Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add scott-fryxell/brayness --skill skill-writergit clone --depth 1 https://github.com/scott-fryxell/braynessWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/scott-fryxell/brayness/skill-writer)<a href="https://agentmods.dev/skills/scott-fryxell/brayness/skill-writer"><img src="https://agentmods.dev/badge/skills/scott-fryxell/brayness/skill-writer/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/scott-fryxell/brayness/skill-writer"><img src="https://agentmods.dev/badge/skills/scott-fryxell/brayness/skill-writer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00083 | $0.01013 |
| Opus 5 | $0.00042 | $0.00507 |
| Sonnet 5 | $0.00017 | $0.00203 |
| Haiku 4.5 | $0.00008 | $0.00101 |
Grade A, and why
skill-writer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 104 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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
- Resolve target skill path and intended operation (
create,update,synthesize,iterate). - Read
references/mode-selection.mdand select the required path(s). - Classify the skill (
workflow-process,integration-documentation,security-review,skill-authoring,generic). - 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.
- Collect and score relevant sources with provenance.
- Apply trust and safety rules when ingesting external content.
- Produce source-backed decisions and coverage/gap status.
- Load one or more profiles from
references/examples/*.mdwhen the skill is hybrid. - Enforce baseline source pack for skill-authoring workflows.
- Enforce depth gates before moving to authoring.
What ships with it
18 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- EVAL.md 3.1 KB
- references/authoring-path.md 1.9 KB
- references/claude-code-extensions.md 3.7 KB
- references/description-optimization.md 908 B
- references/design-principles.md 6.8 KB
- references/evaluation-path.md 2.1 KB
- references/examples/documentation-skill.md 2.8 KB
- references/examples/security-review-skill.md 2.5 KB
- references/examples/workflow-process-skill.md 2.4 KB
- references/iteration-path.md 1021 B
- references/mode-selection.md 2.7 KB
- references/output-patterns.md 2.5 KB
- references/registration-validation.md 1.6 KB
- references/skill-patterns.md 7.6 KB
- references/synthesis-path.md 4.0 KB
- references/workflow-patterns.md 2.9 KB
- scripts/quick_validate.py 16 KB runs code
- SOURCES.md 2.9 KB
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 12d ago First seen · 104 lines · 83 tokens per session scan A 66ea94bed313
skill-writer is a skill published in the GitHub repository scott-fryxell/brayness (121 stars, last pushed 4d ago), licensed MIT. It adds 83 tokens to every session and 1,013 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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