How to Write a Project Brief for Claude

How to Write a Project Brief for Claude

A project brief for Claude follows the same principles as any AI project brief — structured business context that transforms generic outputs into specific, useful ones. But Claude has distinct strengths you can leverage with a few targeted adjustments.

Claude, built by Anthropic, excels at following precise instructions, handling long documents, and producing structured output. A brief designed for Claude can be more detailed and more explicit about formatting expectations than what you might write for other tools.

Why This Matters

Claude is increasingly the tool of choice for founders and operators who need reliable, high-quality output on complex business tasks. But like any AI, it starts every session knowing nothing about you. Without context, Claude's outputs are articulate but generic.

A well-structured brief turns Claude from a general-purpose writing assistant into something closer to a team member who understands your business.

Claude's Key Strengths for Brief-Based Work

Longer context window. Claude supports up to 200K tokens of context. This means your brief can include more detail — product documentation, example outputs, competitive analysis — without hitting limits.

Precise instruction following. Claude is particularly good at following explicit formatting and behavior directives. You can include rules like "always use bullet points for recommendations" or "never suggest solutions outside our tech stack" and Claude will reliably comply.

Structured output. Claude handles markdown headers, tables, and structured formats well. Your brief can specify exact output formats and Claude will match them consistently.

How to Structure Your Claude Brief

The core sections are the same as the ChatGPT brief:

1. Business overview — what you do, for whom, and why
2. Target audience — demographics, pain points, language
3. Brand voice — tone, word choices, examples
4. Competitive positioning — what makes you different
5. Product details — features, pricing, use cases
6. Operations context — team, tools, workflows

For Claude, add these additional sections:

Output Formatting Rules

Claude follows formatting instructions reliably. Add explicit rules:

## Output Rules
- Use H2 headers for main sections, H3 for subsections
- Keep paragraphs under 4 sentences
- Use bullet points for lists of 3+ items
- Always include a one-sentence summary at the top of any document
- Format code examples in markdown code blocks
- When comparing options, use a table format

Behavioral Constraints

Tell Claude what to avoid:

## Constraints
- Do not suggest tools or platforms we do not use
- Do not recommend strategies requiring a team larger than 5
- If you are unsure about a claim, say so instead of guessing
- Never use the words: leverage, synergy, revolutionary, game-changing
- If the task is ambiguous, ask a clarifying question before proceeding

Example Outputs

Claude learns well from examples. Include 1-2 samples of ideal output:

## Example: Good Email Copy
Subject: Your documents are ready to review
Body: Hi [Name], 3 new documents from [Client] just landed in your portal.
Click here to review and approve them. Takes about 2 minutes.

Common Mistakes

Underselling Claude's context capacity. Do not trim your brief to 500 words because you are afraid of overwhelming the model. Claude handles long context well. A 3,000-word brief with examples will produce better results than a 500-word summary.

Not using explicit formatting rules. Claude follows rules precisely — but only if you state them. Vague instructions like "make it look good" waste Claude's strongest capability.

Copying a ChatGPT brief without adjustments. The core content transfers, but adding Claude-specific formatting directives and behavioral constraints significantly improves output quality.

Forgetting to include constraints. Without explicit boundaries, Claude will suggest anything that seems reasonable. If your business has limitations (budget, team size, tech stack), state them in the brief.

When to Use NoExplain

NoExplain generates a structured brief that works across both ChatGPT and Claude. It analyzes your business, extracts the relevant context, and formats it for AI consumption. You can then add Claude-specific formatting rules and constraints on top of the generated base brief.