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 pax-k/build-right --skill build-right-feature-planninggit clone --depth 1 https://github.com/pax-k/build-rightWrote 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/pax-k/build-right/build-right-feature-planning)<a href="https://agentmods.dev/skills/pax-k/build-right/build-right-feature-planning"><img src="https://agentmods.dev/badge/skills/pax-k/build-right/build-right-feature-planning/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/pax-k/build-right/build-right-feature-planning"><img src="https://agentmods.dev/badge/skills/pax-k/build-right/build-right-feature-planning.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 | $0.00080 | $0.02515 |
| Opus 5 | $0.00040 | $0.01257 |
| Sonnet 5 | $0.00016 | $0.00503 |
| Haiku 4.5 | $0.00008 | $0.00251 |
Grade A, and why
build-right-feature-planning 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 11d 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 — 251 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Build Right Feature Planning
Use this skill after preflight has created product truth, operating rules, and a task surface, and before execution starts implementation.
Core rule:
Explore the feature.
Clarify only what changes the plan.
Research or delegate when evidence is needed.
Update backlog, sprint, decisions, evidence, conflicts, and task files.
Stop before implementation.
Required Reading
- Always read
references/workflow.mdbefore acting. - Read
references/gates.mdbefore asking founder questions, running research, changing sprint/backlog state, or declaring a task ready. - Read
references/planning-contract.mdbefore creating or updating planning artifacts, sprint trackers, backlog rows, or task files. - Read
references/decomposition.mdbefore splitting a feature, planning a wide refactor, or deciding whether discovery is too foggy for a task graph. - Read
references/research-and-delegation.mdonly when web research, public-evidence claims, technical feasibility review, conflict review, or subagent delegation triggers apply. - Read
../build-right-engineering-principles/references/principles.mdwhen splitting features into implementation tasks, selecting technologies, planning architecture, storage, integration, deployment, service-boundary, or package changes, designing contracts, changing provider boundaries, or planning security, reliability, observability, or test strategy. - Use
assets/templates/tasks/feature-task.mdwhen creating a new execution task. - Use
assets/templates/tasks/post-release-backlog.mdwhen creating a missing backlog tracker. - Use bundled
scripts/feature-planning-check.tsfor deterministic planning surface, gate, destination, and task-candidate signals. Treat script output as input to judgment, not authority. - Use bundled
scripts/ensure-openspec.tsbefore planning. Managed setup is internal and idempotent; never route provider setup or commands to the user. - Use bundled
scripts/openspec-change-check.tsafter Build Right planning gates clear. It is the only feature-planning entrypoint for managed change creation, dependency-ordered artifact state, strict validation, and thin task binding. - Invoke every managed helper used as evidence as its own direct Bun shell
command. Do not chain it with
&&,;, pipes, redirects, or trailing commands; the native evidence gate binds success to that isolated invocation.
What ships with it
26 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.
- agents/openai.yaml 290 B
- assets/templates/subagents/feature-conflict-scan.md 591 B
- assets/templates/subagents/feature-feasibility-review.md 730 B
- assets/templates/tasks/feature-task.md 1.7 KB
- assets/templates/tasks/post-release-backlog.md 395 B
- references/decomposition.md 2.8 KB
- references/gates.md 2.9 KB
- references/planning-contract.md 4.4 KB
- references/research-and-delegation.md 1.2 KB
- references/workflow.md 5.7 KB
- scripts/ensure-openspec.ts 210 B runs code
- scripts/feature-planning-check.ts 17 KB runs code
- scripts/lib/openspec/adapter.ts 12 KB runs code
- scripts/lib/openspec/atomic-install.ts 2.9 KB runs code
- scripts/lib/openspec/contracts.ts 1.5 KB runs code
- scripts/lib/openspec/ensure-openspec.ts 1.6 KB runs code
- scripts/lib/openspec/execution-progress.ts 23 KB runs code
- scripts/lib/openspec/feature-planning.ts 23 KB runs code
- scripts/lib/openspec/managed-runtime.ts 2.0 KB runs code
- scripts/lib/openspec/orchestrator.ts 21 KB runs code
- scripts/lib/openspec/process-runner.ts 3.8 KB runs code
- scripts/lib/openspec/provider-contracts.ts 1.9 KB runs code
- scripts/lib/openspec/safe-setup.ts 13 KB runs code
- scripts/lib/openspec/source-manifest.json 431 B
- scripts/lib/openspec/zero-mention.ts 1.8 KB runs code
- scripts/openspec-change-check.ts 3.3 KB runs code
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.
- 11d ago First seen · 251 lines · 80 tokens per session scan A 69af6c695f60
build-right-feature-planning is a skill published in the GitHub repository pax-k/build-right (4 stars, last pushed 1mo ago), licensed MIT. It adds 80 tokens to every session and 2,515 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 2026-08-31.
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