synthesis-autopilot

synthesis-autopilot is a skill for Claude Code, Codex from synthesisengineering/synthesis-skills. It costs 128 tokens per session (5,646 once invoked), scanned A, original, Apache-2.0.

A mode for carrying out an explicitly delegated task with fewer check-ins, a durable plan, checkpoints, and safeguards for long or unattended work.

In plain words
What is it for?
Use it for overnight or multi-day implementation work that needs continued planning, verification, and protection against shortcuts or runaway execution.
Why use it?
It keeps the agent's instructions and progress from being lost during lengthy tasks or when the conversation context changes.

Skill for Claude CodeCodex

Written for Claude Code and Codex: shipped in a Claude Code plugin, but also agents/openai.yaml present. Also seen: mentions CLAUDE.md; mentions subagents; mentions AGENTS.md.

Part of the synthesis-skills plugin — 63 skills, 4 hooks shipped together

Good fit Use it for overnight or multi-day implementation work that needs continued planning, verification, and protection against shortcuts or runaway execution.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/synthesisengineering/synthesis-skills/synthesis-autopilot
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 synthesisengineering/synthesis-skills --skill synthesis-autopilot
Clone the repo
git clone --depth 1 https://github.com/synthesisengineering/synthesis-skills

Made for: Claude Code, Codex.

Or install synthesis-skills, the plugin that ships this one along with the rest of its 63 skills, 4 hooks.

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 synthesis-autopilot

README.md
[![agentmods](https://agentmods.dev/badge/skills/synthesisengineering/synthesis-skills/synthesis-autopilot/github.svg)](https://agentmods.dev/skills/synthesisengineering/synthesis-skills/synthesis-autopilot)
Your own site
<a href="https://agentmods.dev/skills/synthesisengineering/synthesis-skills/synthesis-autopilot"><img src="https://agentmods.dev/badge/skills/synthesisengineering/synthesis-skills/synthesis-autopilot/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.

agentmods 80×15 button for synthesis-autopilot

Your own site · 80×15
<a href="https://agentmods.dev/skills/synthesisengineering/synthesis-skills/synthesis-autopilot"><img src="https://agentmods.dev/badge/skills/synthesisengineering/synthesis-skills/synthesis-autopilot.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 128 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,646 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. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 2 findings, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Excessive Agency · line 37
    Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.
    Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
  • medium Rogue Agent · line 158
    Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.
    Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
How audits are shown
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 5.1 $0.00128 $0.05646
Opus 5 $0.00064 $0.02823
Sonnet 5 $0.00026 $0.01129
Haiku 4.5 $0.00013 $0.00565

Measured 6d ago against content hash be7e948542a9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

synthesis-autopilot 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 6d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/autopilot_gate.py, scripts/test_autopilot_gate.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/synthesis-autopilot/SKILL.md · 353 lines

How it starts

The opening of the file, as written. The whole thing — 353 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Synthesis Autopilot — Autonomous Execution Mode

The Problem

Users who delegate whole tasks to an agent end up retyping the same paragraph of standing instructions every time: complete all the phases, don't check in constantly, use my decision framework, keep a plan file, don't lose state when the context compacts, build the real solution rather than a workaround. Retyped instructions have three failure modes. They drift — each retelling drops a clause, and the dropped clause (usually verification, or the decision protocol) silently doesn't happen. They decay — a long autonomous run outlives its own instructions when the context window compacts, and the agent reverts to conservative defaults mid-task. And they don't compose — the instruction block names disciplines that live in separate skills, and a paraphrase of a skill is weaker than the skill.

This skill encodes the delegation contract once. One explicit phrase from the user engages the mode; the mode sequences the skills that already exist rather than restating them.

What This Is — and Is Not

A mode. Activation changes the agent's check-in cadence and self-management for the current delegated task: fewer questions, batched questions, a plan file that survives compaction, verification before "done." It does not change the quality bar — the anti-shortcut and integrity disciplines apply to all work, supervised or not.

A thin composition layer. Every discipline this mode invokes is defined in its own skill, listed in depends_on. This file sequences them and states the protocol that is unique to autonomous runs (trigger discipline, the plan file, batched decisions, alerts). When this file and a dependency appear to disagree, the dependency is authoritative for its own domain.

Not an authority expansion. Autonomy governs how the agent sequences work and how often it interrupts — never what it is permitted to do. See "Standing Gates Survive Autonomy" below.

Activation — Trigger Discipline

Read the full file on GitHub · 353 lines

Files

What ships with it

3 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.

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. 6d ago Changed · +3 lines be7e948542a9
  2. 10d ago First seen · 350 lines · 128 tokens per session scan A ed74639b50d2

Subscribe to this mod's changes

synthesis-autopilot is a skill published in the GitHub repository synthesisengineering/synthesis-skills (18 stars, last pushed today), licensed Apache-2.0. It adds 128 tokens to every session and 5,646 once invoked, about $0.0006 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.