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/sd0xdev/sd0x-harness/feature-devnpx skills add sd0xdev/sd0x-harness --skill feature-devgit clone --depth 1 https://github.com/sd0xdev/sd0x-harnessWhat 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 | $0.00050 | $0.01893 |
| Opus 5 | $0.00025 | $0.00946 |
| Sonnet 5 | $0.00010 | $0.00379 |
| Haiku 4.5 | $0.00005 | $0.00189 |
Grade A, and why
feature-dev 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 2d 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 — 196 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Feature Development Skill
Trigger
- Keywords: develop feature, implement, write code, verify, precommit, refactor, simplify
When NOT to Use
- Just want to understand code (use Explore)
- Review code only (use codex-code-review)
- Review documents only (use doc-review)
- Pure test-only tasks without feature changes (use
/codex-test-reviewdirectly)
Prohibited Actions
❌ git add | git commit | git push — per @rules/git-workflow.md
This skill implements features but does not commit. /precommit is a quality gate only. To commit, the user must invoke /smart-commit --execute separately.
budget:token_budget200000</budget:token_budget>
Workflow
Requirements → Design → Implement → Test + Review → Precommit Gate → Doc Sync
│ │ │ │ │
▼ ▼ ▼ ▼ ▼
/codex- /codex- /verify /precommit /update-docs
architect implement /codex-test-review (or /precommit) /create-request --update
/codex-review-fast
Load the intent first: identify the feature this work belongs to (from the task, the
spec/requirements being followed, or the paths being changed) and read
docs/features/<key>/intent-<key>.md if it exists — it overrides your default approach. Work
that contradicts one of its INV-* invariants or Non-goals stops and asks the user (cite the
line; amending intent is their re-decision). No identifiable feature → nothing to load; proceed.
Design before code: for a non-trivial change, briefly consider who owns each responsibility,
the simplest shape that fits the existing code, and why — and say what you chose when the choice
is non-obvious. Principles (clear names, small cohesive functions, dependency direction,
composition where it reduces coupling) are questions, not quotas: never add an abstraction to
demonstrate design. /codex-architect is for genuinely hard trade-offs (cross-module boundaries,
new public APIs, durable abstractions), not every feature.
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.
- 2d ago First seen · 196 lines · 50 tokens per session scan A 35ec5d515afe
feature-dev is a skill published in the GitHub repository sd0xdev/sd0x-harness (188 stars, last pushed 2d ago), licensed MIT. It adds 50 tokens to every session and 1,893 once invoked, about $0.0003 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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