A work harness for long-running Claude Code projects. It breaks a large goal into phases that can run in loops, checks sessions, and keeps decisions with you.

Use it to divide extended coding work into repeatable phases, run verification after iterations, and handle session failures with hooks.

It helps prevent long tasks from drifting, losing context, or claiming progress without checks.

nightshift — Plugin by MissingPackage

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.

Claude Code

/plugin marketplace add MissingPackage/nightshift

agentmods

npx agentmods add plugins/missingpackage/nightshift/marketplace

Clone the repo

git clone --depth 1 https://github.com/MissingPackage/nightshift

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

nightshift 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 yesterday.

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.

.claude-plugin/marketplace.json · 29 lines

What it actually says

{
  "name": "nightshift",
  "owner": {
    "name": "MissingPackage"
  },
  "metadata": {
    "description": "Nightshift — a harness for long-horizon Claude Code work",
    "version": "1.0.0"
  },
  "plugins": [
    {
      "name": "nightshift",
      "version": "1.0.0",
      "description": "A harness for long-horizon Claude Code work: goals decomposed into loop-runnable phases, hooks that catch the bad session, verified iterations, and decisions that stay yours.",
      "keywords": [
        "harness",
        "orchestration",
        "hooks",
        "skills",
        "agents",
        "long-horizon",
        "verification"
      ],
      "license": "MIT",
      "source": "./"
    }
  ]
}

Files

What ships with it

1 file beside marketplace.json 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.

plugin.json 616 B

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.

yesterday First seen · 29 lines scan A 9d2beaaf9884

Subscribe to this mod's changes

nightshift is a plugin published in the GitHub repository MissingPackage/nightshift (2 stars, last pushed 15d ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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.

Orchestration agent-harness ai-agents claude claude-code hooks

nightshift

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What ships with it

What this file has done since we first saw it

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