drill-spec

drill-spec is a skill for Claude Code, Codex from Unique-Divine/jiyuu. It costs 81 tokens per session (549 once invoked), scanned A, original, MIT.

A structured questioning guide for examining a plan, specification, or design until its decisions and unclear points are shared and understood.

In plain words
What is it for?
Use it to stress-test plans, ask focused design questions, explore the codebase for answers, and update a spec with implementation decisions and remaining tasks.
Why use it?
It helps expose ambiguities, risks, edge cases, and unresolved choices before implementation. It also keeps the agreed decisions recorded in the relevant document or notes.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to stress-test plans, ask focused design questions, explore the codebase for answers, and update a spec with implementation decisions and remaining tasks.

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Install with agentmods
npx agentmods add skills/unique-divine/jiyuu/drill-spec
Install

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.

Any agent
npx skills add Unique-Divine/jiyuu --skill drill-spec
Clone the repo
git clone --depth 1 https://github.com/Unique-Divine/jiyuu

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for drill-spec

README.md
[![agentmods](https://agentmods.dev/badge/skills/unique-divine/jiyuu/drill-spec.svg)](https://agentmods.dev/skills/unique-divine/jiyuu/drill-spec)
Your own site
<a href="https://agentmods.dev/skills/unique-divine/jiyuu/drill-spec"><img src="https://agentmods.dev/badge/skills/unique-divine/jiyuu/drill-spec.svg" alt="Measured on agentmods" height="20"></a>
Per session 81 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 549 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00081 $0.00549
Opus 5 $0.00041 $0.00275
Sonnet 5 $0.00016 $0.00110
Haiku 4.5 $0.00008 $0.00055

Measured 8d ago against content hash 7a341436ac72, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

drill-spec 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 8d 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.

ai-skills/drill-spec/SKILL.md · 50 lines

What it actually says

Interview me about a plan, spec, or design until we reach shared understanding. Ask direct questions that resolve concrete decisions, ambiguities, risks, and edge cases. For each question, provide your recommended answer.

  1. Ask up to five questions per turn. Ask fewer when a single answer blocks the next useful question. Ask in the chat, not with the question tool.

  2. If a question can be answered by exploring the codebase, explore the codebase instead.

  3. Record decisions as the discussion progresses. If the user is working from an existing spec, plan, issue, or design document, write resolved answers back into that document iteratively. If there is no obvious document, create or propose a short notes/spec file.

  4. When recording implementation decisions, add or update one or more top-level ## Impl sections. Use concise logical flows where they make the design easier to execute:

    input or trigger
      -> state read/write
      -> validation
      -> result
    
  5. When recording an answer, capture the decision, rationale, relevant codebase or operational context, and important caveats. Use open checkbox sub-bullets only for unresolved work, decisions, or tests. A resolved decision may remain as a completed decision task or become settled prose, following agent skill md-tasks.

  6. Continue drilling while material design ambiguity remains for the implementation sequence being handed off. Answered questions alone do not make that scope ready for implementation. When the design stabilizes:

    • Follow agent skill md-tasks for a final normalization pass.
    • Preserve settled decisions and rationale while deriving separate open implementation, validation, rollout, or deferred tasks.
    • Check that no actionable consequence remains hidden in narrative prose.
    • If the artifact is an epic, follow agent skill epics for placement, structure, and handoff synthesis, including multiple top-level ## Impl sections when they help separate implementation sequences.
    • Explicitly defer non-blocking questions so one stable ## Impl sequence can proceed without implying that every later sequence is fully specified.
Changes

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.

  1. 8d ago First seen · 50 lines · 81 tokens per session scan A 7a341436ac72

Subscribe to this mod's changes

drill-spec is a skill published in the GitHub repository Unique-Divine/jiyuu (6 stars, last pushed today), licensed MIT. It adds 81 tokens to every session and 549 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.