skill-writer
Create, synthesize, and iteratively improve agent skills following the Agent Skills specification.
Skill by scott-fryxell
Chalk Labs
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Install
Works with Claude Code, Claude apps, Codex, Cursor, Gemini CLI, GitHub Copilot, VS Code, OpenCode, Goose, Windsurf. Read the repository before you give any tool access to your data.
npx agentmarket install skill/scott-fryxell-skill-writer
Asks which of your tools to add it to (Claude Code, Codex, Cursor, VS Code, Windsurf, Gemini CLI, Claude Desktop) and shows the change first. See https://agentmart.dev/cli.
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About
Use cases: writing, agent-building
Reviews
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Permissions
What this skill can do and what it asks for, from its SKILL.md. Checked Oct 25, 2026.
- Tools
- No tools found
- Secrets
- None asked for
- Install scripts
- None found
- Runs as
- Python package
Network hosts it talks to 1
codeload.github.com· found in install command
Files it touches
~/.claude/skills/skill-writer
What's inside
- Skill name
skill-writer- Description
- Create, synthesize, and iteratively improve agent skills following the Agent Skills specification. Use when asked to "create a skill", "write a skill", "synthesize sources into a skill", "improve a skill from positive/negative examples", "update a skill", or "maintain skill docs and registration". Handles source capture, depth gates, authoring, registration, and validation.
- License
- MIT
- Instructions
- 100 lines in SKILL.md · view on GitHub
Before installing
- Ships executable scripts
Files (19)
- EVAL.md
- SKILL.md
- SOURCES.md
- authoring-path.md · references/
- claude-code-extensions.md · references/
- description-optimization.md · references/
- design-principles.md · references/
- evaluation-path.md · references/
- documentation-skill.md · references/examples/
- security-review-skill.md · references/examples/
- workflow-process-skill.md · references/examples/
- iteration-path.md · references/
- mode-selection.md · references/
- output-patterns.md · references/
- registration-validation.md · references/
- skill-patterns.md · references/
- synthesis-path.md · references/
- workflow-patterns.md · references/
- quick_validate.py · scripts/
SKILL.md (first lines)
# Skill Writer Use this as the single canonical workflow for skill creation and improvement. Primary success condition: maximize high-value input coverage before authoring so the resulting skill has minimal blind spots. Load only the path(s) required for the task: | Task | Read | |------|------| | Set skill class and required dimensions | `references/mode-selection.md` | | Apply writing constraints for depth vs concision | `references/design-principles.md` | | Select structure pattern for this skill | `references/skill-patterns.md` | | Select workflow orchestration pattern for process-heavy skills | `references/workflow-patterns.md` | | Select output format pattern for deterministic quality | `references/output-patterns.md` | | Choose workflow path and required outputs | `references/mode-selection.md` | | Load representative synthesis examples by skill type | `references/examples/*.md` | | Synthesize external/local sources with depth gates | `references/synthesis-path.md` | | Author or update SKILL.md and supporting files | `references/authoring-path.md` | | Optimize skill description and trigger precision | `references/description-optimization.md` | | Iterate using positive/negative/fix examples | `references/iteration-path.md` | | Evaluate behavior and compare baseline vs with-skill (opt-in quantitative) | `references/evaluation-path.md` | | Register and validate skill changes | `references/registration-validation.md` | ## Step 1: Resolve target and path 1. Resolve target skill path and intended operation (`create`, `update`, `synthesize`, `iterate`). 2. Read `references/mode-selection.md` and select the required path(s). 3. Classify the skill (`workflow-process`, `integration-documentation`, `security-review`, `skill-authoring`, `generic`). 4. Ask one direct question if class or depth requirements are ambiguous; otherwise state explicit assumptions. ## Step 2: Run synthesis when needed Read `references/synthesis-path.md`. 1. Collect and score relevant sources with provenance. 2. Apply trust and safety rules when ingesting external content. 3. Produce source-backed decisions and coverage/gap status. 4. Load one or more profiles from `references/examples/*.md` when the skill is hybrid. 5. Enforce baseline source pack for skill-authoring workflows. 6. Enforce depth gates before moving to authoring. ## Step 3: Run iteration first when improving from outcomes/examples Read `references/iteration-path.md` first when selected path includes `iteration` (for example operation `iterate`). 1. Capture and anonymize examples with provenance. 2. Re-evaluate skill behavior against working and holdout slices. 3. Propose improvements from positive/negative/fix evidence. 4. Carry concrete behavior deltas into authoring. Skip this step when selected path does not include `iteration`. ## Step 4: Author or update skill artifacts Read `references/authoring-path.md`. 1. Write or update `SKILL.md` in imperative voice with trigger-rich description. 2. Create focused reference files and scripts only when justified. 3. Follow `references/skill-patterns.md`, `references/workflow-patterns.md`, and `references/output-patterns.md` for structure and output determinism. 4. For authoring/generator skills, include transformed examples in references: - happy-path - secure/robust variant - anti-pattern + corrected version ## Step 5: Optimize description quality Read `references/description-optimization.md`. 1. Validate should-trigger and should-not-trigger query sets. 2. Reduce false positives and false negatives with targeted description edits. 3. Keep trigger language generic across Codex and Claude. ## Step 6: Evaluate outcomes Read `references/evaluation-path.md`. 1. Run a lightweight qualitative check by default (recommended). 2. For integration/documentation and skill-authoring skills, include the concise depth rubric from `references/evaluation-path.md`. 3. Run deeper eval playbook and quantitative baseline-vs-with-skill only when requested or risk warrants it. 4. Record outcomes and unresolved risks. ## Step 7: Register and validate Read `references/registration-validation.md`. 1. Apply repository registration steps. 2. Run quick validation with strict depth gates. 3. Reject shallow outputs that fail depth gates or required artifact checks. ## Output format Return: 1. `Summary` 2. `Changes Made` 3. `Validation Results` 4. `Open Gaps`
From scott-fryxell/brayness, MIT.
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Signals
- Stars
- 125
- Forks
- 15
- Open issues
- 0
- Last commit (this folder)
- Sep 28, 2026 (1 month ago)
From GitHub (fetched Oct 24, 2026).
Details
- License
- MIT
- Repository
- github.com/scott-fryxell/brayness
- First seen
- Oct 24, 2026
- Last checked
- Oct 24, 2026
- Source
- GitHubgithub-graphql
Same skill elsewhere
Copies of this SKILL.md published by others; search shows only one of them.
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- 0.786score
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Sync changes from dev brayness/ to the published git mirror at `skills/brayness-sync/published/`.
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Create video compositions, animations, title cards, overlays, captions, voiceovers, audio-reactive visuals, and scene transitions in HyperFrames HTML.
SkillAFreshness: A★ 125Claude Code +9 - 0.786score
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SkillAFreshness: A★ 125Claude Code +9 - 0.786score
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Helps research a company and prepare for its hiring process -- company research, why-this-company/role fit exploration, behavioral (STAR) prep, technical/DSA…
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Store and retrieve durable learnings about how brayness actually works - success patterns, failure modes, corrections, and next-time hints.
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skill-writer. Agent Mart. https://agentmart.dev/skills/scott-fryxell-skill-writer (last updated 2026-10-24)