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Refactor code structure for improved readability and maintainability
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catlog22
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.ccw/workflows/tool-strategy.md
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.ccw/workflows/tool-strategy.md
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# Tool Strategy - When to Use What
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> **Focus**: Decision triggers and selection logic, NOT syntax (already registered with Claude)
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## Quick Decision Tree
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```
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Need context?
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├─ Exa available? → Use Exa (fastest, most comprehensive)
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├─ Large codebase (>500 files)? → codex_lens
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├─ Known files (<5)? → Read tool
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└─ Unknown files? → smart_search → Read tool
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Need to modify files?
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├─ Built-in Edit fails? → mcp__ccw-tools__edit_file
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└─ Still fails? → mcp__ccw-tools__write_file
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Need to search?
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├─ Semantic/concept search? → smart_search (mode=semantic)
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├─ Exact pattern match? → Grep tool
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└─ Multiple search modes needed? → smart_search (mode=auto)
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```
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---
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## 1. Context Gathering Tools
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### Exa (`mcp__exa__get_code_context_exa`)
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**Use When**:
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- ✅ Researching external APIs, libraries, frameworks
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- ✅ Need recent documentation (post-cutoff knowledge)
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- ✅ Looking for implementation examples in public repos
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- ✅ Comparing architectural patterns across projects
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**Don't Use When**:
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- ❌ Searching internal codebase (use smart_search/codex_lens)
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- ❌ Files already in working directory (use Read)
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**Trigger Indicators**:
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- User mentions specific library/framework names
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- Questions about "best practices", "how does X work"
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- Need to verify current API signatures
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---
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### read_file (`mcp__ccw-tools__read_file`)
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**Use When**:
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- ✅ Reading multiple related files at once (batch reading)
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- ✅ Need directory traversal with pattern matching
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- ✅ Searching file content with regex (`contentPattern`)
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- ✅ Want to limit depth/file count for large directories
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**Don't Use When**:
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- ❌ Single file read → Use built-in Read tool (faster)
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- ❌ Unknown file locations → Use smart_search first
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- ❌ Need semantic search → Use smart_search or codex_lens
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**Trigger Indicators**:
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- Need to read "all TypeScript files in src/"
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- Need to find "files containing TODO comments"
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- Want to read "up to 20 config files"
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**Advantages over Built-in Read**:
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- Batch operation (multiple files in one call)
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- Pattern-based filtering (glob + content regex)
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- Directory traversal with depth control
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---
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### codex_lens (`mcp__ccw-tools__codex_lens`)
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**Use When**:
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- ✅ Large codebase (>500 files) requiring repeated searches
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- ✅ Need semantic understanding of code relationships
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- ✅ Working across multiple sessions (persistent index)
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- ✅ Symbol-level navigation needed
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**Don't Use When**:
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- ❌ Small project (<100 files) → Use smart_search (no indexing overhead)
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- ❌ One-time search → Use smart_search or Grep
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- ❌ Files change frequently → Indexing overhead not worth it
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**Trigger Indicators**:
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- "Find all implementations of interface X"
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- "What calls this function across the codebase?"
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- Multi-session workflow on same codebase
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**Action Selection**:
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- `init`: First time in new codebase
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- `search`: Find code patterns
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- `search_files`: Find files by path/name pattern
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- `symbol`: Get symbols in specific file
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- `status`: Check if index exists/is stale
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- `clean`: Remove stale index
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---
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### smart_search (`mcp__ccw-tools__smart_search`)
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**Use When**:
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- ✅ Don't know exact file locations
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- ✅ Need concept/semantic search ("authentication logic")
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- ✅ Medium-sized codebase (100-500 files)
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- ✅ One-time or infrequent searches
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**Don't Use When**:
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- ❌ Known exact file path → Use Read directly
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- ❌ Large codebase + repeated searches → Use codex_lens
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- ❌ Exact pattern match → Use Grep (faster)
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**Mode Selection**:
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- `auto`: Let tool decide (default, safest)
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- `exact`: Know exact pattern, need fast results
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- `fuzzy`: Typo-tolerant file/symbol names
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- `semantic`: Concept-based ("error handling", "data validation")
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- `graph`: Dependency/relationship analysis
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**Trigger Indicators**:
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- "Find files related to user authentication"
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- "Where is the payment processing logic?"
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- "Locate database connection setup"
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---
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## 2. File Modification Tools
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### edit_file (`mcp__ccw-tools__edit_file`)
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**Use When**:
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- ✅ Built-in Edit tool failed 1+ times
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- ✅ Need dry-run preview before applying
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- ✅ Need line-based operations (insert_after, insert_before)
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- ✅ Need to replace all occurrences
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**Don't Use When**:
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- ❌ Built-in Edit hasn't failed yet → Try built-in first
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- ❌ Need to create new file → Use write_file
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**Trigger Indicators**:
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- Built-in Edit returns "old_string not found"
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- Built-in Edit fails due to whitespace/formatting
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- Need to verify changes before applying (dryRun=true)
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**Mode Selection**:
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- `mode=update`: Replace text (similar to built-in Edit)
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- `mode=line`: Line-based operations (insert_after, insert_before, delete)
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---
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### write_file (`mcp__ccw-tools__write_file`)
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**Use When**:
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- ✅ Creating brand new files
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- ✅ MCP edit_file still fails (last resort)
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- ✅ Need to completely replace file content
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- ✅ Need backup before overwriting
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**Don't Use When**:
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- ❌ File exists + small change → Use Edit tools
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- ❌ Built-in Edit hasn't been tried → Try built-in Edit first
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**Trigger Indicators**:
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- All Edit attempts failed
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- Need to create new file with specific content
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- User explicitly asks to "recreate file"
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---
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## 3. Decision Logic
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### File Reading Priority
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```
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1. Known single file? → Built-in Read
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2. Multiple files OR pattern matching? → mcp__ccw-tools__read_file
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3. Unknown location? → smart_search, then Read
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4. Large codebase + repeated access? → codex_lens
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```
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### File Editing Priority
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```
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1. Always try built-in Edit first
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2. Fails 1+ times? → mcp__ccw-tools__edit_file
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3. Still fails? → mcp__ccw-tools__write_file (last resort)
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```
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### Search Tool Priority
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```
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1. External knowledge? → Exa
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2. Exact pattern in small codebase? → Built-in Grep
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3. Semantic/unknown location? → smart_search
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4. Large codebase + repeated searches? → codex_lens
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```
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---
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## 4. Anti-Patterns
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**Don't**:
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- Use codex_lens for one-time searches in small projects
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- Use smart_search when file path is already known
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- Use write_file before trying Edit tools
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- Use Exa for internal codebase searches
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- Use read_file for single file when Read tool works
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**Do**:
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- Start with simplest tool (Read, Edit, Grep)
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- Escalate to MCP tools when built-ins fail
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- Use semantic search (smart_search) for exploratory tasks
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- Use indexed search (codex_lens) for large, stable codebases
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- Use Exa for external/public knowledge
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