factory-observability SKILL.md skillA
factory-observability from nonlinear-xyz/factory-kit is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add nonlinear-xyz/factory-kit/factory-observability@git:20260716.517fb94Pins git:20260716.517fb94 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- nonlinear-xyz/factory-kit
- Path
skills/factory-observability/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260716.517fb94, committed Jul 16, 2026
- Size
- 9,799 bytes
- Repository stars
- 9
- License
- MIT
Observability conventions across builds. PostHog + Sentry on day one (non-negotiable per the factory thesis — easiest to start early, most expensive to backfill). Request tracing with propagated trace IDs, structured logging, activity-log audit table, event tagging by tool/feature for per-tool usage queryability, PostHog ingest-URL rewrite to avoid ad-blocker breakage. What to log, what NOT to log (PII).
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Factory observability Each section leads with **Principle** (one sentence, stack-agnostic), then **Why** (constraint → option → tradeoff), then **Recipe** (the PostHog / Sentry / pino / structlog shape we use), and **Failure mode** when there's one to name. ## Day-one stack — observability before features **Principle.** PostHog + Sentry + trace IDs + structured logs go in on day one, before the first feature ships. **Why.** Observability is the build's most asymmetric cost-vs-value: cheap on day one (an SDK install and a config block), expensive to backfill (every event needs a redeploy, session-replay data starts empty, six months of usage history is lost). The trap is treating it as "we'll add when we need it" — by the time you need it, the data you'd want doesn't exist. **Recipe.** | Layer | Tool | Purpose | |---|---|---| | Product analytics | **PostHog** | Per-feature usage, funnels, session replay | | Error tracking | **Sentry** | Exceptions, performance, source maps | | Audit log | DB table (`admin_actions` or `audit_log`) | Mutation provenance, regulatory compliance | | Request tracing | Trace ID middleware + logs | Cross-service debugging | …
Read the whole file at its exact version.
How to install
mdr add nonlinear-xyz/factory-kit/factory-observability@sha256:6d90a1974707c315The line at the top of this page pins the label git:20260716.517fb94, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_lkpcfpviejl4fy7q)
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Versions
The registry has recorded 1 version of this file, committed on Jul 16, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (9799 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
nonlinear-xyz/factory-kit · 9 stars · license MIT · pushed 2026-10-29 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_lkpcfpviejl4fy7q GET https://markdownregistry.com/api/v1/resolve?ref=nonlinear-xyz/factory-kit/factory-observability GET https://markdownregistry.com/api/v1/blob/6d90a1974707c3151ee297574f255a70fdda11e8a5b356032932991d9616e270
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.