Update V8 Version
openinterpreter/openinterpreter
Bumps the pinned v8 and rusty_v8 versions in Codex, validates the release-candidate path with the v8-canary check, and traces failures to upstream build changes.
Canonical rules for writing and reviewing Rust code in Shift's crates.
Apache-2.0Auto-check passed
Install Rust
$ npx skills add shift-editor/shift --skill rust -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install shift-editor/shift rust --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/shift-editor/shift.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.codex/skills/rust .claude/skills/rust && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "rust" agent skill from https://github.com/shift-editor/shift/tree/main/.codex/skills/rust into .claude/skills/rust/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "rust", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/shift-editor/shift/tree/main/.codex/skills/rustType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add shift-editor/shift --skill rust -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install shift-editor/shift rust --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/shift-editor/shift.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.codex/skills/rust .agents/skills/rust && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "rust" agent skill from https://github.com/shift-editor/shift/tree/main/.codex/skills/rust into .agents/skills/rust/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "rust", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add shift-editor/shift --skill rust -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install shift-editor/shift rust --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/shift-editor/shift.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.codex/skills/rust .cursor/skills/rust && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "rust" agent skill from https://github.com/shift-editor/shift/tree/main/.codex/skills/rust into .cursor/skills/rust/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "rust", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/shift-editor/shift.git --path .codex/skills/rust--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add shift-editor/shift --skill rust -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install shift-editor/shift rust --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/shift-editor/shift.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.codex/skills/rust .gemini/skills/rust && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "rust" agent skill from https://github.com/shift-editor/shift/tree/main/.codex/skills/rust into .gemini/skills/rust/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "rust", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install shift-editor/shift rustInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add shift-editor/shift --skill rust -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/shift-editor/shift.git skills-src && mkdir -p .github/skills && cp -r skills-src/.codex/skills/rust .github/skills/rust && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "rust" agent skill from https://github.com/shift-editor/shift/tree/main/.codex/skills/rust into .github/skills/rust/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "rust", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add shift-editor/shift --skill rust -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install shift-editor/shift rust --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/shift-editor/shift.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.codex/skills/rust .opencode/skills/rust && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "rust" agent skill from https://github.com/shift-editor/shift/tree/main/.codex/skills/rust into .opencode/skills/rust/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "rust", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
rust- GitHub stars
- 343
- Token cost
- ~1.5k tokens
- SKILL.md length
- 658 words
- Files
- 1
- Skills in repo
- 14
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Canonical rules for writing and reviewing Rust code in Shift's crates.
- Change .rs code
- SKILL.md covers The rule, Error helpers that already exist, Adding a helper and Lookups and ids, plus 2 more sections
- Calls cargo
- Especially error handling (okor
What it does
Rust is an agent skill from shift-editor/shift. Canonical rules for writing and reviewing Rust code in Shift's crates. Use whenever you add or change .rs code, especially error handling (okor, okorelse, maperr, ?, CoreError, StoreError, SlugError, BridgeError), entity lookups by id, checked arithmetic and integer conversions, or helpers that several call sites repeat. Load rustdoc as well when the change adds or edits doc comments.
Its SKILL.md is about 1.5k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It works with Rust. The repository describes itself as: A cross-platform font editor built in Rust and TypeScript. The licence is Apache-2.0.
When your agent uses it
- Change .rs code
- Especially error handling (okor
- Entity lookups by id
- Checked arithmetic and integer conversions
Example prompts
- “/rust”
What it can do on your machine
Read from SKILL.md and the folder at commit e7dacfa. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
cargo
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Rust loads about 1.5k tokens when it runs. Until then it costs about 104 tokens; SKILL.md has 658 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from shift-editor/shift at commit e7dacfa, republished under its Apache-2.0 licence (© shift-editor). 658 words, ~1,547 tokens.
Download SKILL.mdSave it as
.claude/skills/rust/SKILL.md (or your agent's skills folder).- name
- rust
- description
- Canonical rules for writing and reviewing Rust code in Shift's crates. Use whenever you add or change `.rs` code, especially error handling (`ok_or`, `ok_or_else`, `map_err`, `?`, `CoreError`, `StoreError`, `SlugError`, `BridgeError`), entity lookups by id, checked arithmetic and integer conversions, or helpers that several call sites repeat. Load `rustdoc` as well when the change adds or edits doc comments.
/rust — How Rust is written in Shift
Shift's crates had the same failure built by hand at hundreds of sites: .ok_or_else(|| CoreError::GlyphNotFound(glyph_id.clone()))?, .map_err(|_| SlugError::LengthOverflow)?, StoreError::MissingEntity { kind, id } struct literals. Every copy drifted a little: different kind strings, eager ok_or cloning ids on the success path, lookups cloning an id just to pass it by value. The rules below keep a failure defined once and named at the call site.
The rule
A failure that recurs for the same reason is constructed in exactly one place. Call sites say what they need (require_glyph, or_overflow, or_missing), not how to build the error.
ok_or_else with a site-specific error is fine. A message that only makes sense at one site, such as InvalidLibValue("missing value") in a parser, belongs inline. The second time the same error appears for the same reason, extract it.
Error helpers that already exist
Use these before writing an error by hand:
| Failure | Helper | Crate |
|---|---|---|
Entity missing from a Font | font.require_glyph(&id)?, require_layer, require_layer_mut, require_layer_owner, require_source, require_axis | shift-font (ir/font.rs) |
| Entity missing from any other lookup | lookup.require(&id)? (Require + EntityRef; the id's type picks the *NotFound variant) | shift-font (error.rs) |
| Contour, point, or anchor missing from a layer | layer.require_contour_mut(id)?, require_point_mut, require_point_contour, require_anchor_mut | shift-font (layer_edit.rs) |
| Length or offset overflow | a.checked_add(b).or_overflow()?, u32::try_from(n).or_overflow()?, length::to_u32, length::ensure_total, length::within | shift-slug (length.rs) |
| Row missing from the store | lookup.or_missing("glyph", &id)?, order_index(conn, table, kind, &id)? | shift-store (error.rs, change_set.rs) |
| Retained-source index out of range | identity.glyph_id(index)?, glyph_index, axis_id, source_id | shift-bridge (SourceIdentity) |
? converts between crate errors through the existing From impls (SlugError into AuthoredSlugError, BridgeError and the backends error; CoreError into StoreError). Do not name another crate's error variant at a call site, as in shift_slug::SlugError::LengthOverflow; call that crate's helper and let ? convert.
Adding a helper
When an error pattern repeats and no helper fits, add one next to the data it describes:
- Lookups on an owner (
Font,GlyphLayer,SourceIdentity): add arequire_*method beside theOptionlookup. It takes the id by reference and returnsResult<&T, _>. - One error for many value types (all ids, all checked operations): add an extension trait on
Option<T>orResult<T, E>whose method names the failure (require,or_overflow,or_missing), plus one impl per input type. A macro likeentity_ref!keeps one line per variant. - A repeated query or computation that ends in the error (the same SQL with
.optional()?): extract the whole operation as one function, not just its error. - Only one crate needs it: keep it
pub(crate). Export it only when another crate would otherwise build the same error.
Every new helper gets Rustdoc with an # Errors section (see rustdoc) and a unit test of the failure it produces.
Show full SKILL.md (229 more words)Show less
Lookups and ids
- Lookups take ids by reference:
fn glyph(&self, id: &GlyphId). Ids areStringnewtypes; a by-value parameter forces every caller that keeps its id to clone it. Take an id by value only when the function stores or returns it. - Never pass
&id.clone(); borrow the id you have. - Never clone an id only to build an error that is probably not returned. Use
ok_or_elseor the helpers above, which format the id only on failure.ok_or(CoreError::X(id.clone()))clones on every call, including successful ones. Optionlookups (font.glyph(id)) are for "absent is a normal answer". Userequire_*when absence is an error for this caller.
Arithmetic and conversions
- Lengths, offsets, and counts that reach packed buffers use checked arithmetic with
.or_overflow()?. Keep thechecked_add/checked_mulvisible at the call site. - Integer narrowing uses
try_fromwith.or_overflow()?orlength::to_u32. Never useasfor a narrowing conversion that can lose data. - Bit-packed fields with a limit below their integer type go through
length::within(value, MASK)?.
Review checklist
- No
CoreError::*NotFound,SlugError::LengthOverflow, orStoreError::MissingEntitybuilt inline where a helper above applies. - No other crate's error variant named at a call site.
- No id cloned on a lookup's success path just for its error.
- Any error built at two or more sites for the same reason has one helper, with Rustdoc and a test.
-
cargo fmt,cargo clippyfor the affected crates, and their tests pass.
© shift-editor, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in .codex/skills/rust of shift-editor/shift.
Open the folder on GitHubat commit e7dacfa
Compare with similar skills
Rust next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Rust this skillshift-editor/shift | 343 | — | ~1.5k | Automated safety check: Pass | Apache-2.0 | |
| Update V8 Versionopeninterpreter/openinterpreter | 69k | 2 repos | ~845 | Automated safety check: Pass | Apache-2.0 | |
| Firecrawl Page Scrape Integrationfirecrawl/firecrawl | 189k | 1 repos | ~944 | Automated safety check: Pass | ISC | |
| Migrate Core Code to Submodulestinyhumansai/openhuman | 41k | — | ~2.6k | Automated safety check: Pass | GPL-3.0 | |
| Rust TDD Workflowrtk-ai/rtk | 83k | — | ~753 | Automated safety check: Notes | Apache-2.0 | |
| Rust Best Practicesfarm-fe/farm | 5.6k | 3 repos | ~1.1k | Automated safety check: Pass | MIT |
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Related
Works with
Questions about Rust
What does Rust do?
Canonical rules for writing and reviewing Rust code in Shift's crates. Rust is an agent skill from shift-editor/shift. Canonical rules for writing and reviewing Rust code in Shift's crates.
When should I use Rust?
Rust fits situations like: change .rs code; especially error handling (okor; entity lookups by id; checked arithmetic and integer conversions.
How do I install Rust in Claude Code?
Run `npx skills add shift-editor/shift --skill rust -a claude-code`. Or copy the skill folder (.codex/skills/rust in shift-editor/shift) into .claude/skills/rust in your project. Claude Code loads it when a task matches its description.
How do I install Rust in Codex?
Run `npx skills add shift-editor/shift --skill rust -a codex`. Or copy the skill folder (.codex/skills/rust in shift-editor/shift) into .agents/skills/rust in your project. Codex loads it when a task matches its description.
Can I use Rust in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add shift-editor/shift --skill rust -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/rust, .gemini/skills/rust, .github/skills/rust and .opencode/skills/rust in your project.
What does Rust need to run?
Going by SKILL.md and its folder, Rust needs the command-line tools its instructions call (cargo).
Does Rust access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Rust safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Rust use?
Rust is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Rust use?
About 1.5k tokens (SKILL.md is roughly 6.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Rust?
Skills that share tags, products or a category with Rust: Update V8 Version (openinterpreter/openinterpreter, 69k stars), Firecrawl Page Scrape Integration (firecrawl/firecrawl, 189k stars), Migrate Core Code to Submodules (tinyhumansai/openhuman, 41k stars) and Rust TDD Workflow (rtk-ai/rtk, 83k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Rust?
shift-editor (a GitHub organization) maintains it in shift-editor/shift, which has 343 GitHub stars. The repository holds 14 skills in this directory. The repository was last updated on October 6, 2026.
Source: shift-editor/shift on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.