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/pierry/harness-kit/installnpx skills add Pierry/harness-kit --skill installgit clone --depth 1 https://github.com/Pierry/harness-kitWhat 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 | $0.00058 | $0.00504 |
| Opus 5 | $0.00029 | $0.00252 |
| Sonnet 5 | $0.00012 | $0.00101 |
| Haiku 4.5 | $0.00006 | $0.00050 |
Grade A, and why
install scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Install harness-kit into the user's project. Plugin ships full harness; this skill lays it down via bundled installer.
What it writes
Installer copies into the target project (${CLAUDE_PROJECT_DIR}):
.claude/agents/, product-manager + staff-software-engineer (sensors, evals, guides, skills).claude/commands/,/product-manager:*,/sse:*,/pipeline:*,/context:*.claude/runtime/, per-agent hooks + scripts (outputs/ stay target-side state).claude/hooks/+.claude/scripts/, status bar, pipeline tracking, token accounting.claude/shared/, cross-agent guides.claude/conventions/, scaffold for project overrides.claude/settings.json, wires hooks + status bar (existing one backed up first)AGENTS.mdat repo root;CLAUDE.mdif absent
This modifies files in the user's repo. Tell user what runs before running. Existing .claude/settings.json backed up to .claude/settings.json.bak.<stamp>.
Run
Requires git + python3 (installer checks, exits if missing).
bash "${CLAUDE_PLUGIN_ROOT}/setup/install.sh" "${CLAUDE_PROJECT_DIR}"
Relay installer output verbatim. On missing agents / git not found / python3 not found, surface exact line.
After
Tell user: restart Claude Code to load agents, commands, hooks, status bar. Then:
/golden-path, the golden path: idea → merged PR in one command/product-manager:prd | :prp | :run/sse:plan | :dev | :test | :pr | :run | :sdd/pipeline:continue | :reset/context:pack | :graph(optional, need repomix / graphify)
Update later: /plugin update harness-kit then /harness-kit:update.
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 · 45 lines · 58 tokens per session scan A 7e06fe32893a
install is a skill published in the GitHub repository Pierry/harness-kit (3 stars, last pushed 1mo ago), licensed MIT. It adds 58 tokens to every session and 504 once invoked, about $0.0003 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.
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