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 plan-manager-transitiongit 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/plan-manager-transition)<a href="https://agentmods.dev/skills/jeffreytse/grimoire-core/plan-manager-transition"><img src="https://agentmods.dev/badge/skills/jeffreytse/grimoire-core/plan-manager-transition/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/plan-manager-transition"><img src="https://agentmods.dev/badge/skills/jeffreytse/grimoire-core/plan-manager-transition.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 | $0.00061 | $0.02189 |
| Opus 5.5 | $0.00024 | $0.00876 |
| Sonnet 5.5 | $0.00012 | $0.00438 |
| Haiku 4.5 | $0.00006 | $0.00219 |
Grade A, and why
plan-manager-transition 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.
How it starts
The opening of the file, as written. The whole thing — 129 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Plan Manager Transition
Navigate the first 90 days as a new people manager by resisting the impulse to direct immediately, investing in relationships and understanding before making changes, and building authority through demonstrated judgment rather than claimed title.
Why This Is Best Practice
Adopted by: Linda Hill's "Becoming a Manager" (based on studying 19 managers through their entire first year as managers) is the most rigorously researched account of the new manager experience and is taught at HBS, Wharton, and Kellogg; Watkins's "The First 90 Days" is the most widely used new-executive transition framework globally and is used in executive coaching at McKinsey, Bain, and most major corporations; Google's research on new manager effectiveness (from Laszlo Bock's "Work Rules!") identified the first-90-day relationship investment as the primary predictor of long-term manager effectiveness Impact: Hill's research found that new managers universally underestimated how different management is from individual contribution — and that the most common failure mode was attempting to apply the same direct-action approach that made them successful as individual contributors; McKinsey research on executive transitions found that 40% of new leaders fail within 18 months, and that the primary cause is moving to execution before establishing relationships and understanding the team's context; Watkins's research (500+ executive transitions) found that new leaders who invested the first 30 days in listening and learning before acting made decisions with dramatically higher team buy-in and reversibility Why best: New managers face a fundamental transition: from an identity as an individual contributor (where success comes from personal output and expertise) to an identity as a manager (where success comes entirely from the team's output and development); this transition requires unlearning the behaviors that produced individual success and replacing them with counterintuitive behaviors — listening more than directing, asking more than telling, building relationships before executing; the instinct to demonstrate competence through action produces premature changes that damage trust before it has been built
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.
- 1mo ago First seen · 129 lines · 61 tokens per session scan A 5450526728da
plan-manager-transition is a skill published in the GitHub repository jeffreytse/grimoire-core (5 stars, last pushed 5d ago), licensed MIT. It adds 61 tokens to every session and 2,189 once invoked, about $0.0002 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 2026-09-03.
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