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 jeffreytse/grimoire-core --skill apply-grow-coachinggit clone --depth 1 https://github.com/jeffreytse/grimoire-coreWrote 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/jeffreytse/grimoire-core/apply-grow-coaching)<a href="https://agentmods.dev/skills/jeffreytse/grimoire-core/apply-grow-coaching"><img src="https://agentmods.dev/badge/skills/jeffreytse/grimoire-core/apply-grow-coaching/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/jeffreytse/grimoire-core/apply-grow-coaching"><img src="https://agentmods.dev/badge/skills/jeffreytse/grimoire-core/apply-grow-coaching.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 | $0.00050 | $0.02226 |
| Opus 5 | $0.00025 | $0.01113 |
| Sonnet 5 | $0.00010 | $0.00445 |
| Haiku 4.5 | $0.00005 | $0.00223 |
Grade A, and why
apply-grow-coaching 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 7d 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 — 148 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Apply GROW Coaching
Use the GROW model — Goal, Reality, Options, Will — to coach a direct report through a problem or development challenge by asking questions rather than giving answers.
Why This Is Best Practice
Adopted by: Google's Project Oxygen (2008–2018) identified coaching as the #1 behavior of effective managers across all Google manager effectiveness surveys; the GROW model originated with John Whitmore and Timothy Gallwey, was formalized in the 1980s at McKinsey, and is now the standard coaching framework taught in corporate leadership programs at Google, Microsoft, Unilever, and the International Coaching Federation (ICF); Michael Bungay Stanier's "The Coaching Habit" — built on the same principles — has sold 1M+ copies and is used in manager training at LinkedIn, Slack, and Shopify Impact: Google's Project Oxygen data showed that managers with high coaching scores had direct reports with significantly higher performance ratings, lower attrition, and higher satisfaction scores; the key causal mechanism: coaching-style managers build employee self-sufficiency, while advice-giving managers build dependency — dependency requires continuous manager involvement and collapses when the manager is unavailable; Whitmore's research documents that people are 3–4× more likely to follow through on solutions they generated themselves versus solutions given to them Why best: Advice-giving (the default manager behavior) creates the right answer in the short term but the wrong habit in the long term — the employee learns to wait for the manager's answer rather than developing their own judgment; GROW provides a repeatable four-stage structure that guides employees to their own solutions while the manager facilitates, making the manager a multiplier rather than a bottleneck
Sources: Whitmore "Coaching for Performance" (Nicholas Brealey Publishing, 5th ed. 2017); Google re:Work "Guide: Coach Your Employees" (rework.withgoogle.com); ICF "Core Competency Framework" (coachingfederation.org); Bungay Stanier "The Coaching Habit" (Box of Crayons Press, 2016)
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.
- 7d ago First seen · 148 lines · 50 tokens per session scan A ff41bac9ce82
apply-grow-coaching is a skill published in the GitHub repository jeffreytse/grimoire-core (4 stars, last pushed 21d ago), licensed MIT. It adds 50 tokens to every session and 2,226 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 2026-09-03.
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