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 agentmods add skills/agi-comming/functional-skill-creator/fskill-creatornpx skills add AGI-comming/functional-skill-creator --skill fskill-creatorgit clone --depth 1 https://github.com/AGI-comming/functional-skill-creatorWrote 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/agi-comming/functional-skill-creator/fskill-creator)<a href="https://agentmods.dev/skills/agi-comming/functional-skill-creator/fskill-creator"><img src="https://agentmods.dev/badge/skills/agi-comming/functional-skill-creator/fskill-creator.svg" alt="Measured on agentmods" 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 | $0.00033 | $0.01694 |
| Opus 5 | $0.00016 | $0.00847 |
| Sonnet 5 | $0.00007 | $0.00339 |
| Haiku 4.5 | $0.00003 | $0.00169 |
Grade A, and why
fskill-creator 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 4d 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 — 82 lines — stays where its author put it; the contents beside it link to each section on GitHub.
fskill-creator
Goal
Unify the create and migrate lanes to produce a self-contained, reviewable, testable functional agent skill directory. The main skill handles routing, blueprint normalization, shared artifact generation, runtime capability provisioning, file writing, and validation; sub-skills only handle pre-analysis for their respective input forms.
Use this skill when the user wants to "generate a functional skill", "create a functional skill", "add functions to an existing functional skill", or "migrate an existing legacy skill directory into a functional skill".
Principles
- The main
SKILL.mdonly orchestrates the shared create / migrate / enhance / validate workflow. - Create and migrate are two pre-lanes; they must first converge into a unified
skill_blueprint. - Function-specific behavior lives in
functions/*.md; create / migrate specific pre-behavior lives insub-skills/*/functions/*.md. - Shared vocabulary, policies, and schemas live in
references/*.md. - Deterministic parsing, formatting, validation, and mechanical transforms live in
scripts/. - Report, unit test, viewer, and testcase capabilities are maintained only once in the main skill, and vendored into the target skill by
add_runtime_capabilities. - Preserve user-provided domain constraints; the migrate lane must also preserve legacy behavior evidence.
- When the user has not approved direct modification, generated files should be treated as proposals.
Sub-Skills
| Sub-skill | When | Responsibility | Output |
|---|---|---|---|
sub-skills/create |
User provides a new skill brief or wants to enhance an existing functional skill | Normalize requirements, target path, inputs/outputs, constraints, and viewer choices | create_context |
sub-skills/migrate |
User provides a legacy skill directory, monolithic skill content, or a migration request | Load the legacy skill package, identify behaviors that must be preserved, propose function boundaries and evidence | migration_context |
What ships with it
36 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.
- functions/add_runtime_capabilities.md 2.4 KB
- functions/assemble_skill_files.md 2.2 KB
- functions/design_skill_structure.md 2.7 KB
- functions/draft_skill_artifacts.md 2.4 KB
- functions/normalize_skill_blueprint.md 2.8 KB
- functions/resolve_task_mode.md 1.9 KB
- functions/validate_skill.md 2.5 KB
- logs/runs/.gitkeep 1 B
- references/script-rules.md 1.3 KB
- references/shared-glossary.md 1.9 KB
- scripts/.gitkeep 1 B
- scripts/init_skill.mjs 25 KB runs code
- scripts/init_skill.test.mjs 3.7 KB runs code
- scripts/lint_skill.mjs 2.1 KB runs code
- scripts/test_cases.mjs 5.4 KB runs code
- scripts/test_cases.test.mjs 1.4 KB runs code
- sub-skills/create/functions/collect_create_brief.md 1.9 KB
- sub-skills/create/references/.gitkeep 1 B
- sub-skills/create/scripts/.gitkeep 1 B
- sub-skills/create/SKILL.md 1.2 KB
- sub-skills/create/testcases/unit/.gitkeep 1 B
- sub-skills/migrate/functions/extract_shared_references.md 1.5 KB
- sub-skills/migrate/functions/load_legacy_skill.md 2.2 KB
- sub-skills/migrate/functions/map_existing_behavior.md 1.6 KB
- sub-skills/migrate/functions/propose_function_split.md 2.8 KB
- sub-skills/migrate/logs/runs/.gitkeep 1 B
- sub-skills/migrate/references/script-rules.md 1.3 KB
- sub-skills/migrate/references/shared-glossary.md 1.6 KB
- sub-skills/migrate/scripts/.gitkeep 1 B
- sub-skills/migrate/scripts/lint_skill.mjs 2.1 KB runs code
- sub-skills/migrate/scripts/migrate_proposal.mjs 8.6 KB runs code
- sub-skills/migrate/scripts/migrate_proposal.test.mjs 4.0 KB runs code
- sub-skills/migrate/scripts/test_cases.mjs 4.5 KB runs code
- sub-skills/migrate/SKILL.md 4.3 KB
- sub-skills/migrate/testcases/unit/propose_function_split.basic.case.json 2.0 KB
- testcases/unit/design_skill_structure.basic.case.json 2.0 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.
- 4d ago First seen · 82 lines · 33 tokens per session scan A 8fa5445708eb
fskill-creator is a skill published in the GitHub repository AGI-comming/functional-skill-creator (360 stars, last pushed 2mo ago), licensed MIT. It adds 33 tokens to every session and 1,694 once invoked, about $0.0002 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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