pgo SKILL.md skillA
pgo from dimetron/pi-go is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add dimetron/pi-go/pgo@git:20260903.4a1a165Pins git:20260903.4a1a165 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- dimetron/pi-go
- Path
.pi-go/skills/pgo/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260903.4a1a165, committed Sep 3, 2026
- Size
- 5,600 bytes
- Repository stars
- 214
- License
- MIT
Profile-guided optimization (PGO) for the pi binary. Use when recording a new PGO profile (`make record-pgo`), when a build behaves differently after a profile is added or removed, when `default.pgo` is missing or stale, or when asked to optimize the pi binary with a CPU profile. Covers the go.dev/doc/pgo workflow: collecting a representative CPU profile, merging profiles, and building with PGO via `default.pgo` in the main package directory.
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
# PGO — Profile-Guided Optimization **Source**: [go.dev/doc/pgo](https://go.dev/doc/pgo) (authoritative). PGO feeds a **CPU pprof profile** from representative runs of the application back into the compiler for the next build, which uses it to make more informed optimization decisions (e.g. more aggressive inlining of hot functions). As of Go 1.22, representative programs improve ~2–14%. The compiler expects a CPU pprof profile — exactly what `runtime/pprof` and `net/http/pprof` produce. ## The core rule: the profile must be representative A profile that is not representative of real behavior yields little or no gain. **Microbenchmarks are bad PGO candidates** — they exercise a small part of the program. Collect from a representative workload instead. For pi-go that means **both** of the binary's hot paths, not one: - **The headless agent/tool loop** — the tool-coverage eval suite: one `pi --mode print` scenario per tool family. - **The TUI render loop** — `RenderMessages`, `collapseBlankLines`, and `matchLexer`. A live profile attributed ~24% of CPU to the `ansi.Strip` call `blankFast` replaces; bubbletea calls `View()` once per token during …
Read the whole file at its exact version.
How to install
mdr add dimetron/pi-go/pgo@sha256:530ea963b20b717eThe line at the top of this page pins the label git:20260903.4a1a165, 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_t3amirnbrpub6y34)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Sep 3, 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 (5600 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
dimetron/pi-go · 214 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_t3amirnbrpub6y34 GET https://markdownregistry.com/api/v1/resolve?ref=dimetron/pi-go/pgo GET https://markdownregistry.com/api/v1/blob/530ea963b20b717ed3a8dfa8ed0f0db11a506d19340fedee3b9aef236ed027dc
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.