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 bop-clocktower/canary --skill canary-blackhawkgit clone --depth 1 https://github.com/bop-clocktower/canaryWrote 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/bop-clocktower/canary/canary-blackhawk)<a href="https://agentmods.dev/skills/bop-clocktower/canary/canary-blackhawk"><img src="https://agentmods.dev/badge/skills/bop-clocktower/canary/canary-blackhawk/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/bop-clocktower/canary/canary-blackhawk"><img src="https://agentmods.dev/badge/skills/bop-clocktower/canary/canary-blackhawk.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 | $0.00090 | $0.01979 |
| Opus 5 | $0.00045 | $0.00989 |
| Sonnet 5 | $0.00018 | $0.00396 |
| Haiku 4.5 | $0.00009 | $0.00198 |
Grade A, and why
canary-blackhawk 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 10d 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 — 171 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Canary Blackhawk
A test that reads the wall clock is a test with a scheduled outage. It passes every run you watch, then fails at 23:59:59, on the Sunday the clocks move, or on Feb 29. Blackhawk finds those lines before the calendar does.
Tier-0 deterministic analysis: no LLM, no network, no secrets, no dependency on any other skill.
Rules
| Rule | Severity | Fires on |
|---|---|---|
BH001-wall-clock |
high | Date.now(), bare new Date(), moment(), datetime.now() / .today() / .utcnow(), date.today(), time.time(), pd.Timestamp.now() |
BH002-real-delay |
medium | time.sleep(n) and setTimeout(fn, n) with a literal n > 0 |
BH003-local-timezone |
medium | toLocaleString / toLocaleDateString / toLocaleTimeString, strftime('…%Z…') or %z |
BH004-naive-datetime-compare |
low | a comparison against datetime(2024, …) or strptime(…) with no tzinfo / timezone.utc / ZoneInfo / pytz on the line |
A pinned constructor is never flagged: new Date('2024-01-01T00:00:00Z'),
moment('2024-01-01'), and datetime(2024, 1, 1) on its own are all fine.
Framework-conditioned suppression (the important part)
The single biggest failure mode of a temporal linter is firing on tests that
already handle time correctly. So when a file installs a frozen clock, every
clock-dependent rule (BH001, BH002, BH004) goes quiet for that file.
Markers:
vi.useFakeTimers · vi.setSystemTime · jest.useFakeTimers ·
jest.setSystemTime · sinon.useFakeTimers · MockDate · freeze_time /
freezegun · time_machine
What ships with it
4 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.
- 10d ago First seen · 171 lines · 90 tokens per session scan A ffa3d6dce359
canary-blackhawk is a skill published in the GitHub repository bop-clocktower/canary (4 stars, last pushed today), licensed MIT. It adds 90 tokens to every session and 1,979 once invoked, about $0.0005 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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