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name: agent-prompting description: Write effective prompts for Task tool sub-agents, slash commands, and system prompts. Covers Claude 4.x prompting patterns, context engineering, output format specification, and parallel delegation. Use when spawning sub-agents, creating slash commands, or writing system prompts.

Agent Prompting & Delegation

Purpose: Write effective prompts that produce clear, structured outputs from sub-agents and custom commands.

Related: For CLAUDE.md/AGENTS.md file structure, see ai-documentation skill.

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Claude 4.x Prompting Changes

Claude 4.x models follow instructions more precisely. Adjust your prompting style:

Context awareness: Claude 4.x tracks its token budget. For long tasks, it may try to wrap up as context fills. Add this if needed:

CopyYour context will be compacted as needed - continue working fully without stopping early due to token concerns.

Parallel tool calling: Claude 4.x aggressively parallelizes. If you need sequential execution, say so explicitly.

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Core Principles

1. Clear over clever - Ambiguity is the enemy
2. Structure over prose - Bullets, tables, code blocks
3. Examples over explanations - Show what you want
4. Context engineering > prompt engineering - Right context matters more than perfect wording
5. Reasoning over commands - Explain WHY, not just WHAT

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Essential Prompt Components

Required

1. Clear Objective - What success looks like in one sentence
2. Success Criteria - Measurable outcomes
3. Expected Output Format - Structure specified

Recommended

1. Context - Only what's directly relevant (not everything)
2. Error Handling - What to do if not found/fails
3. Files Hint - Where to start looking

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Prompt Template

Copy[Clear objective in one sentence]

Success criteria:
- [Measurable outcome 1]
- [Measurable outcome 2]

Context: [Only what's directly relevant]

Expected output:
[Specific structure]

If [error condition]:
- [How to handle]

Start looking in: [Files hint]

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When to Use Agents vs Tools

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Parallel vs Sequential

PARALLEL (single message, multiple Tasks):

• Tasks are independent
• No shared state
• 5-10x speedup

SEQUENTIAL:

• Task B depends on Task A output
• Shared state (file modifications)
• Order matters

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Inline Standards by Agent Type

Include key standards in prompts. Even with CLAUDE.md, inline standards guarantee visibility.

Implementation Agents

CopyStandards:
- Logging: import logging; LOG = logging.getLogger(__name__)
- try/except only for connection errors (network, DB, cache)
- Type hints required, 80 char limit
- Don't run tests unless instructed

Output: Brief summary (3-5 sentences)

Test Agents

CopyStandards:
- 1:1 file mapping: tests/unit/test_<module>.py
- 95% coverage target
- Mock everything external to the function being tested
- Don't run tests unless instructed

Load: testing-standards skill

Review Agents

CopyFocus areas:
- Improper try/except (wrapping safe operations like dict.get)
- Logging setup (logging.getLogger(__name__))
- Type hints, line length

Output format:
{"status": "COMPLETE", "critical": [...], "important": [...], "minor": [...]}

Fix Agents

CopyStandards:
- Fix properly - no workarounds or # noqa shortcuts
- If architectural issue: escalate with options
- Max 3 attempts, then escalate

Output: Brief summary of what was fixed

Investigation Agents

CopyApproach:
- Start narrow, expand if needed
- Use Grep before Read (cheaper)
- Include file:line references in findings

Documentation Agents

CopyLoad ai-documentation skill first.

Standards:
- Concise over comprehensive
- Tables/bullets over paragraphs
- Include file:line references
- Context-loaded files: 100-400 lines
- Reference docs (docs/): can be longer

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Slash Commands

Location: .claude/commands/<command-name>.md

Structure:

CopyDescription of what this command does.

$ARGUMENTS will be replaced with user input after the command.

[Your prompt template here]

Example (.claude/commands/review-pr.md):

CopyReview the PR for ticket $ARGUMENTS.

1. Fetch PR context using gitlab scripts
2. Check code against project standards
3. Look for:
   - Improper error handling
   - Missing tests
   - Style violations
4. Output findings as inline comments

Usage: /review-pr INT-1234

Slash Command Best Practices

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System Prompts (CLAUDE.md)

For file structure and organization: See ai-documentation skill.

For content tone (Claude 4.x):

Copy# Good - Direct and clear
When modifying shared code, check who calls it first.
Use retry_run() for all MongoDB writes.

# Avoid - Aggressive/shouting
CRITICAL: You MUST ALWAYS check callers before modifying shared code!!!
NEVER forget to use retry_run() - THIS IS MANDATORY!

Key sections for CLAUDE.md:

1. Project purpose (1-2 sentences)
2. Key commands (build, test, lint)
3. Code patterns to follow
4. Common gotchas
5. What to ask about vs proceed

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Hooks

Location: .claude/settings.json or project settings

Types:

• PreToolUse - Before tool execution
• PostToolUse - After tool execution
• Notification - On events

Example (lint on file write):

Copy{
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "Write|Edit",
        "command": "python-code-quality --fix $FILE"
      }
    ]
  }
}

Hook outputs appear as <user-prompt-submit-hook> in conversation - treat as user feedback.

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Common Pitfalls

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Quick Reference

Before spawning an agent:

1. Is my objective clear in one sentence?
2. Will the agent know when it's done?
3. Have I specified the output format?
4. Can I run this in parallel with other tasks?
5. Am I using normal language (not SHOUTING)?

Before writing a slash command:

1. Does this need to be reusable?
2. Is there a single clear purpose?
3. Am I using $ARGUMENTS for variable input?

Before updating CLAUDE.md:

1. Load ai-documentation skill
2. Is this context-loaded? Keep it concise
3. Am I stating things once, clearly?