary when structured local work…
use-gemini-web
Use the user's logged-in Gemini Web session as an untrusted auxiliary model when its public YouTube audio/visual understanding, public-URL context, or an independent second analysis materially helps Codex answer or verify a request. Use for one or multiple public videos, follow-up questions, cross-checking, or a fresh…
xrocket-exchange
Use the unofficial xRocket Exchange MCP to inspect spot markets and accounts, trade autonomously inside an operator-configured daily value limit, or prepare explicitly approved transfers and withdrawals. Trigger when a request concerns xRocket markets, account data, deposits, trading, transfers, withdrawals, or its…
apple-mail
Manage Apple Mail on macOS with Gmail-like draft resources, future send scheduling, and explicit sending identities. Use for searching or reading mail, listing sender aliases, selecting a From identity, creating/reviewing/updating/sending/scheduling/deleting drafts, replying, forwarding, organizing messages, or…