Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/PostHog/posthog-fossnpx agentmods add skills/posthog/posthog-foss/authoring-ci-workflowsWrote 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/posthog/posthog-foss/authoring-ci-workflows)<a href="https://agentmods.dev/skills/posthog/posthog-foss/authoring-ci-workflows"><img src="https://agentmods.dev/badge/skills/posthog/posthog-foss/authoring-ci-workflows/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/posthog/posthog-foss/authoring-ci-workflows"><img src="https://agentmods.dev/badge/skills/posthog/posthog-foss/authoring-ci-workflows.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, 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 Prompt Injection · line 103 Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
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 | $0.00193 | $0.08002 |
| Opus 5 | $0.00097 | $0.04001 |
| Sonnet 5 | $0.00039 | $0.01600 |
| Haiku 4.5 | $0.00019 | $0.00800 |
Grade A, and why
authoring-ci-workflows scanned grade A with 1 finding 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 4d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
Downloads from outside the runner need retries, or a transient reset becomes a red check with no findings ([actionlint died on `curl: (35)`](https://github.com/PostHog/posthog/actions/runs/32022348027/job/95364480249)). How it starts
The opening of the file, as written. The whole thing — 422 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Authoring CI workflows
Before you propose a change to CI, check things already tried for the idea. It records what was measured, and why some good-sounding changes were reverted or rejected.
Conventions for .github/workflows/** and .github/actions/**.
The linters own the mechanical rules (below); this skill is the judgment calls they can't enforce.
Before you write
- Copy from a canonical file rather than from memory.
ci-paths-filter.ymlis the smallest complete example (triggers, concurrency, timeout, app token, Depot runner);ci-backend.ymlis the reference for the heavy patterns (bounded-depth checkout, per-SHA concurrency, draft/ready, sharding). - Related skills — reach for these instead of duplicating them here:
/gating-production-deploys— any job that pushes a prod image or dispatches a Charts deploy./managing-github-actions-secrets— creating the GitHub App / secret a workflow reads./depot-github-runners— Depot runner labels and sizing./debugging-ci-failures— CI is red and you need to know why.
What the linters already enforce
Run bin/hogli lint:workflows and actionlint before pushing — they gate CI, and they (not this list) are the source of truth for what's enforced.
Today that's: timeout-minutes on every job, the canonical PR concurrency block, a repo-wide budget for unscoped PR event dispatches, dorny/paths-filter negation safety, justification for full-depth checkouts, cache-write gating, semgrep service coverage, MCP path-filter coverage of the trees the MCP build compiles, required-check gate hygiene, and generic GHA correctness (bad secrets.* / needs: refs, deprecated ::set-output, unknown runner labels).
Third-party action digests are bumped by Renovate.
The dispatch budget (500 runs / 10s / repo)
GitHub caps workflow-run dispatch at 500 runs per 10s per repo; overflow fails as startup_failure and takes unrelated runs in the same window down with it (a stack restack pushing many branches is the usual trigger).
Minimize runs dispatched, not just work done — draft status doesn't help, runs dispatch before skip logic applies.
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.
- 4d ago Changed · +40 lines 3e6dde68faa0
- 5d ago Changed · +6 lines 9eb52eb2e45c
- 5d ago Changed · +74 lines fdff5d032924
- 9d ago First seen · 302 lines · 193 tokens per session scan A f37d9546f497
authoring-ci-workflows is a skill published in the GitHub repository PostHog/posthog-foss (714 stars, last pushed yesterday), licensed MIT. It adds 193 tokens to every session and 8,002 once invoked, about $0.0010 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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