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 skills add richfrem/agent-plugins-skills --skill os-control-signing-setupgit clone --depth 1 https://github.com/richfrem/agent-plugins-skillsWrote 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/richfrem/agent-plugins-skills/os-control-signing-setup)<a href="https://agentmods.dev/skills/richfrem/agent-plugins-skills/os-control-signing-setup"><img src="https://agentmods.dev/badge/skills/richfrem/agent-plugins-skills/os-control-signing-setup/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.
<a href="https://agentmods.dev/skills/richfrem/agent-plugins-skills/os-control-signing-setup"><img src="https://agentmods.dev/badge/skills/richfrem/agent-plugins-skills/os-control-signing-setup.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00111 | $0.00610 |
| Opus 5.5 | $0.00044 | $0.00244 |
| Sonnet 5.5 | $0.00022 | $0.00122 |
| Haiku 4.5 | $0.00011 | $0.00061 |
Grade A, and why
os-control-signing-setup 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.
How it starts
The opening of the file, as written. The whole thing — 61 lines — stays where its author put it; the contents beside it link to each section on GitHub.
OS Signing Setup (os-control-signing-setup)
Guides human operators through creating and verifying passphrase-protected or FIDO hardware SSH signing keys required for cryptographic approval gates (APPROVED, VERIFY_EXIT, DONE).
Contents
Critical Constraints
- Never Run Setup Autonomously: Key creation and self-tests require interactive human terminal prompts; agents must never run them directly.
- Never Touch Private Keys: Never create, read, copy, or move private keys, and never edit
allowed_signers*. - No Automated Approvals: Never pipe passphrases or fabricate signatures; signatures are proof of actual human presence.
Quick start
Check signing status and key readiness:
python3 scripts/setup_ciba_identity.py --check
Workflow
- Check Status: Run status check to verify whether trust anchors or keys are missing.
- Guide Key Creation: Provide instructions for the human to run
python3 scripts/setup_ciba_identity.pyin their own terminal. - Run Self-Test: Direct the human to execute
python3 scripts/test_signing_mechanics.py. - Inspect Results: Advise the human based on script output and verify readiness.
Verification
Confirm trust anchors exist and key is verified (exit code 0):
python3 scripts/setup_ciba_identity.py --check
References
- acceptance-criteria.md — Acceptance criteria for cryptographic approval workflows.
- fallback-tree.md — Remediation pathways when signing checks fail.
- isolation-setup.md — OS account isolation steps and residual risk notes.
- os-control-signing-setup-guide.md — Plain-language setup guide and identity definitions.
- SIGNING_WORKFLOW_OVERVIEW.md — Cryptographic boundary architecture.
What ships with it
45 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.
- evals/evals.json 751 B
- references/acceptance-criteria.md 67 B
- references/fallback-tree.md 61 B
- references/isolation-setup.md 38 B
- references/map-debt.md 31 B
- references/os-control-signing-setup-guide.md 53 B
- references/SIGNING_WORKFLOW_OVERVIEW.md 48 B
- scripts/control_plane/__init__.py 45 B runs code
- scripts/control_plane/adapters.py 45 B runs code
- scripts/control_plane/approver_policy.py 52 B runs code
- scripts/control_plane/baseline_transition_report.py 63 B runs code
- scripts/control_plane/constants.py 46 B runs code
- scripts/control_plane/coordinator.py 48 B runs code
- scripts/control_plane/edge_matrix.py 48 B runs code
- scripts/control_plane/gate_evidence.py 50 B runs code
- scripts/control_plane/gate1_approval.py 51 B runs code
- scripts/control_plane/identity_layout.py 52 B runs code
- scripts/control_plane/identity_setup.py 51 B runs code
- scripts/control_plane/implementation_loop.py 56 B runs code
- scripts/control_plane/implementation.py 51 B runs code
- scripts/control_plane/inspection.py 47 B runs code
- scripts/control_plane/installation_probe.py 55 B runs code
- scripts/control_plane/isolation_check.py 52 B runs code
- scripts/control_plane/measurement.py 48 B runs code
- scripts/control_plane/pipeline_simulator.py 55 B runs code
- scripts/control_plane/policy.py 43 B runs code
- scripts/control_plane/ports.py 42 B runs code
- scripts/control_plane/proof_edges.py 48 B runs code
- scripts/control_plane/proof_policy.py 49 B runs code
- scripts/control_plane/receipt_provenance.py 55 B runs code
- scripts/control_plane/registry.py 45 B runs code
- scripts/control_plane/review_options.py 51 B runs code
- scripts/control_plane/review_selection.py 53 B runs code
- scripts/control_plane/run_transition_simulation.py 62 B runs code
- scripts/control_plane/signing_selftest.py 53 B runs code
- scripts/control_plane/simulation_identity.py 56 B runs code
- scripts/control_plane/snapshot.py 45 B runs code
- scripts/control_plane/ssh_signing.py 48 B runs code
- scripts/control_plane/state_machine.py 50 B runs code
- scripts/control_plane/transition_request.py 55 B runs code
- scripts/control_plane/transition_simulation_cases.py 64 B runs code
- scripts/control_plane/transition_templates.yaml 59 B
- scripts/control_plane/tty_signer.py 47 B runs code
- scripts/setup_ciba_identity.py 39 B runs code
- scripts/test_signing_mechanics.py 42 B runs code
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 · 61 lines · 111 tokens per session scan A 0310b0e606e7
os-control-signing-setup is a skill published in the GitHub repository richfrem/agent-plugins-skills (7 stars, last pushed 2d ago), licensed MIT. It adds 111 tokens to every session and 610 once invoked, about $0.0004 per session on Opus 5.5. 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 2026-10-16.
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