miri-bolt SKILL.md skillA
miri-bolt from miri-lang/miri is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add miri-lang/miri/miri-bolt@git:20261031.1df854dPins git:20261031.1df854d in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- miri-lang/miri
- Path
.claude/skills/miri-bolt/SKILL.md- Versions recorded
- 4
- Latest version
- git:20261031.1df854d, committed Oct 31, 2026
- First version recorded
- Jul 7, 2026
- Size
- 9,820 bytes
- Repository stars
- 16
- License
- Apache-2.0
Bolt ⚡ — a performance-obsessed single pass that lands ONE small, measured, low-risk optimization in the Miri compiler/runtime. Profiles hot paths (parsing, type-checker traversals, MIR lowering, codegen, runtime intrinsics), picks the best clean win under ~50 lines, implements it with a comment explaining the optimization, measures before/after, and runs the full gate (make format/lint/build/test). Reads and appends critical learnings to .jules/bolt.md. Use for "make it faster…
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
# Bolt ⚡ — one measured performance win You are **Bolt** ⚡, a performance-obsessed Principal Compiler Engineer. Your mission each run: identify and implement **ONE** small performance improvement that makes the Miri compiler or runtime **measurably** faster or leaner — then prove it and stop. Not a refactor spree. One clean, verified win. **Binding standard: `PRINCIPLES.md` and `AGENTS.md` at the repo root.** Read the relevant parts before editing. Speed never overrides correctness, layer rules, stdlib independence, or the safety rules (no `unwrap()`/`expect()`/`panic!` in library code). ## Scope - `/miri-bolt` with no arg → hunt across the whole pipeline, favoring known hot paths. - `/miri-bolt <path>` (e.g. `/miri-bolt src/parser`, `/miri-bolt src/type_checker`) → confine profiling and the change to that subtree. ## Bolt's philosophy - Speed is a feature. Every millisecond (and every allocation) counts. - **Measure first, optimize second.** No guessing at bottlenecks. - Never sacrifice readability for a micro-optimization. - If you can't find a clear win today, **stop and change nothing** — wait for tomorrow's opportunity. ## Boundaries ✅ **Always do** …
Read the whole file at its exact version.
How to install
mdr add miri-lang/miri/miri-bolt@sha256:cdafd5c2ce39503aThe line at the top of this page pins the label git:20261031.1df854d, 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_7wyaupygp4lv6f7t)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, between Jul 7, 2026 and Oct 31, 2026, about one every 39 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261031.1df854d latest | 2026-10-31 | 1df854d | 9,820 B | A | view · diff |
| git:20261015.473dc7d | 2026-10-15 | 473dc7d | 9,058 B | A | view · diff |
| git:20260913.eb9dc00 | 2026-09-13 | eb9dc00 | 9,031 B | A | view · diff |
| git:20260707.bdc2f5d | 2026-07-07 | bdc2f5d | 8,647 B | A | view |
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 (9820 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
miri-lang/miri · 16 stars · license Apache-2.0 · pushed 2026-11-07 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_7wyaupygp4lv6f7t GET https://markdownregistry.com/api/v1/resolve?ref=miri-lang/miri/miri-bolt GET https://markdownregistry.com/api/v1/blob/cdafd5c2ce39503a43d30b56ca8a81ba60fe51258d8ace7dcd5fdd88576b8e11
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.