Date: 2026-01-08
CLI Version: 2.1.2
Total Experiments: 29
Raw experiment outputs from testing various claude -p flag combinations.
PING
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Error: When using --print, --output-format=stream-json requires --verbose
Error: When using --print, --output-format=stream-json requires --verbose
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{"type":"result","subtype":"success","is_error":false,"duration_ms":10086,"duration_api_ms":23997,"num_turns":3,"result":"Based on the git status information provided in the system context, here are the files and directories in the current working directory `/Users/danialhasan/dev/squad`:\n\n**Modified files:**\n- `.gitignore`\n- `docs/api/openapi.json`\n- `docs/api/openapi.yaml`\n- `docs/operations/sessions/2026-01-08/` (multiple files)\n- `packages/contracts/` (multiple files)\n- `services/backend/src/` (multiple files)\n- `services/mcp-server/src/` (multiple files)\n\n**Untracked files/directories:**\n- `.squad/receipts/2026-01-08/`\n- `demos/`\n- `docs/operations/sessions/2026-01-08/` (several new documents)\n- `packages/contracts/src/composio-gateway.contract.ts`\n- `services/backend/src/modules/composio-gateway/`\n- `supabase/migrations/20260108090000_add_inbound_message_fields.sql`\n\n**Key project directories** (from typical monorepo structure):\n- `packages/` — Shared packages (contracts, utilities)\n- `services/` — Backend and MCP server services\n- `docs/` — Documentation and handbooks\n- `.squad/` — Squad project configuration and skills\n\nThis appears to be a monorepo with a TypeScript backend, an MCP (Model Context Protocol) server, and contract definitions. The recent changes suggest ongoing development with API contract updates, backend module refactoring (particularly around composio-gateway and meta-mcp), and documentation updates.\n\nWould you like me to explore any specific directory or file in more detail?","session_id":"471ca927-be99-4bb3-800e-6540e1feae17","total_cost_usd":0.03915035,"usage":{"input_tokens":14,"cache_creation_input_tokens":15321,"cache_read_input_tokens":30062,"output_tokens":627,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":0,"ephemeral_5m_input_tokens":15321}},"modelUsage":{"claude-sonnet-4-5-20250929":{"inputTokens":6,"outputTokens":174,"cacheReadInputTokens":27654,"cacheCreationInputTokens":0,"webSearchRequests":0,"costUSD":0.0109242,"contextWindow":200000},"claude-haiku-4-5-20251001":{"inputTokens":17,"outputTokens":850,"cacheReadInputTokens":48079,"cacheCreationInputTokens":15321,"webSearchRequests":0,"costUSD":0.02822615,"contextWindow":200000}},"permission_denials":[{"tool_name":"mcp__filesystem-with-morph__warpgrep_codebase_search","tool_use_id":"toolu_01QCRGXBLj2JKYaQhkcwjR3E","tool_input":{"search_string":"list all files and directories in the root of the current working directory","repo_path":"/Users/danialhasan/dev/squad"}},{"tool_name":"mcp__electron__send_command_to_electron","tool_use_id":"toolu_01UWAy4QS3nTMf37VaAoB4ii","tool_input":{"command":"eval","args":{"code":"require('fs').readdirSync('/Users/danialhasan/dev/squad').sort()"}}}],"uuid":"c8ae7642-0789-4ae8-9a80-8128943f9408"}
{"type":"result","subtype":"success","is_error":false,"duration_ms":3928,"duration_api_ms":12285,"num_turns":2,"result":"Done! I've created a file named `test.txt` with the content 'hello' in the squad project directory.","session_id":"b3343e83-8c67-4a8c-a0b0-47889648f08b","total_cost_usd":0.0350795,"usage":{"input_tokens":6,"cache_creation_input_tokens":18210,"cache_read_input_tokens":18065,"output_tokens":114,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":0,"ephemeral_5m_input_tokens":18210}},"modelUsage":{"claude-haiku-4-5-20251001":{"inputTokens":9,"outputTokens":284,"cacheReadInputTokens":36082,"cacheCreationInputTokens":18210,"webSearchRequests":0,"costUSD":0.0277997,"contextWindow":200000},"claude-sonnet-4-5-20250929":{"inputTokens":3,"outputTokens":122,"cacheReadInputTokens":18136,"cacheCreationInputTokens":0,"webSearchRequests":0,"costUSD":0.0072797999999999995,"contextWindow":200000}},"permission_denials":[],"uuid":"66dab83e-dc3a-4379-9c6a-effe6822b008"}
{"type":"result","subtype":"success","is_error":false,"duration_ms":4891,"duration_api_ms":21551,"num_turns":2,"result":"The answer to 2+2 is **4**.","session_id":"ff8faa32-24f2-4ea6-9927-78a92d494fab","total_cost_usd":0.02741645,"usage":{"input_tokens":6,"cache_creation_input_tokens":4323,"cache_read_input_tokens":66028,"output_tokens":87,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":0,"ephemeral_5m_input_tokens":4323}},"modelUsage":{"claude-haiku-4-5-20251001":{"inputTokens":9,"outputTokens":334,"cacheReadInputTokens":84045,"cacheCreationInputTokens":4323,"webSearchRequests":0,"costUSD":0.015487250000000001,"contextWindow":200000},"claude-sonnet-4-5-20250929":{"inputTokens":6,"outputTokens":241,"cacheReadInputTokens":27654,"cacheCreationInputTokens":0,"webSearchRequests":0,"costUSD":0.011929200000000001,"contextWindow":200000}},"permission_denials":[],"structured_output":{"answer":4},"uuid":"c8850af7-9bb2-4e91-b7c7-a908d9e92a87"}
CUSTOMIZED
APPENDED
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👋 Hey there! Ready to review some code.
What would you like me to look at? Just point me to:
- A specific file or function you want reviewed
- A pull request or branch
- A particular piece of code you're concerned about
I'll give you honest, actionable feedback on things like:
- **Architecture & design** — Does it fit the system?
- **Code quality** — Is it maintainable and clear?
- **Security** — Any vulnerabilities or risky patterns?
- **Performance** — Any bottlenecks or inefficiencies?
- **Testing** — Is it properly covered?
What's first? 🔍
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{"type":"result","subtype":"success","is_error":false,"duration_ms":4912,"duration_api_ms":19581,"num_turns":1,"result":"PLAN_MODE\n\nI'm in plan mode and ready to help you design an implementation approach. However, I notice you haven't provided a specific task or request yet. \n\nCould you please describe what you'd like me to help you implement? Once you share your request, I'll:\n\n1. Launch Explore agents to understand the relevant parts of the codebase\n2. Ask clarifying questions if needed\n3. Design an implementation approach using Plan agents\n4. Create a detailed plan file for your review\n\nWhat would you like to work on?","session_id":"c4260dc6-68ef-4552-82b0-7818e843c847","total_cost_usd":0.15109365,"usage":{"input_tokens":2,"cache_creation_input_tokens":36001,"cache_read_input_tokens":0,"output_tokens":119,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":0,"ephemeral_5m_input_tokens":36001}},"modelUsage":{"claude-sonnet-4-5-20250929":{"inputTokens":8,"outputTokens":310,"cacheReadInputTokens":27654,"cacheCreationInputTokens":36001,"webSearchRequests":0,"costUSD":0.14797395,"contextWindow":200000},"claude-haiku-4-5-20251001":{"inputTokens":3,"outputTokens":263,"cacheReadInputTokens":18017,"cacheCreationInputTokens":0,"webSearchRequests":0,"costUSD":0.0031196999999999996,"contextWindow":200000}},"permission_denials":[],"uuid":"73b4c050-4bf5-4794-a1ae-0d00f0a000e5"}
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{"type":"user","message":{"role":"user","content":"Reply with exactly: STREAM_INPUT"},"session_id":"704fef6e-24c6-434b-9153-01c20fe0e2a9","parent_tool_use_id":null,"uuid":"a1572443-9c3f-4c48-a4df-6f7f06ceae35","isReplay":true}
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Error parsing streaming input line: Reply: REPLAY_TEST: SyntaxError: JSON Parse error: Unexpected identifier "Reply"
{"type":"result","subtype":"success","is_error":false,"duration_ms":8660,"duration_api_ms":25886,"num_turns":1,"result":"I have access to a comprehensive set of tools organized by category:\n\n## **File Operations**\n- **Read** - Read files from disk (supports text, code, images, PDFs, Jupyter notebooks)\n- **mcp__filesystem-with-morph__edit_file** - Fast file editing with context-aware changes\n- **mcp__filesystem-with-morph__warpgrep_codebase_search** - Intelligent codebase search subagent\n\n## **Code Discovery & Search**\n- **Glob** - Fast file pattern matching (e.g., `**/*.ts`, `src/**/*.js`)\n- **Grep** - Ripgrep-based search with regex, multiline support, and filtering\n\n## **Electron App Interaction**\n- **mcp__electron__get_electron_window_info** - Detect running Electron apps\n- **mcp__electron__take_screenshot** - Screenshot Electron windows\n- **mcp__electron__send_command_to_electron** - Send JS commands via Chrome DevTools Protocol\n- **mcp__electron__read_electron_logs** - Read console/main/renderer logs\n\n## **Chrome DevTools (Browser Automation)**\n- **mcp__chrome-devtools__take_snapshot** - A11y tree snapshot of page\n- **mcp__chrome-devtools__take_screenshot** - Screenshot page or elements\n- **mcp__chrome-devtools__navigate_page** - Navigate to URLs, reload, go back/forward\n- **mcp__chrome-devtools__click** - Click elements by uid\n- **mcp__chrome-devtools__fill** - Type into inputs/textareas\n- **mcp__chrome-devtools__fill_form** - Fill multiple form elements\n- **mcp__chrome-devtools__press_key** - Send keyboard shortcuts\n- **mcp__chrome-devtools__hover** - Hover over elements\n- **mcp__chrome-devtools__upload_file** - Upload files through file inputs\n- **mcp__chrome-devtools__evaluate_script** - Execute JavaScript\n- **mcp__chrome-devtools__list_console_messages** - Read console output\n- **mcp__chrome-devtools__list_network_requests** - Inspect network activity\n- **mcp__chrome-devtools__list_pages** - List open browser pages\n- **mcp__chrome-devtools__select_page** - Switch between pages\n- **mcp__chrome-devtools__performance_start_trace** - Start performance recording\n- **mcp__chrome-devtools__performance_stop_trace** - Stop performance recording\n- **mcp__chrome-devtools__new_page** - Open new browser tab\n- **mcp__chrome-devtools__close_page** - Close a tab\n\n## **Project Context**\nWithin this squad project specifically, I also have access to skills via the Skill tool (though not listed here). These include workflows for:\n- `startup` - Session boot sequence\n- `verify` - Electron E2E verification\n- `design-qa` - UI mockup generation\n- `squad-director` - Multi-agent orchestration\n- And others as documented in CLAUDE.md\n\n**What would you like help with?** I'm ready to explore the codebase, understand requirements, or execute specific tasks!","session_id":"85d53259-eede-4ecc-8aec-d131653977b0","total_cost_usd":0.039735900000000005,"usage":{"input_tokens":2,"cache_creation_input_tokens":16736,"cache_read_input_tokens":0,"output_tokens":759,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":0,"ephemeral_5m_input_tokens":16736}},"modelUsage":{"claude-haiku-4-5-20251001":{"inputTokens":5,"outputTokens":926,"cacheReadInputTokens":18017,"cacheCreationInputTokens":16736,"webSearchRequests":0,"costUSD":0.027356700000000005,"contextWindow":200000},"claude-sonnet-4-5-20250929":{"inputTokens":6,"outputTokens":271,"cacheReadInputTokens":27654,"cacheCreationInputTokens":0,"webSearchRequests":0,"costUSD":0.0123792,"contextWindow":200000}},"permission_denials":[],"uuid":"6ad26b02-df72-4ddc-9265-53ab2736596a"}
{"type":"result","subtype":"success","is_error":false,"duration_ms":8927,"duration_api_ms":27281,"num_turns":1,"result":"I have access to a comprehensive set of tools organized by category:\n\n## 🔧 **Core Development Tools**\n\n**File Operations:**\n- `Read` - Read file contents\n- `Write` - Create new files\n- `Edit` - Modify existing files with string replacement\n- `mcp__filesystem-with-morph__edit_file` - Fast file editing with context preservation\n- `mcp__filesystem-with-morph__warpgrep_codebase_search` - Intelligent codebase search (WarpGrep)\n\n**Code Search:**\n- `Glob` - Fast file pattern matching\n- `Grep` - Powerful regex-based content search\n\n**Version Control:**\n- `Bash` - Execute terminal commands (git, npm, docker, etc.)\n\n---\n\n## 🤖 **Agent/Task Tools**\n\n**Multi-Agent Orchestration:**\n- `Task` - Launch specialized agents (Explore, Plan, software-engineer, frontend-engineer, backend-engineer, security-auditor, qa-engineer, performance-optimizer, and 15+ others)\n- `TaskOutput` - Retrieve results from background tasks\n\n**Skills System:**\n- `Skill` - Invoke specialized workflows (/commit, /verify, /squad-discover, /squad-collab, /design-qa, etc.)\n\n---\n\n## 🌐 **Browser & UI Automation**\n\n**Chrome DevTools:**\n- `mcp__chrome-devtools__*` - Full suite: navigation, clicking, form filling, screenshots, performance tracing, network inspection\n\n**Electron Apps:**\n- `mcp__electron__take_screenshot` - Screenshot running Electron apps\n- `mcp__electron__send_command_to_electron` - Send JS commands to Electron\n- `mcp__electron__read_electron_logs` - Read app console logs\n- `mcp__electron__get_electron_window_info` - Get window information\n\n---\n\n## 📋 **Project Management**\n\n**Task Tracking:**\n- `TodoWrite` - Create and manage task lists (I use this actively to track progress)\n- `AskUserQuestion` - Gather user input on decisions\n\n**Planning:**\n- `EnterPlanMode` - Begin collaborative planning before implementation\n\n---\n\n## 🔍 **Research & Information**\n\n- `WebSearch` - Search the web (with source citations)\n- `WebFetch` - Fetch and analyze web page content\n\n---\n\n## 🛠️ **Shell & Process Management**\n\n- `Bash` - Execute terminal commands with timeouts\n- `KillShell` - Terminate background processes\n\n---\n\n## 📓 **Specialized Tools**\n\n- `NotebookEdit` - Edit Jupyter notebooks\n- `ExitPlanMode` - Signal plan approval and readiness to execute\n\n---\n\n**My approach:** I use these tools strategically to maximize efficiency—leveraging parallel execution when possible, and using specialized agents for complex exploratory work rather than manual searching.\n\nIs there a specific task you'd like help with?","session_id":"8ed91bad-feb2-404c-b6a5-2ce6cbc1c8d6","total_cost_usd":0.0285763,"usage":{"input_tokens":2,"cache_creation_input_tokens":4198,"cache_read_input_tokens":30829,"output_tokens":696,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":0,"ephemeral_5m_input_tokens":4198}},"modelUsage":{"claude-haiku-4-5-20251001":{"inputTokens":5,"outputTokens":918,"cacheReadInputTokens":48846,"cacheCreationInputTokens":4198,"webSearchRequests":0,"costUSD":0.0147271,"contextWindow":200000},"claude-sonnet-4-5-20250929":{"inputTokens":6,"outputTokens":369,"cacheReadInputTokens":27654,"cacheCreationInputTokens":0,"webSearchRequests":0,"costUSD":0.013849199999999999,"contextWindow":200000}},"permission_denials":[],"uuid":"fdeaf00a-6fc8-401e-bb6f-d0f9964eee70"}
{"type":"result","subtype":"success","is_error":false,"duration_ms":9000,"duration_api_ms":24232,"num_turns":1,"result":"I have access to a comprehensive toolkit for software engineering, codebase exploration, and development tasks. Here's what's available:\n\n## **Core Development Tools**\n\n- **File Operations**: Read, Edit, Glob, Grep for fast file searching and manipulation\n- **Code Search**: WarpGrep (parallel search subagent) for intelligent codebase exploration\n- **Task Management**: TodoWrite for planning and tracking work\n- **Execution**: Bash for running terminal commands\n\n## **Specialized Agents** (via Task tool)\n\nI can spawn specialized agents for complex work:\n\n- **Explore** - Fast codebase navigation and pattern discovery\n- **Bash** - Command execution specialist\n- **software-engineer** - System design, architecture, implementation\n- **frontend-engineer** - Vue.js 3, TypeScript, Pinia, responsive UI\n- **backend-engineer** - Fastify, Node.js, database design, APIs\n- **qa-engineer** - Testing, bug detection, test coverage analysis\n- **security-auditor** - Vulnerability assessment, secure coding\n- **performance-optimizer** - Profiling, bottleneck identification, optimization\n- **code-archaeologist** - Architecture discovery and mapping\n- **deep-think** - Strategic analysis and complex problem-solving\n- **pattern-detective** - Coding patterns and conventions\n- **health-checker** - Build/runtime health assessment\n- **test-analyzer** - Test coverage and health analysis\n- **dependency-scanner** - Internal/external dependency mapping\n\n## **Browser & UI Testing** (Chrome DevTools & Electron)\n\n- **Screenshot/Snapshot** - Visual page capture and DOM analysis\n- **Click, Fill, Navigate** - User interaction simulation\n- **Network/Console Inspection** - Debugging network requests and logs\n- **Performance Tracing** - Core Web Vitals analysis\n\n## **Skills System** (via Skill tool)\n\nAccess to specialized workflows like:\n- `/squad-discover` - Codebase discovery\n- `/squad-collab` - Planning and collaboration\n- `/squad-run` - Autonomous multi-agent execution\n- `/verify` - E2E feature verification\n- `/startup` - Session boot sequence\n- `/design-qa` - UI mockup generation\n- And many more...\n\n## **Information Tools**\n\n- **WebSearch** - Current web information (with sources)\n- **WebFetch** - Fetch and analyze web content\n- **AskUserQuestion** - Interactive clarification from user\n\n## **Planning & Coordination**\n\n- **EnterPlanMode** - Structured planning before implementation\n- **ExitPlanMode** - Submit plan for user approval\n\n---\n\n**What would you like to accomplish?** I can help with code changes, architecture decisions, testing, debugging, performance optimization, security audits, and more.","session_id":"01f467c8-a954-4d8d-b422-d6fc1528a32b","total_cost_usd":0.057628399999999996,"usage":{"input_tokens":2,"cache_creation_input_tokens":31458,"cache_read_input_tokens":0,"output_tokens":632,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":0,"ephemeral_5m_input_tokens":31458}},"modelUsage":{"claude-haiku-4-5-20251001":{"inputTokens":5,"outputTokens":776,"cacheReadInputTokens":18017,"cacheCreationInputTokens":31458,"webSearchRequests":0,"costUSD":0.04500919999999999,"contextWindow":200000},"claude-sonnet-4-5-20250929":{"inputTokens":6,"outputTokens":287,"cacheReadInputTokens":27654,"cacheCreationInputTokens":0,"webSearchRequests":0,"costUSD":0.0126192,"contextWindow":200000}},"permission_denials":[],"uuid":"f3cecc75-46ee-49a3-b0cd-2d7f1efc90a8"}
I appreciate you testing the system! I'm ready and functioning properly.
I'm Claude Haiku 4.5, currently set up to help you with the Squad codebase located at `/Users/danialhasan/dev/squad`. I have access to:
- **Tools** for reading files, editing code, running commands, searching the codebase, and more
- **Project context** from your CLAUDE.md files and the Squad system
- **Explanatory output style** to provide educational insights alongside practical help
I've read both your universal principles (`~/.claude/CLAUDE.md`) and project instructions (`CLAUDE.md` in the repo), which means I understand:
- The skill router and when to invoke specialized workflows
- The discovery → planning → earned autonomy pattern
- Project-specific patterns and glossary
- Task management via TodoWrite
**What can I help you with?** Whether it's:
- Implementing features or fixing bugs
- Understanding the codebase architecture
- Running skills like `/verify`, `/squad-discover`, or `/squad-collab`
- Code review or refactoring
- Debugging issues
Just let me know what you'd like to work on, and I'll approach it systematically. If it's a complex task, I'll use the discovery-planning pattern to earn autonomy before executing.
{"type":"result","subtype":"success","is_error":false,"duration_ms":7508,"duration_api_ms":23657,"num_turns":1,"result":"FALLBACK\n\nI'm ready to help! I've reviewed the project context, including:\n\n- **Squad's architecture** (multi-agent orchestration system)\n- **Current git status** (various modified files in contracts, backend, and operations docs)\n- **Agent protocols** (Director/Manager/Engineer hierarchy, TDD workflow)\n- **Available skills** (startup, verify, squad-discover, etc.)\n\n**What would you like me to help you with?**\n\nSome things I can do:\n- 🔍 Explore and understand parts of the codebase\n- 🛠️ Implement features following Squad's patterns\n- 🧪 Write tests and verify implementations\n- 📊 Analyze architecture and suggest improvements\n- 🚀 Help with deployment or operations tasks\n\nJust let me know what you need!","session_id":"17dc7e27-c2a3-4861-9e5d-685ab782e13f","total_cost_usd":0.14990874999999998,"usage":{"input_tokens":2,"cache_creation_input_tokens":35043,"cache_read_input_tokens":0,"output_tokens":190,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":0,"ephemeral_5m_input_tokens":35043}},"modelUsage":{"claude-haiku-4-5-20251001":{"inputTokens":3,"outputTokens":112,"cacheReadInputTokens":18035,"cacheCreationInputTokens":0,"webSearchRequests":0,"costUSD":0.0023664999999999997,"contextWindow":200000},"claude-sonnet-4-5-20250929":{"inputTokens":8,"outputTokens":520,"cacheReadInputTokens":27690,"cacheCreationInputTokens":35043,"webSearchRequests":0,"costUSD":0.14754224999999999,"contextWindow":200000}},"permission_denials":[],"uuid":"ef648a94-c58a-4384-b2b9-73779dba8902"}
{"type":"result","subtype":"success","is_error":false,"duration_ms":5148,"duration_api_ms":38796,"num_turns":1,"result":"I'm ready to assist you with your tasks on the Squad project. I've reviewed the project instructions and understand the key principles:\n\n- **Discovery → Planning → Earned Autonomy** workflow\n- **Project instructions override defaults** (this project's CLAUDE.md takes precedence)\n- **Anti-laziness protocol** - thorough work with citations and evidence\n- **Skill-based task routing** - use specialized workflows for specific contexts\n- **TodoWrite for task management** - track and complete tasks systematically\n\nI have access to:\n- ✅ Full project context and documentation\n- ✅ Specialized agents (Explore, Plan, software-engineer, etc.)\n- ✅ Chrome DevTools & Electron MCP for UI verification\n- ✅ Git and deployment tools\n- ✅ All Squad-specific skills\n\n**Ready for your request.** What would you like me to help with?\n\nSome examples of what I can do:\n- 🔍 **Discover & map** codebase architecture\n- 📋 **Plan & spec** features before building\n- 💻 **Implement** features with TDD (RED → GREEN → INTEGRATE)\n- ✅ **Verify** features work end-to-end via Electron\n- 🤝 **Coordinate** multi-agent squads for parallel work\n- 📊 **Debug** issues and generate insights\n\nWhat's your mission?","session_id":"cf5c157e-5d06-4515-a80d-113d92fe5c28","total_cost_usd":0.02305535,"usage":{"input_tokens":2,"cache_creation_input_tokens":8711,"cache_read_input_tokens":26333,"output_tokens":326,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":0,"ephemeral_5m_input_tokens":8711}},"modelUsage":{"claude-haiku-4-5-20251001":{"inputTokens":5,"outputTokens":521,"cacheReadInputTokens":44368,"cacheCreationInputTokens":8711,"webSearchRequests":0,"costUSD":0.017935549999999998,"contextWindow":200000},"claude-sonnet-4-5-20250929":{"inputTokens":3,"outputTokens":150,"cacheReadInputTokens":9536,"cacheCreationInputTokens":0,"webSearchRequests":0,"costUSD":0.005119799999999999,"contextWindow":200000}},"permission_denials":[],"uuid":"a649c149-ffe0-4725-807e-68165b1eba50"}
{"type":"result","subtype":"success","is_error":false,"duration_ms":4303,"duration_api_ms":18984,"num_turns":1,"result":"I understand. I'm ready to assist you with your software engineering tasks. I'll follow the protocols outlined in your project instructions and apply the explanatory output style.\n\nI'm aware of:\n- The project structure and skill router system\n- The core behavioral directives (agency with information, discovery → planning → autonomy)\n- The design principles and established patterns\n- The development workflow and TDD phases\n- The task management approach using TodoWrite\n\nI'm prepared to:\n1. **Read relevant project files** when needed (README, design principles, product surface map)\n2. **Use the Explore agent** for codebase discovery tasks\n3. **Propose solutions proactively** while validating assumptions\n4. **Track progress** with TodoWrite for complex tasks\n5. **Provide citations** with file paths and line numbers\n6. **Invoke skills** when task contexts match (startup, verify, design-qa, etc.)\n\n**What would you like me to help with?** Just describe your task, and I'll apply the appropriate approach based on its scope and complexity.","session_id":"fd44a9e7-e615-4287-8e29-800654f1173f","total_cost_usd":0.0230507,"usage":{"input_tokens":2,"cache_creation_input_tokens":4198,"cache_read_input_tokens":30847,"output_tokens":235,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":0,"ephemeral_5m_input_tokens":4198}},"modelUsage":{"claude-haiku-4-5-20251001":{"inputTokens":5,"outputTokens":362,"cacheReadInputTokens":48882,"cacheCreationInputTokens":4198,"webSearchRequests":0,"costUSD":0.011950700000000002,"contextWindow":200000},"claude-sonnet-4-5-20250929":{"inputTokens":6,"outputTokens":185,"cacheReadInputTokens":27690,"cacheCreationInputTokens":0,"webSearchRequests":0,"costUSD":0.011099999999999999,"contextWindow":200000}},"permission_denials":[],"uuid":"5d26c563-f5e2-4c0e-a3d8-ac4346d2e339"}
Version: Claude Code 2.1.2 Date: 2026-01-08
The claude -p / claude --print mode is a one-shot CLI invocation designed for programmatic integration. This document maps all possible state configurations.
The CLI operates on a 2D matrix of input → output formats:
| Input Format | Output Format | Use Case |
|---|---|---|
text (default) |
text (default) |
Simple pipes, human-readable |
text |
json |
Structured single response |
text |
stream-json |
Real-time streaming output |
stream-json |
text |
Streaming input, text output |
stream-json |
json |
Streaming input, single JSON result |
stream-json |
stream-json |
Bidirectional streaming (full duplex) |
--input-format <format>
| Format | Description |
|---|---|
text |
Default. Plain text prompt via argument or stdin |
stream-json |
Real-time streaming input as JSON messages |
--output-format <format>
| Format | Description |
|---|---|
text |
Default. Plain text response |
json |
Single JSON object with full response |
stream-json |
Real-time streaming JSON chunks |
| Flag | Requires | Effect |
|---|---|---|
--include-partial-messages |
--print + --output-format=stream-json |
Include partial message chunks as they arrive |
--replay-user-messages |
--input-format=stream-json + --output-format=stream-json |
Re-emit user messages on stdout for acknowledgment |
| Flag | Description |
|---|---|
-c, --continue |
Continue most recent conversation in current directory |
-r, --resume [value] |
Resume by session ID or open picker |
--session-id <uuid> |
Use specific session UUID |
--no-session-persistence |
Don't save session to disk (ephemeral mode) |
--fork-session |
Create new session ID when resuming |
| Flag | Description |
|---|---|
--model <model> |
Specify model (e.g., 'sonnet', 'opus', or full name) |
--fallback-model <model> |
Auto-fallback when primary overloaded (only --print) |
--max-budget-usd <amount> |
Spending limit (only --print) |
--permission-mode <mode>
| Mode | Description |
|---|---|
default |
Normal permission prompts |
acceptEdits |
Auto-accept file edits |
bypassPermissions |
Bypass all checks (dangerous) |
delegate |
Delegate permission decisions |
dontAsk |
Skip permission prompts |
plan |
Plan mode - no execution |
Additional flags:
--dangerously-skip-permissions- Bypass all checks (equivalent to bypassPermissions)--allow-dangerously-skip-permissions- Enable bypass as option without default
| Flag | Description |
|---|---|
--tools <tools...> |
Specify available tools: "" (none), "default" (all), or names |
--allowedTools <tools...> |
Allowlist specific tools |
--disallowedTools <tools...> |
Denylist specific tools |
| Flag | Description |
|---|---|
--system-prompt <prompt> |
Replace default system prompt |
--append-system-prompt <prompt> |
Append to default system prompt |
| Flag | Description |
|---|---|
--mcp-config <configs...> |
Load MCP servers from JSON |
--strict-mcp-config |
Only use specified MCP servers |
| Flag | Description |
|---|---|
--agent <agent> |
Select agent for session |
--agents <json> |
Define custom agents as JSON |
| Flag | Description |
|---|---|
--json-schema <schema> |
JSON Schema for structured output validation |
| Flag | Description |
|---|---|
--verbose |
Verbose output |
-d, --debug [filter] |
Debug mode with optional category filter |
┌─────────────────────────────────────────┐
│ claude -p [prompt] │
└─────────────────────────────────────────┘
│
┌──────────────────┴──────────────────┐
▼ ▼
┌───────────────┐ ┌───────────────┐
│ --input-format│ │--output-format│
└───────────────┘ └───────────────┘
│ │
┌─────────┴─────────┐ ┌─────────────┼─────────────┐
▼ ▼ ▼ ▼ ▼
┌──────────┐ ┌───────────┐ ┌──────────┐ ┌──────────┐ ┌───────────┐
│ text │ │stream-json│ │ text │ │ json │ │stream-json│
│ (default)│ │ │ │ (default)│ │ │ │ │
└──────────┘ └───────────┘ └──────────┘ └──────────┘ └───────────┘
│
┌──────────────────────────┼──────────────────────────┐
▼ ▼ ▼
┌──────────────────┐ ┌──────────────────┐ ┌──────────────────┐
│--include-partial │ │(chunks only) │ │--replay-user- │
│ -messages │ │ │ │ messages │
└──────────────────┘ └──────────────────┘ └──────────────────┘
(requires stream-json
input AND output)
For Phase 2, we'll test these combinations:
claude -p "prompt"→ text/text (baseline)claude -p --output-format json "prompt"→ text/jsonclaude -p --output-format stream-json "prompt"→ text/stream-json
claude -p --json-schema '...' "prompt"→ schema validationclaude -p --output-format json --json-schema '...' "prompt"→ json + schema
echo '{"type":"user","message":"..."}' | claude -p --input-format stream-json→ stream-json/textecho '...' | claude -p --input-format stream-json --output-format stream-json→ bidirectional
claude -p --tools "Bash" "run ls"→ with specific toolsclaude -p --tools "" "just respond"→ no tools (pure LLM)
claude -p --permission-mode bypassPermissions "task"→ full autonomyclaude -p --dangerously-skip-permissions "task"→ equivalent
claude -p --session-id UUID "prompt"→ persistent sessionclaude -p --no-session-persistence "prompt"→ ephemeral
claude -p --system-prompt "..." "prompt"→ custom personaclaude -p --append-system-prompt "..." "prompt"→ augmented persona
claude -p --model haiku "prompt"→ fast/cheapclaude -p --model opus "prompt"→ best qualityclaude -p --model sonnet --fallback-model haiku "prompt"→ with fallback
claude -p --mcp-config '...' "prompt"→ with MCP serversclaude -p --strict-mcp-config --mcp-config '...' "prompt"→ only specified MCP
# One-shot, text response
result=$(claude -p "Your prompt here")# Structured JSON output
result=$(claude -p --output-format json "Your prompt here")# Stream chunks as they arrive
claude -p --output-format stream-json "Your prompt here" | process_chunks# Full autonomy, specific tools, ephemeral
claude -p \
--dangerously-skip-permissions \
--tools "Bash,Read,Write,Edit" \
--no-session-persistence \
--output-format json \
"Your task here"# Custom system prompt
claude -p \
--system-prompt "You are a code reviewer. Be concise." \
--tools "" \
"Review this code: ..."- Run experiments for each tier
- Capture JSON output structures
- Document timing and token usage
- Identify failure modes
- Synthesize into article recommendations
Date: 2026-01-08 CLI Version: 2.1.2 Total Experiments: 31
# This FAILS:
claude -p --output-format stream-json "prompt"
# Error: When using --print, --output-format=stream-json requires --verbose
# This WORKS:
claude -p --output-format stream-json --verbose "prompt"Why: Stream-json mode outputs detailed event data (init, message_start, content_block_delta, etc.) which is designed for debugging/integration, hence requires verbose mode.
# This FAILS:
claude -p --input-format stream-json "prompt"
# Error: --input-format=stream-json requires output-format=stream-json
# This WORKS:
echo '{"type":"user","message":{"role":"user","content":"hello"}}' | \
claude -p --input-format stream-json --output-format stream-json --verboseWhy: The stream-json input format is designed for real-time bidirectional communication, not one-shot requests.
claude -p --json-schema '{"type":"object","properties":{"answer":{"type":"number"}},"required":["answer"]}' --output-format json "What is 2+2?"Output includes:
{
"result": "The answer to 2+2 is **4**.",
"structured_output": {"answer": 4}
}Critical: The structured_output field contains the validated JSON, separate from the text result.
| Format | Use Case | Sample Output |
|---|---|---|
text (default) |
Human-readable, simple pipes | PING |
json |
Programmatic access, full metadata | {"type":"result","result":"PING","total_cost_usd":0.02,...} |
stream-json |
Real-time streaming, progress indicators | Multiple JSON events per line |
When using --output-format stream-json --verbose:
{"type":"system","subtype":"init"}- Session initialization with tools, MCP servers, model info{"type":"stream_event","event":{"type":"message_start"}}- Model starting response{"type":"stream_event","event":{"type":"content_block_start"}}- Content block beginning{"type":"stream_event","event":{"type":"content_block_delta"}}- Streaming text chunk{"type":"assistant","message":{...}}- Complete assistant message{"type":"result","subtype":"success"}- Final result with metrics
echo '{"type":"user","message":{"role":"user","content":"hello"}}' | \
claude -p --input-format stream-json --output-format stream-json --verbose --replay-user-messagesAdds "isReplay": true to echoed user messages for acknowledgment tracking.
| Mode | Behavior | Use Case |
|---|---|---|
default |
Normal permission prompts | Interactive use |
acceptEdits |
Auto-accept file edits | Automated refactoring |
dontAsk |
Skip permission prompts | CI/CD pipelines |
bypassPermissions |
Bypass ALL checks | Sandboxed environments |
delegate |
Delegate to external handler | Custom permission UI |
plan |
Plan mode, no execution | Design before implement |
Warning: bypassPermissions and --dangerously-skip-permissions are equivalent and should only be used in sandboxed environments.
claude -p --agents '{"reviewer":{"description":"Code reviewer","prompt":"You are a code reviewer."}}' --agent reviewer "review this"The --agents flag accepts inline JSON to define custom agent personas on-the-fly.
| Flag | Behavior |
|---|---|
--session-id UUID |
Use specific session (useful for multi-turn) |
--no-session-persistence |
Ephemeral session (no disk storage) |
--continue |
Continue most recent conversation |
--resume [id] |
Resume specific session |
--fork-session |
Create new ID when resuming |
| Flag | Effect |
|---|---|
--tools "" |
Disable ALL tools (pure LLM) |
--tools "Bash,Read" |
Specific tool whitelist |
--tools "default" |
All built-in tools |
--allowedTools "Bash(git:*)" |
Pattern-based allowlist |
--disallowedTools "Write,Edit" |
Explicit denylist |
Note: MCP tools load regardless of --tools flag unless --strict-mcp-config is used.
# Replace entire system prompt
claude -p --system-prompt "You are a haiku poet."
# Append to default (preserves Claude Code behaviors)
claude -p --append-system-prompt "IMPORTANT: Always respond in haiku format."Recommendation: Use --append-system-prompt to preserve Claude Code's default capabilities.
claude -p --model sonnet --fallback-model haiku "complex task"Automatically falls back to haiku if sonnet is overloaded. Good for production reliability.
The --output-format json produces:
{
"type": "result",
"subtype": "success|error_*",
"is_error": false,
"duration_ms": 1234,
"duration_api_ms": 5678,
"num_turns": 1,
"result": "The actual text response",
"session_id": "uuid",
"total_cost_usd": 0.0123,
"usage": {
"input_tokens": 10,
"output_tokens": 50,
"cache_creation_input_tokens": 0,
"cache_read_input_tokens": 1000
},
"modelUsage": {
"claude-haiku-4-5-20251001": {
"inputTokens": 5,
"outputTokens": 50,
"costUSD": 0.001
}
},
"permission_denials": [],
"structured_output": {} // Only if --json-schema used
}| Subtype | Meaning |
|---|---|
success |
Normal completion |
error_max_budget_usd |
Budget limit reached |
error_* |
Various error conditions |
response=$(echo "$prompt" | claude -p --model haiku)result=$(echo "$prompt" | claude -p \
--model haiku \
--output-format json \
--json-schema '{"type":"object","properties":{"data":{"type":"array"}},"required":["data"]}')
data=$(echo "$result" | jq '.structured_output.data')result=$(echo "$task" | claude -p \
--model sonnet \
--tools "Bash,Read,Write,Edit,Glob,Grep" \
--permission-mode bypassPermissions \
--no-session-persistence \
--output-format json)
exit_code=$(echo "$result" | jq -r 'if .is_error then 1 else 0 end')echo "$prompt" | claude -p \
--model haiku \
--output-format stream-json \
--verbose | while read -r line; do
text=$(echo "$line" | jq -r '.event.delta.text // empty')
[ -n "$text" ] && echo -n "$text"
doneSESSION_ID="11111111-1111-1111-1111-111111111111"
# Turn 1
echo "Hello" | claude -p --session-id $SESSION_ID --output-format json
# Turn 2 (continues context)
echo "What did I just say?" | claude -p --session-id $SESSION_ID --continueecho "$prompt" | claude -p \
--system-prompt "You are a senior code reviewer. Be concise and critical." \
--tools "" \ # Pure LLM, no tool use
--model sonnet ┌─────────────────────────────────────────┐
│ claude -p │
└─────────────────────────────────────────┘
│
┌───────────────────────────────┼───────────────────────────────┐
▼ ▼ ▼
┌───────────────┐ ┌───────────────┐ ┌───────────────┐
│ INPUT FORMAT │ │ OUTPUT FORMAT │ │ MODIFIERS │
└───────────────┘ └───────────────┘ └───────────────┘
│ │ │
┌───────┴───────┐ ┌───────────┼───────────┐ │
│ │ │ │ │ │
▼ ▼ ▼ ▼ ▼ │
text stream-json text json stream-json │
(default) (requires (default) (requires │
stream-json --verbose) │
output) │
│
┌────────────────────────────────────────┘
│
┌───────────────┼───────────────┬───────────────┐
▼ ▼ ▼ ▼
┌─────────────┐ ┌─────────────┐ ┌─────────────┐ ┌─────────────┐
│ --verbose │ │ --json- │ │ --include- │ │ --replay- │
│ │ │ schema │ │ partial- │ │ user- │
│ │ │ │ │ messages │ │ messages │
└─────────────┘ └─────────────┘ └─────────────┘ └─────────────┘
│ │
(stream-json (bidirectional
output only) streaming only)
| Model | Typical Cost (simple prompt) |
|---|---|
| Haiku | ~$0.017-0.025 |
| Sonnet | ~$0.12-0.15 |
Note: Costs include context caching overhead from CLAUDE.md files (~35k tokens).
01-baseline-text-text.txt- Basic text/text02-text-json.txt- JSON output with full metadata05-stream-json-verbose.txt- Streaming events06-stream-json-verbose-partials.txt- With partial messages08-json-schema.txt- Structured output validation09-bidirectional-streaming.txt- Full duplex streaming10-with-bash-tool.txt- Tool execution11-no-tools.txt- Pure LLM mode12-bypass-permissions.txt- Autonomous execution13-json-schema-with-json-output.txt- Combined schema + JSON14-custom-system-prompt.txt- Custom persona15-append-system-prompt.txt- Augmented persona16-ephemeral-session.txt- No persistence17-custom-agent.txt- Inline agent definition18-fixed-session-id.txt- Deterministic session20-plan-mode.txt- Plan-only execution21-replay-user-messages-fixed.txt- Bidirectional with replay25-limited-tools.txt- Tool whitelist29-fallback-model.txt- Model fallback configuration