From grimoire
Guides new or transitioning people managers through the first 90 days using a relationship-first approach to build trust, establish authority, and avoid common failure modes.
How this skill is triggered — by the user, by Claude, or both
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/grimoire:plan-manager-transitionThe summary Claude sees in its skill listing — used to decide when to auto-load this skill
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.
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.
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
Sources: Hill "Becoming a Manager" (HBS Press, 2003); Watkins "The First 90 Days" (HBS Press, 2013); Bock "Work Rules!" (Twelve, 2015); McKinsey "Making Leadership Transitions Work" (2012)
The universal new-manager mistake: arriving with a change agenda and executing it immediately. The result: decisions made without understanding the context, perceived as imposing rather than leading, and trust deficit that takes months to repair.
The listening agenda (30 days before making any significant changes):
Individual conversations with every direct report (30–60 min each): Ask the same questions to each person:
1. "What's going well that you'd want me to preserve?"
2. "What's not working that you'd most want me to change?"
3. "What do you need from me to do your best work?"
4. "What should I know about this team that I won't learn from watching?"
5. "What are you working on that you're most proud of?"
Listen without committing. Take notes. Don't evaluate what you hear in the moment — evaluate it after all conversations are complete, when you have the full picture.
Individual conversations with key stakeholders: Who does your team serve? Who depends on your team? Who can make or break your team's effectiveness? Have the same type of listening conversation with each.
Team history assessment:
30-day synthesis: At the end of the first 30 days, synthesize what you've heard into 3 categories:
Share this synthesis with your manager and with the team. Showing them you listened signals that the conversations were real, not performative.
With the listening phase complete and your context established, begin establishing the patterns that will define how you manage.
Establish your one-on-one practice: By day 30 at the latest, standing one-on-ones with every direct report. These are their time — not status reports. Establish the format: "This time is for what's on your mind. I'll have an agenda section, but the bulk of the time is yours."
Establish how you'll communicate:
Don't wait for these norms to emerge organically — name them explicitly.
Make 1–2 visible, small changes based on your listening: Pick something from the "what's broken" list that is (a) clearly impacting the team, (b) within your authority to fix, and (c) not politically complex. Fix it. Tell the team you fixed it based on what they told you.
This demonstrates that the listening phase was real and that your authority is in service of the team's effectiveness, not your agenda.
By day 60, you have context, relationships, and established patterns. Now you can begin taking ownership of the team's delivery in a genuine way.
Set your initial direction: Synthesize your understanding into a clear statement of:
Share this explicitly with the team. Not as a directive from authority, but as a synthesis of what you've learned and what you believe is needed: "Based on what I've heard from you and from our stakeholders, here's where I think we should focus. Does this match your view? What am I missing?"
Identify your key people: By day 90, you should know:
run-underperformance-conversation)Begin calibrating your management approach to each person's situation (see apply-situational-leadership).
Deliver a visible win: By day 90, the team should have delivered something meaningful together that you can point to. This doesn't have to be large — it has to be tangible evidence that the team is effective under your management.
If you were promoted from within the team — you previously worked alongside the people you now manage — you face specific additional risks:
The peer-to-friend trap: your previous relationships were peer relationships; now they are manager-report relationships; some former peers will struggle to shift, and some will test the boundary; be warm but clear that your role has changed.
The technical-expert trap: you were promoted because you were the best at the technical work; the instinct is to continue being the best at the technical work; the job is now to make the team collectively better at the technical work, not to do it yourself.
The favorites trap: you know some team members much better than others because of your prior peer relationship; be explicitly aware of this and invest disproportionately in getting to know the people you didn't work closely with before.
apply-situational-leadership).npx claudepluginhub jeffreytse/grimoire --plugin grimoireStructures a new direct report's first 30–90 days with explicit goals, relationship introductions, and early wins so the hire builds context and trust before taking on full scope.
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