ChatGPTBeginner7 min readUpdated Jun 17, 2026

Custom GPT: Sales Discovery Call Coach

A Custom GPT that role-plays a target ICP, runs a mock discovery call, then critiques the rep's questions against MEDDIC.

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Grab a structured copy of "Custom GPT: Sales Discovery Call Coach" as JSON (for programmatic import) or Markdown (for docs and README files). Both are licensed CC-BY-4.0 with attribution.

Overview

Sales training doesn't scale past a handful of reps. This Custom GPT plays the role of a specific ICP (e.g. VP of Ops at a 200-person e-commerce brand), lets a rep run a mock discovery call, then grades the conversation against MEDDIC or your custom qualification framework.

How it works

  1. GPT builder with a Knowledge file of your ICPs and qualification framework.
  2. System prompt: 'You are {persona}. Respond only in-character. When the rep says /debrief, drop character and grade against the framework.'
  3. Rep runs the conversation in one thread.
  4. Debrief produces a structured scorecard + recommended next questions.

Benefits

  • Every rep gets unlimited practice reps without a coach.
  • Consistent scoring rubric across the team.
  • New hires ramp in weeks, not quarters.

Use cases

  • Sales enablement teams onboarding new AEs.
  • SDR teams practicing objection handling.
  • Founders selling before they hire a sales lead.

Step-by-step guide

Step 1: Author 3-5 persona files

Each persona: role, company profile, current tools, top pains, budget signals, common objections.

Step 2: Define the framework

MEDDIC, BANT, or your custom fields. Include the grading rubric (1-5 per pillar).

Step 3: Write the meta-prompt

Emphasise staying in character until the /debrief trigger. Give one paragraph on tone (curt CFO vs curious VP of Ops).

Step 4: Test with an internal rep

First-pass: does the persona feel real? Second-pass: is the scoring specific?

Step 5: Publish to team

Share within workspace. Add link to onboarding docs and weekly coaching agendas.

Step 6: Rotate personas monthly

Add new personas from real deal debriefs. Retire ones that no longer reflect your market.

Example

Rep: 'How are you handling returns today?'
Persona: 'Manually. It's the reason my ops lead threatened to quit last quarter.'
/debrief → Metrics: 4/5 (probed pain), Economic Buyer: 2/5 (didn't ask), Decision Criteria: 3/5.

FAQs

Related resources

Workflows, articles, and tools that pair with this build.