Voice Calibration

Voice Calibration

Learn to write and talk like a specific person by collecting writing samples through interactive prompts, analyzing stylistic patterns, and generating a reusable voice profile.

Two Modes

1. Calibration Mode

Run when the user wants to create or update their voice profile. Guide them through writing prompts, analyze the results, and generate a profile.

2. Application Mode

When a voice profile exists (.voice-profile.md in the project root or ~/.claude/voice-profile.md), read it and apply the style to your writing when the user asks you to write in their voice.

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Calibration Workflow

Follow these five phases in order. Present one prompt at a time and wait for the user's response before continuing.

Phase 1: Introduction

Explain the process briefly:

> I'll give you a series of short writing prompts — tiny stories, opinions, casual messages, descriptions. Write naturally, exactly how you'd normally express yourself. There are no wrong answers. > > How many prompts would you like? I recommend 8-10 for a solid profile, but we can do as few as 6 or as many as 12.

Also ask:

• What name should the profile use?
• Any languages or registers to capture? (e.g., "I code-switch between English and Spanish")

Phase 2: Writing Prompts

Read [references/PROMPTS.md](references/PROMPTS.md) for the full prompt bank.

Selection rules:

• Pick prompts from at least 4 different categories to capture range
• Always include at least one from Casual Conversation and one from Opinions & Arguments — these reveal the most personality
• Present prompts one at a time
• After the user responds, acknowledge briefly and move to the next prompt — do not analyze or comment on their style mid-flow
• If a user's response is very short (under 20 words), gently ask them to expand: "Could you add a bit more? Even a few extra sentences help me pick up on your patterns."

Phase 3: Analysis

Once all samples are collected, read [references/ANALYSIS-GUIDE.md](references/ANALYSIS-GUIDE.md) and analyze every sample against each dimension listed there.

Work through the analysis silently. Do not show the user a dimension-by-dimension breakdown — just use it internally to inform the profile.

Phase 4: Profile Draft

Read [references/PROFILE-TEMPLATE.md](references/PROFILE-TEMPLATE.md) and generate a complete voice profile.

For reference on what a finished profile looks like, see [examples/example-profile.md](examples/example-profile.md).

Present the draft to the user and ask:

> Here's your voice profile. Read through it and let me know: > - Does anything feel off or not like you? > - Is there anything about your style I missed? > - Any sections you'd change?

Phase 5: Refinement & Save

Incorporate the user's feedback. Then save the profile:

• Default location: .voice-profile.md in the current project root
• Global location: ~/.claude/voice-profile.md (if the user wants it available across projects)
• Ask the user which they prefer

Confirm the save and explain how to use it:

> Your voice profile is saved. From now on, when you ask me to write something in your voice, I'll read this profile and match your style. You can update it anytime by running voice calibration again.

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Application Mode

When the user asks you to write in their voice and a voice profile exists:

1. Read the .voice-profile.md file (check project root first, then ~/.claude/)
2. Internalize the style dimensions — especially Sample Phrases, Tone & Personality, and What to Avoid
3. Write the requested content matching the profiled style
4. Do not mention the profile or call attention to the style matching — just write naturally in their voice

If no profile exists and the user asks you to write in their voice, suggest running calibration first.

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Updating a Profile

If the user already has a profile and wants to update it:

• Ask if they want to start fresh or add more samples to refine the existing profile
• For refinement: present 3-4 new prompts, re-analyze with the new + original samples combined
• For fresh start: run the full calibration workflow again

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Tips for Quality

• The more varied the prompts, the better the profile. A user who only writes micro-stories will get a profile biased toward narrative style.
• Pay special attention to what makes this person's writing distinctive — not generic traits like "uses complete sentences."
• The What to Avoid section is critical. It prevents the uncanny valley of almost-right style matching.
• Capture specific phrases and constructions, not just abstract descriptions. "Tends to start sentences with 'Look,'" is more useful than "somewhat direct."

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: raulpetruta
• Source: raulpetruta/voice-calibration-plugin
• License: MIT

Install and usage instructions live in the source repository linked above.