agentic-journeys: Skill for Claude Code

.github/skills/grill-plan/SKILL.md

grill-plan is a skill for Claude Code, Codex from microsoft/agentic-journeys. It costs 121 tokens per session (654 once invoked), scanned A, original, MIT.

A guided interview for an issue or implementation plan that asks one question at a time about unresolved decisions and turns the answers into a decisions table and test list. Test-driven development (TDD) uses tests to define and verify the required behavior.

In plain words
What is it for?
Use it to clarify a plan, resolve its open decisions, and identify the tests needed for each acceptance criterion.
Why use it?
It prevents an agent from silently guessing about unclear requirements, edge cases, or failure handling before code is written.

Skill for Claude CodeCodex ✓ vendor

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

This is microsoft/agentic-journeys's own configuration. It tells Claude Code and Codex how to work on agentic-journeys itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything agentic-journeys configures →

About the project

microsoft/agentic-journeys is a collection of guided projects that shows how AI coding agents and skills can plan, build, and deploy applications on Azure. It is for developers building Azure applications and teams evaluating agent-assisted development workflows, including APIs, databases, frontends, and AI features. The catalogue entries supply skills, agents, and instructions used in these journeys.

microsoft/agentic-journeys · 6 stars · on GitHub

Reuse

Borrowing it

Nothing to install: this file belongs to microsoft/agentic-journeys. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/microsoft/agentic-journeys/main/.github/skills/grill-plan/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/microsoft/agentic-journeys

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.

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README.md
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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.

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Per session 121 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 654 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 $0.00121 $0.00654
Opus 5.5 $0.00048 $0.00262
Sonnet 5.5 $0.00024 $0.00131
Haiku 4.5 $0.00012 $0.00065

Measured 1mo ago against content hash 0cfa04bbc5f4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

grill-plan 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 1mo 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.

.github/skills/grill-plan/SKILL.md · 35 lines

How it starts

The opening of the file, as written. The whole thing — 35 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Grill the Plan

Find the decisions a plan leaves open before an agent fills them in silently. The output is a short list of decisions and the tests that will prove them.

Process

  1. Read first. Read the issue and every plan document and section it links to. Do not ask questions the plan already answers.
  2. Mandatory questions. If a linked plan has a Decision Points section, ask about every item in it. Each item lists a default. Offer that default as the first, recommended option.
  3. Your own questions. Then ask up to three more questions about gaps you found yourself. Good targets are boundary values, failure paths, what happens to related data, and how each acceptance criterion will be tested. Skip questions whose answer would not change the code or the tests.
  4. One at a time. Ask each question with the ask-user tool. Include two to four options, put the recommended default first, and add one sentence on why the choice matters. If the user says "use the defaults", accept every remaining default and stop asking.
  5. Summarize. When the questions are done, print:
    • A Decisions table with the columns Question, Decision, and Default or changed.
    • A Test list with one row per behavior (Behavior, Plan section, Proposed test name). The tdd-builder agent writes these tests in the red phase.
    • Anything still unresolved.
  6. Record it. When the user asks, post the summary as a comment on the issue with gh issue comment <number> --body-file <file>. Write the body to a temporary file first so the command works in PowerShell, Command Prompt, bash, and zsh. Delete the temporary file afterward.

Non-interactive sessions

If the ask-user tool isn't available, as in copilot -p or a cloud agent session, don't pretend an interview happened. Apply the recommended default for every question, mark each plan Decision Point row in the Decisions table as Default (not asked) and each question you raised yourself as Agent recommendation (not asked), and start the summary with one sentence saying that the interview ran non-interactively.

Read the full file on GitHub · 35 lines

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. 1mo ago First seen · 35 lines · 121 tokens per session scan A 0cfa04bbc5f4

Subscribe to this mod's changes

grill-plan is a skill published in the GitHub repository microsoft/agentic-journeys (6 stars, last pushed 12d ago), licensed MIT. It adds 121 tokens to every session and 654 once invoked, about $0.0005 per session on Opus 5.5. 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 2026-09-28.

Related

grill-plan compared with skills from other repositories

grill-plan next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
grill-planmicrosoft/agentic-journeysSkill612d agoMITA121Claude Code, Codex
imagegenopenai/codexSkill133kyesterdayApache-2.0A113Codex
playwright-climicrosoft/playwrightSkill99kyesterdayApache-2.0A19Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginnersSkill79k4d agoMITA200Claude Code, Codex
systematic-debuggingobra/superpowersSkill313k3d agoMITA21Claude Code
next-cache-components-adoptionvercel/next.jsSkill143ktodayMITA95Claude Code
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