Understanding `<important if>` Relevance Gating in improve-claude-md

The <important if="…"> tag is a lightweight XML-style relevance gating mechanism that allows Claude Code to focus only on conditionally relevant sections of a CLAUDE.md file based on specific task contexts.

The improve-claude-md skill in the humanlayer/skills repository introduces a structured approach to managing context in AI-assisted coding workflows. By wrapping situation-specific guidance in <important if> tags, developers can signal precisely when certain instructions apply, preventing the model from ignoring useful guidance while keeping foundational context always visible.

What is <important if> Relevance Gating?

The relevance gating mechanism addresses a fundamental challenge in AI coding assistants: Claude Code prepends a system reminder stating that "this context may or may not be relevant." Without explicit signals, the model may ignore guidance that doesn't appear immediately pertinent to the current task.

The solution implemented in plugins/improve-claude-md/skills/improve-claude-md/SKILL.md uses a custom XML-style tag structure:

<important if="condition"> … </important>

This pattern echoes the relevance signaling used in Claude's own system prompt, providing a clear relevance signal that cuts through the vague "may or may not be relevant" framing (see line 16 of SKILL.md). This approach ensures that conditionally relevant sections are explicitly marked rather than left to chance interpretation.

How the Relevance Gating Mechanism Works

When processing a CLAUDE.md file, the skill applies a systematic transformation process:

1. Identify sections that apply only to specific situations, such as "when adding imports" or "when creating new components"

2. Encapsulate each situational section in its own <important if="…"> block using a narrow, explicit condition

3. Preserve foundational context (project identity, map, tech stack) at the top of the file as bare markdown, since this information is always needed

This structure ensures that global project information remains constantly visible while tactical guidance only surfaces when the specified condition matches the current task context.

Design Principles for Effective Gating

The skill enforces specific design principles to maximize the effectiveness of relevance gating, as documented in the source files.

Foundational Context Stays Bare

Global information such as project identity, architecture maps, and technology stack descriptions should remain as plain markdown without any wrapping tags. According to plugins/improve-claude-md/skills/improve-claude-md/SKILL.md (line 22), this ensures the model always sees critical baseline context regardless of the specific task being performed.

Conditions Must Be Specific

Broad conditions dilute the effectiveness of relevance gating. The source documentation explicitly discourages vague triggers like you are writing or modifying any code, labeling this a Bad example (line 32) because it fails to provide meaningful filtering. Instead, narrow triggers such as you are adding or modifying imports or you are creating new components are recommended (line 41), as they precisely target the relevant context window.

Keep It Concise

The skill emphasizes brevity—only the most pertinent rules should be included in the gated sections. Everything else should be removed (such as linter-related instructions that duplicate CI functionality) or moved to separate reference files to prevent prompt bloat.

Practical Example: Before and After

Consider a typical CLAUDE.md file before relevance gating:

# CLAUDE.md

Express API + React frontend in a Turborepo monorepo.

## Project map

- apps/api/ – Express REST API
- apps/web/ – React SPA

## Coding Standards

- Use named exports
- Use functional components with TypeScript interfaces for props
- Use camelCase for variables, PascalCase for components

After transformation by improve-claude-md, the file uses targeted relevance gating:

# CLAUDE.md

Express API + React frontend in a Turborepo monorepo.

## Project map

- apps/api/ – Express REST API
- apps/web/ – React SPA

<important if="you are adding or modifying imports or exports">
- Use named exports (no default exports)
</important>

<important if="you are creating new components">
- Use functional components with TypeScript interfaces for props
</important>

<important if="you are creating new files or directories">
- Use camelCase for file and directory names
</important>

In this transformed version, the generic "Coding Standards" section splits into three targeted <important if> blocks, each with a precise trigger. The foundational Project map remains bare, ensuring constant visibility.

Benefits of Using <important if> Tags

Implementing relevance gating in your CLAUDE.md files provides several advantages:

• Higher instruction adherence – The model receives an explicit "this part matters when X happens" signal, increasing the likelihood it follows the guidance reliably

• Noise reduction – Irrelevant sections remain present but are weighted appropriately, preventing the "everything-or-nothing" problem where either all context is ignored or the prompt becomes too cluttered

• Scalable documentation – Teams can add new <important if> blocks incrementally without bloating the prompt, as each block is processed independently based on task relevance

Summary

• The <important if> relevance gating mechanism uses XML-style tags to mark conditionally relevant sections in CLAUDE.md files
• Foundational project context should remain as bare markdown without tags to ensure constant visibility
• Conditions must be specific and narrow (e.g., "you are adding imports") rather than broad ("you are writing code")
• The skill processes files by identifying situational rules, wrapping them in <important if="condition"> blocks, and leaving global context untouched
• This approach improves Claude Code's adherence to project-specific guidelines by providing clear, task-relevant signals

Frequently Asked Questions

How does <important if> differ from regular markdown comments?

Unlike HTML comments or standard markdown that remain invisible to the model, <important if> tags are parsed as active structural elements. They explicitly tell Claude Code when to prioritize the enclosed content based on the current task context, whereas comments are typically ignored entirely or treated as non-semantic metadata.

Can I use multiple conditions in a single <important if> tag?

According to the implementation in plugins/improve-claude-md/skills/improve-claude-md/SKILL.md, each conditional section should have its own <important if="…"> block with a single, specific condition. This approach allows the model to evaluate relevance independently for each rule set rather than combining conditions, which could create ambiguous triggers.

What happens if the condition doesn't match the current task?

When the condition specified in the if attribute doesn't match the current task context, Claude Code treats the wrapped content as lower priority or potentially ignorable, while still maintaining access to the information. This differs from completely removing the content, as the model can still reference it if needed, but it won't receive the same weight as bare markdown or matching conditions.

Where is the improve-claude-md skill located in the repository?

The skill definition and relevance gating guidelines reside in plugins/improve-claude-md/skills/improve-claude-md/SKILL.md within the humanlayer/skills repository. The root README.md provides an overview of the entire skills collection and links to individual plugins including improve-claude-md.

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