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claude_agent_sdk

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An Elixir SDK for Claude Code - provides programmatic access to Claude Code CLI with streaming message processing

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# Claude Agent SDK for Elixir

An Elixir SDK aiming for high parity with the official [claude-agent-sdk-python](https://github.com/anthropics/claude-agent-sdk-python) while treating the [Claude Code CLI](https://code.claude.com/docs/en/cli-reference) as the authoritative runtime contract. Build AI-powered applications with Claude using a production-ready interface for the Claude Code CLI, featuring streaming responses, lifecycle hooks, permission controls, and in-process tool execution via MCP.

> **Note:** This SDK does not bundle the Claude Code CLI. You must install it separately (see [Prerequisites](#prerequisites)).

## Documentation Menu

- `README.md` - installation, quick start, and ownership boundaries
- `guides/getting-started.md` - first query and streaming flows
- `guides/configuration.md` - runtime config and defaults
- `guides/model-configuration.md` - Claude model selection and effort controls
- `guides/agents.md` - agent and orchestration patterns
- `guides/testing.md` - local validation workflow
- `guides/provider_behavior_manifest.md` - evidence for Claude-native feature
  translation

---

## What You Can Build

- **AI coding assistants** with real-time streaming output
- **Automated code review** pipelines with custom permission policies
- **Multi-agent workflows** with specialized personas
- **Tool-augmented applications** using the Model Context Protocol (MCP)
- **Interactive chat interfaces** with typewriter-style output

---

## Runtime Architecture

- Common CLI query/streaming flows run on the shared `cli_subprocess_core`
  runtime: `CliSubprocessCore.Session`, `CliSubprocessCore.RawSession`, and
  `CliSubprocessCore.Command`.
- `ClaudeAgentSDK.Client` remains SDK-local only for the advanced Claude
  control family: hooks, permission callbacks, SDK MCP routing, and control
  request/response state.
- `ClaudeAgentSDK.Client` now runs its control lane through
  `CliSubprocessCore.ProtocolSession`; custom transport injection has been
  removed. Use `Options.execution_surface` for SSH/local routing.

## ASM Boundary

If you enter Claude through `agent_session_manager`, the normalized ASM kernel
still stops at provider selection, lane selection, event projection, and
session/run orchestration.

The optional ASM seam for Claude lives under
`ASM.Extensions.ProviderSDK.Claude`. That extension may:

- derive `ClaudeAgentSDK.Options` from ASM-style config
- start `ClaudeAgentSDK.Client` from ASM session defaults or ASM-style config

If `claude_agent_sdk` is present in the dependency graph, ASM activates that
namespace automatically in `ASM.Extensions.ProviderSDK.available_extensions/0`
and `ASM.Extensions.ProviderSDK.capability_report/0`. Client apps do not need
to register it manually.

Common fields such as `cwd`, `model`, `max_turns`, and transport timeouts may
be derived from ASM config. Claude-native controls such as permission modes,
hooks, MCP, settings, agents, tool lists, and system prompt channels must stay
in this SDK or be passed through an explicit Claude-native override bag.

It does not move the control family into ASM. Once you cross that seam, the
real control APIs remain here:

- `ClaudeAgentSDK.Client.set_permission_mode/2`
- `ClaudeAgentSDK.Client.set_model/2`
- `ClaudeAgentSDK.Client.interrupt/1`
- `ClaudeAgentSDK.Client.rewind_files/2`
- `ClaudeAgentSDK.ControlProtocol.Protocol`

SDK-direct live verification lives in
`examples/promotion_path/sdk_direct_claude.exs`. It uses the Claude SDK API
without importing ASM, passes keyword `execution_surface` input, and
demonstrates Claude-native tool suppression as SDK-owned behavior:

```bash
mix run examples/promotion_path/sdk_direct_claude.exs \
  --model haiku \
  --prompt "Reply with exactly: claude sdk direct ok"
```

Provider-native feature evidence is tracked in
`guides/provider_behavior_manifest.md`. Add or update that manifest before
translating any new Claude-specific CLI flag, control-client behavior, hook,
MCP, permission, or settings feature.

## Packaging Boundary

Phase 4 finalizes the Claude release boundary:

- `cli_subprocess_core` remains the required lower dependency for the common
  Claude query and streaming lane
- `claude_agent_sdk` remains the source of truth for Claude-native control
  features such as hooks, permission callbacks, SDK MCP routing, and control
  protocol state
- ASM may bridge into that richer family only through
  `ASM.Extensions.ProviderSDK.Claude`; that seam does not move the control
  family into ASM or the shared core
- the operator publication order is the two Ground Plane leaves, Execution
  Plane 0.1.0 components, `cli_subprocess_core` 0.4.1,
  `claude_agent_sdk` 0.19.1, then
  `agent_session_manager`; this SDK does not import Execution Plane directly

## Schema Boundary

`Zoi` is now the canonical boundary-schema layer for new dynamic boundary work
inside `claude_agent_sdk`.

- `cli_subprocess_core` owns the shared common-lane event and payload shapes.
- `claude_agent_sdk` owns Claude-local control-protocol envelopes, permission
  update payloads, and Claude-native message-frame adaptation.
- public structs such as `%ClaudeAgentSDK.Message{}`,
  `%ClaudeAgentSDK.Permission.Update{}`, and
  `%ClaudeAgentSDK.Permission.RuleValue{}` remain the ergonomic caller-facing
  layer.
- forward-compatible wire surfaces use `Zoi.map(..., unrecognized_keys: :preserve)`
  plus projection instead of direct `Zoi.struct/3`.
- closed local payloads still use schema validation, but unknown-field
  preservation is only enabled where the wire surface can legitimately expand.

## Centralized Model Selection

`claude_agent_sdk` no longer owns active model defaulting or fallback policy.
That authority lives in `cli_subprocess_core`.

Authoritative core surface:

- `CliSubprocessCore.ModelRegistry.resolve/3`
- `CliSubprocessCore.ModelRegistry.validate/2`
- `CliSubprocessCore.ModelRegistry.default_model/2`
- `CliSubprocessCore.ModelRegistry.build_arg_payload/3`
- `CliSubprocessCore.ModelInput.normalize/3`

Claude-side behavior:

- `ClaudeAgentSDK.Options.new/1` routes mixed raw-versus-payload input through
  `CliSubprocessCore.ModelInput.normalize/3`, then ensures `model_payload` and
  `model` are aligned from the shared core contract
- `ClaudeAgentSDK.Model.default_model/0` reads the shared core default instead
  of carrying a local fallback
- effort gating runs against the resolved model, not mutable app config
- provider CLI rendering only formats arguments from resolved values
- repo-local env defaults remain fallback inputs only when `model_payload` was
  not supplied explicitly

Do not treat repo-local config snapshots as authoritative model policy. The
shared core registry is the source of truth.

### Claude Ollama Backend

`claude_agent_sdk` now supports an explicit Claude `:ollama` backend through
the same core-owned payload path.

Example:

```elixir
options =
  ClaudeAgentSDK.Options.new(
    provider_backend: :ollama,
    anthropic_base_url: "http://localhost:11434",
    external_model_overrides: %{"haiku" => "llama3.2"},
    model: "haiku"
  )
```

The SDK still runs the normal `claude` binary. The core payload resolves the
actual transport model and injects the Anthropic-compatible Ollama env.

---

## Installation

Claude Agent SDK 0.19 requires Elixir 1.19 or later.

Add to your `mix.exs`:

```elixir
def deps do
  [
    {:claude_agent_sdk, "~> 0.19.1"}
  ]
end
```

Then fetch dependencies:

```bash
mix deps.get
```

### Prerequisites

Install the Claude Code CLI (requires Node.js):

```bash
npm install -g @anthropic-ai/claude-code
```

Verify installation:

```bash
claude --version
```

### CLI Compatibility

- Minimum supported Claude CLI version: `2.1.0`
- Recommended Claude CLI version: `2.1.207`
- Parity baseline: Python SDK `v0.2.116` / TypeScript SDK `v0.3.207` (CLI `2.1.207`), including the `2.1.203–2.1.207` protocol frames — `terminal_reason` (`Message.dead_turn?/1`), `background_tasks_changed` (`Message.live_background_tasks/1`), `command_lifecycle` (`Message.command_terminal?/1`), typed interrupt receipts with `still_queued`, `system/init` capabilities (`Message.capability?/2`), peer-message `origin` (`Message.peer_origin/1`), and `AgentToolCompletedOutput` (`Message.agent_tool_completed/1`).
- Compatibility policy: this SDK follows the Python SDK where practical, but the Claude CLI wire protocol is authoritative. CLI-native frames such as `:rate_limit_event` are surfaced here even if the current Python SDK skips unknown message types for forward compatibility.

---

## Quick Start

### 1. Authenticate

Choose one method:

```bash
# Option A: Environment variable (recommended for CI/CD)
export ANTHROPIC_API_KEY="sk-ant-api03-..."

# Option B: OAuth token
export CLAUDE_AGENT_OAUTH_TOKEN="sk-ant-oat01-..."

# Option C: Interactive login
claude login
```

### 2. Run Your First Query

```elixir
alias ClaudeAgentSDK.{ContentExtractor, Options}

# Simple query with streaming collection
ClaudeAgentSDK.query("Write a function that calculates factorial in Elixir")
|> Enum.each(fn msg ->
  case msg.type do
    :assistant -> IO.puts(ContentExtractor.extract_text(msg) || "")
    :result -> IO.puts("Done! Cost: $#{msg.data.total_cost_usd}")
    _ -> :ok
  end
end)
```

### 3. Real-Time Streaming

```elixir
alias ClaudeAgentSDK.Streaming

{:ok, session} = Streaming.start_session()

Streaming.send_message(session, "Explain GenServers in one paragraph")
|> Stream.each(fn
  %{type: :text_delta, text: chunk} -> IO.write(chunk)
  %{type: :message_stop} -> IO.puts("")
  _ -> :ok
end)
|> Stream.run()

Streaming.close_session(session)
```

If session initialization or message send fails, the stream now emits an immediate
`%{type: :error, error: reason}` event instead of waiting for the 5-minute stream timeout.

---

## Authentication

The SDK supports three authentication methods, checked in this order:

| Method | Environment Variable | Best For |
|--------|---------------------|----------|
| OAuth Token | `CLAUDE_AGENT_OAUTH_TOKEN` | Production / CI |
| API Key | `ANTHROPIC_API_KEY` | Development |
| CLI Login | (uses `claude login` session) | Local development |

These methods are standalone compatibility paths for direct SDK use. Governed
launch callers must pass `Options.governed_authority` with the materialized
command, cwd, environment, auth/config roots, target reference, credential
lease reference, command reference, and redaction reference. In governed mode,
ambient env values, native login state, provider backend overrides, token-store
defaults, and explicit CLI paths are rejected instead of being used as fallback
authentication.

`AuthManager.get_token/1` does not project raw credentials for governed
authority. It reports `{:error, :governed_token_unavailable}` so upper layers
carry only authority and lease references.

### Cloud Providers

**AWS Bedrock:**
```bash
export CLAUDE_AGENT_USE_BEDROCK=1
export AWS_ACCESS_KEY_ID=...
export AWS_SECRET_ACCESS_KEY=...
export AWS_REGION=us-west-2
```

**Google Vertex AI:**
```bash
export CLAUDE_AGENT_USE_VERTEX=1
export GOOGLE_APPLICATION_CREDENTIALS=/path/to/key.json
export GOOGLE_CLOUD_PROJECT=your-project-id
```

### Token Setup (Local Development)

For persistent authentication without re-login:

```bash
mix claude.setup_token
```

`AuthManager` keeps running if token storage save/clear fails and returns `{:error, reason}`.
Handle `clear_auth/0` accordingly in your app code:

```elixir
case ClaudeAgentSDK.AuthManager.clear_auth() do
  :ok -> :ok
  {:error, reason} -> IO.puts("Failed to clear auth: #{inspect(reason)}")
end
```

Check authentication status:

```elixir
alias ClaudeAgentSDK.AuthChecker
diagnosis = AuthChecker.diagnose()
# => %{authenticated: true, auth_method: "Anthropic API", ...}
```

---

## Core Concepts

### Choosing the Right API

| API | Use Case | When to Use |
|-----|----------|-------------|
| `query/2` | Simple queries | Batch processing, scripts |
| `Streaming` | Typewriter UX | Chat interfaces, real-time output |
| `Client` | Full control | Multi-turn agents, tools, hooks |

### Query API

The simplest way to interact with Claude:

```elixir
# Basic query
messages = ClaudeAgentSDK.query("What is recursion?") |> Enum.to_list()

# With options
opts = %ClaudeAgentSDK.Options{
  model: "sonnet",
  max_turns: 5,
  output_format: :stream_json
}
messages = ClaudeAgentSDK.query("Explain OTP", opts) |> Enum.to_list()

# Streamed input prompts (unidirectional)
prompts = [
  %{"type" => "user", "message" => %{"role" => "user", "content" => "Hello"}},
  %{"type" => "user", "message" => %{"role" => "user", "content" => "How are you?"}}
]

ClaudeAgentSDK.query(prompts, opts) |> Enum.to_list()

# Execution-surface routing
opts = %ClaudeAgentSDK.Options{
  execution_surface: [
    surface_kind: :ssh_exec,
    transport_options: [
      destination: "claude.example",
      ssh_user: "sdk",
      port: 22
    ]
  ]
}

ClaudeAgentSDK.query("Hello", opts) |> Enum.to_list()

# Continue a conversation
ClaudeAgentSDK.continue("Can you give an example?") |> Enum.to_list()

# Resume a specific session
ClaudeAgentSDK.resume("session-id", "What about supervision trees?") |> Enum.to_list()
```

### Streaming API

For real-time, character-by-character output:

```elixir
alias ClaudeAgentSDK.{Options, Streaming}

{:ok, session} = Streaming.start_session(%Options{model: "haiku"})

# Send messages and stream responses
Streaming.send_message(session, "Write a haiku about Elixir")
|> Enum.each(fn
  %{type: :text_delta, text: t} -> IO.write(t)
  %{type: :tool_use_start, name: n} -> IO.puts("\nUsing tool: #{n}")
  %{type: :message_stop} -> IO.puts("\n---")
  _ -> :ok
end)

# Multi-turn conversation (context preserved)
Streaming.send_message(session, "Now write one about Phoenix")
|> Enum.to_list()

Streaming.close_session(session)
```

**Subagent Streaming:** When Claude spawns subagents via the Agent tool, events include a `parent_tool_use_id` field to identify the source. Main agent events have `nil`, subagent events have the Agent tool call ID. Streaming events also preserve `uuid`, `session_id`, and `raw_event` metadata when the CLI provides them. See the [Streaming Guide](guides/streaming.md#subagent-events-parent_tool_use_id) for details.

### Hooks System

Intercept and control agent behavior at key lifecycle points:

```elixir
alias ClaudeAgentSDK.{Client, Options}
alias ClaudeAgentSDK.Hooks.{Matcher, Output}

# Block dangerous commands
check_bash = fn input, _id, _ctx ->
  case input do
    %{"tool_name" => "Bash", "tool_input" => %{"command" => cmd}} ->
      if String.contains?(cmd, "rm -rf") do
        Output.deny("Dangerous command blocked")
      else
        Output.allow()
      end
    _ -> %{}
  end
end

opts = %Options{
  hooks: %{
    pre_tool_use: [Matcher.new("Bash", [check_bash])]
  }
}

{:ok, client} = Client.start_link(opts)
```

**Available Hook Events (all 12 Python SDK events supported):**
- `pre_tool_use` / `post_tool_use` / `post_tool_use_failure` - Tool execution lifecycle
- `user_prompt_submit` - Before sending user messages
- `stop` / `subagent_stop` / `subagent_start` - Agent lifecycle
- `notification` - CLI notifications
- `permission_request` - Permission dialog interception
- `session_start` / `session_end` - Session lifecycle
- `pre_compact` - Before context compaction

See the [Hooks Guide](guides/hooks.md) for comprehensive documentation.

### Supervision

Hook and permission callbacks run in async tasks. For production, add the SDK
task supervisor so callback processes are supervised:

```elixir
children = [
  ClaudeAgentSDK.TaskSupervisor,
  {ClaudeAgentSDK.Client, options}
]
```

If you use a custom supervisor name, configure the SDK to match:

```elixir
children = [
  {ClaudeAgentSDK.TaskSupervisor, name: MyApp.ClaudeTaskSupervisor}
]

config :claude_agent_sdk, task_supervisor: MyApp.ClaudeTaskSupervisor
```

If an explicitly configured supervisor is missing at runtime, the SDK logs a warning and
falls back to `Task.start/1`. With default settings, missing
`ClaudeAgentSDK.TaskSupervisor` falls back silently for backward compatibility.
For stricter behavior in dev/test:

```elixir
config :claude_agent_sdk, task_supervisor_strict: true
```

In strict mode, `ClaudeAgentSDK.TaskSupervisor.start_child/2` returns
`{:error, {:task_supervisor_unavailable, supervisor}}` instead of spawning
an unsupervised fallback task.

### Permission System

Fine-grained control over tool execution:

```elixir
alias ClaudeAgentSDK.{Options, Permission.Result}

permission_callback = fn ctx ->
  case ctx.tool_name do
    "Write" ->
      # Redirect system file writes to safe location
      if String.starts_with?(ctx.tool_input["file_path"], "/etc/") do
        safe_path = "/tmp/sandbox/" <> Path.basename(ctx.tool_input["file_path"])
        Result.allow(updated_input: %{ctx.tool_input | "file_path" => safe_path})
      else
        Result.allow()
      end
    _ ->
      Result.allow()
  end
end

opts = %Options{
  can_use_tool: permission_callback,
  permission_mode: :default  # :default | :accept_edits | :plan | :bypass_permissions | :auto | :dont_ask
}
```

Note: `can_use_tool` is mutually exclusive with `permission_prompt_tool`. The SDK routes `can_use_tool` through the control client (including string prompts), auto-enables `include_partial_messages`, and sets `permission_prompt_tool` to `\"stdio\"` internally so the CLI can emit permission callbacks. Use `:default`, `:plan`, or the CLI's `:auto` mode for built-in tool permissions. Hook-based fallback only applies when the CLI does not emit `can_use_tool`, and that fallback ignores `updated_permissions`. `:delegate` is no longer forwarded because current Claude CLI builds reject it.

CLI transcript history now matches the official SDK surface:

```elixir
# Claude CLI transcript history
sessions = ClaudeAgentSDK.list_sessions(directory: "/path/to/project")
messages = ClaudeAgentSDK.get_session_messages("550e8400-e29b-41d4-a716-446655440000",
  directory: "/path/to/project"
)

# SDK-managed SessionStore history
{:ok, saved_sessions} = ClaudeAgentSDK.list_saved_sessions(storage_dir: "/custom/path")

# Official SessionStore adapter surface
store = ClaudeAgentSDK.SessionStore.InMemory.new!()
session_id = "550e8400-e29b-41d4-a716-446655440000"
project_key = ClaudeAgentSDK.project_key_for_directory("/path/to/project")

:ok =
  ClaudeAgentSDK.SessionStore.Adapter.append(store, %{project_key: project_key, session_id: session_id}, [
    %{"type" => "user", "uuid" => "u1", "sessionId" => session_id, "message" => %{"content" => "hello"}}
  ])

sessions = ClaudeAgentSDK.list_sessions_from_store(store, directory: "/path/to/project")
messages = ClaudeAgentSDK.get_session_messages_from_store(session_id, store,
  directory: "/path/to/project"
)
```

Stream a single client response until the final result:

```elixir
Client.receive_response_stream(client)
|> Enum.to_list()
```

### MCP Tools (In-Process)

Define custom tools that Claude can call directly in your application:

```elixir
defmodule MyTools do
  use ClaudeAgentSDK.Tool

deftool :calculate, "Perform a calculation", %{
    type: "object",
    properties: %{
      expression: %{type: "string", description: "Math expression to evaluate"}
    },
    required: ["expression"]
  } do
    def execute(%{"expression" => expr}) do
      # Your logic here
      result = eval_expression(expr)
      {:ok, %{"content" => [%{"type" => "text", "text" => "Result: #{result}"}]}}
    end
  end
end

# Create an MCP server with your tools
server = ClaudeAgentSDK.create_sdk_mcp_server(
  name: "calculator",
  version: "1.0.0",
  tools: [MyTools.Calculate]
)

# Without :supervisor, the SDK keeps the registry under its internal
# SDK MCP supervisor so the server survives creator process exits.

# Optional: start tool registry under your DynamicSupervisor
{:ok, sup} = DynamicSupervisor.start_link(strategy: :one_for_one)

server = ClaudeAgentSDK.create_sdk_mcp_server(
  name: "calculator",
  version: "1.0.0",
  tools: [MyTools.Calculate],
  supervisor: sup
)

opts = %ClaudeAgentSDK.Options{
  mcp_servers: %{"calc" => server},
  allowed_tools: ["mcp__calc__calculate"]
}
```

Note: MCP server routing only supports `initialize`, `tools/list`, `tools/call`, and `notifications/initialized`. Calls to `resources/list` or `prompts/list` return JSON-RPC method-not-found errors to match the Python SDK.
If `version` is omitted, it defaults to `"1.0.0"`.

---

## Configuration Options

Key options for `ClaudeAgentSDK.Options`:

| Option | Type | Description |
|--------|------|-------------|
| `model` | string | `"sonnet"` (default/recommended, Sonnet 5), `"sonnet[1m]"`, `"opus"` (Opus 5), `"opus[1m]"` (compatibility alias for Opus 5, itself a 1M-context model), `"fable"` (Fable 5), `"haiku"` (Haiku 4.5), or any custom model id (see `guides/model-configuration.md`) |
| `effort` | atom | `:low`, `:medium`, `:high`, `:xhigh`, `:max` — controls reasoning effort; `:xhigh` is Opus-only; invalid values raise `ArgumentError` (not supported for Haiku) |
| `thinking` | map | `%{type: :adaptive}`, `%{type: :enabled, budget_tokens: N}`, `%{type: :disabled}` |
| `skills` | `:all` / list | Enables Claude skills and defaults setting sources to user/project when set |
| `task_budget` | map | `%{total: n}` passed as an SDK task budget |
| `session_store` | adapter | Mirrors transcript frames through the SessionStore adapter contract |
| `load_timeout_ms` | integer | Bound for SessionStore resume materialization loads |
| `max_turns` | integer | Maximum conversation turns |
| `system_prompt` | string/map | Custom text, `%{type: :file, path: path}`, or preset maps with dynamic-section exclusion |
| `output_format` | atom/map | `:text`, `:json`, `:stream_json`, or JSON schema (SDK enforces stream-json for transport; JSON schema still passed) |
| `allowed_tools` | list | Tools Claude can use |
| `permission_mode` | atom | `:default`, `:accept_edits`, `:plan`, `:bypass_permissions`, `:auto`, `:dont_ask` |
| `hooks` | map | Lifecycle hook callbacks |
| `mcp_servers` | map or string | MCP server configurations (or JSON/path alias for `mcp_config`) |
| `cwd` | string | Working directory for file operations |
| `timeout_ms` | integer | Command timeout (default: 75 minutes) |
| `transport_error_mode` | atom | `:result` (default) or `:raise` for strict transport/decode failures |
| `max_buffer_size` | integer | Maximum JSON buffer size (default: 1MB, overflow yields `CLIJSONDecodeError`) |

CLI path override: set `path_to_claude_code_executable` or `executable` in `Options` (Python `cli_path` equivalent).

On SSH-backed `execution_surface` values, Claude is resolved on the remote host.
If the binary is installed outside the remote non-login `PATH`, pass an
explicit `executable` or `path_to_claude_code_executable` for that target.

### Runtime Application Config

All tunable constants (timeouts, buffer sizes, auth paths, CLI flags, env var
names, concurrency limits) are centralized in `Config.*` sub-modules and can
be overridden per-environment:

```elixir
# config/config.exs
config :claude_agent_sdk, ClaudeAgentSDK.Config.Timeouts,
  query_total_ms: 5_400_000,           # total query timeout (default: 75 min)
  tool_execution_ms: 60_000            # per-tool timeout (default: 30 s)

config :claude_agent_sdk, ClaudeAgentSDK.Config.Buffers,
  max_stdout_buffer_bytes: 2_097_152   # stdout buffer (default: 1 MB)

config :claude_agent_sdk, ClaudeAgentSDK.Config.Orchestration,
  max_concurrent: 10,                  # parallel query limit (default: 5)
  max_retries: 5                       # retry attempts (default: 3)

# Legacy flat keys still work:
config :claude_agent_sdk,
  cli_stream_module: ClaudeAgentSDK.Query.CLIStream,
  task_supervisor_strict: false
```

See the [Configuration Internals](guides/configuration-internals.md) guide for
the complete reference of every tunable, its default, and override examples.

`config :claude_agent_sdk, :process_module` is still read as a fallback for query streaming,
but it is deprecated and logs a warning once per legacy module.

`SessionStore` now hydrates on-disk cache in a `handle_continue/2` step. Startup is faster,
but `list/search` can be briefly incomplete immediately after boot while warmup finishes.

`CliSubprocessCore.RawSession` and `Streaming.Session` support `startup_mode: :lazy`
to defer subprocess startup to `handle_continue/2`. Deterministic startup
validation still happens before `start_link` returns, so missing cwd/command
style failures surface immediately. Once preflight passes, lazy mode can still
surface subprocess launch failures as a process exit after init.

Query-side transport errors normalize equivalent reasons to stable atoms where possible:
`{:command_not_found, "claude"}` is treated as `:cli_not_found`.

### SDK Logging

The SDK uses its own log level filter (default: `:warning`) to keep output quiet in dev. Configure via application env:

```elixir
config :claude_agent_sdk, log_level: :warning  # :debug | :info | :warning | :error | :off
```

### Option Presets

```elixir
alias ClaudeAgentSDK.OptionBuilder

# Environment-based presets
OptionBuilder.build_development_options()  # Permissive, verbose
OptionBuilder.build_production_options()   # Restrictive, safe
OptionBuilder.for_environment()            # Auto-detect from Mix.env()

# Use-case presets
OptionBuilder.build_analysis_options()     # Read-only code analysis
OptionBuilder.build_chat_options()         # Simple chat, no tools
OptionBuilder.quick()                      # Fast one-off queries

# Effort and thinking helpers
OptionBuilder.with_opus()
|> OptionBuilder.with_effort(:max)
|> OptionBuilder.with_thinking(%{type: :adaptive})
```

---

## Examples

The `examples/` directory contains runnable demonstrations.

### Mix Task Example (Start Here)

If you want to integrate Claude into your own Mix project, see the **[mix_task_chat](examples/mix_task_chat/README.md)** example — a complete working app with Mix tasks:

```bash
cd examples/mix_task_chat
mix deps.get
mix chat "Hello, Claude!"           # Streaming response
mix chat --interactive              # Multi-turn conversation
mix ask -q "What is 2+2?"           # Script-friendly output
```

### Script Examples

```bash
# Run all examples
bash examples/run_all.sh

# Run a specific example
mix run examples/basic_example.exs
mix run examples/streaming_tools/quick_demo.exs
mix run examples/hooks/basic_bash_blocking.exs
```

**Key Examples:**
- [`mix_task_chat/`](examples/mix_task_chat/README.md) - **Full Mix task integration** (streaming + interactive chat)
- `basic_example.exs` - Minimal SDK usage
- `streaming_tools/quick_demo.exs` - Real-time streaming
- `hooks/complete_workflow.exs` - Full hooks integration
- `sdk_mcp_tools_live.exs` - Custom MCP tools
- `max_effort_opus_live.exs` - Opus `:max` effort (not in `run_all.sh`)
- `advanced_features/agents_live.exs` - Multi-agent workflows
- `advanced_features/subagent_spawning_live.exs` - Parallel subagent coordination
- `advanced_features/web_tools_live.exs` - WebSearch and WebFetch

### Full Application Examples

Complete Mix applications demonstrating production-ready SDK integration patterns:

| Example | Description | Key Features |
|---------|-------------|--------------|
| [`phoenix_chat/`](examples/phoenix_chat/README.md) | Real-time chat with Phoenix LiveView | LiveView, Channels, streaming responses, session management |
| [`document_generation/`](examples/document_generation/README.md) | AI-powered Excel document generation | elixlsx, natural language parsing, Mix tasks |
| [`research_agent/`](examples/research_agent/README.md) | Multi-agent research coordination | Agent tool, subagent tracking via hooks, parallel execution |
| [`skill_invocation/`](examples/skill_invocation/README.md) | Skill tool usage and tracking | Skill definitions, hook-based tracking, GenServer state |
| [`email_agent/`](examples/email_agent/README.md) | AI-powered email assistant | SQLite storage, rule-based processing, natural language queries |

```bash
# Run Phoenix Chat
cd examples/phoenix_chat && mix deps.get && mix phx.server
# Visit http://localhost:4000

# Run Document Generation
cd examples/document_generation && mix deps.get && mix generate.demo

# Run Research Agent
cd examples/research_agent && mix deps.get && mix research "quantum computing"

# Run Skill Invocation demo
cd examples/skill_invocation && mix deps.get && mix run -e "SkillInvocation.demo()"

# Run Email Agent
cd examples/email_agent && mix deps.get && mix email.assistant "find emails from last week"
```

---

## Guides

| Guide | Description |
|-------|-------------|
| [Getting Started](guides/getting-started.md) | Installation, authentication, and first query |
| [Streaming](guides/streaming.md) | Real-time streaming and typewriter effects |
| [Hooks](guides/hooks.md) | Lifecycle hooks for tool control |
| [MCP Tools](guides/mcp-tools.md) | In-process tool definitions with MCP |
| [Permissions](guides/permissions.md) | Fine-grained permission controls |
| [Configuration](guides/configuration.md) | Complete options reference |
| [Agents](guides/agents.md) | Custom agent personas |
| [Sessions](guides/sessions.md) | Session management and persistence |
| [Runtime Control](docs/RUNTIME_CONTROL.md) | SDK-local runtime control features |
| [Testing](guides/testing.md) | Mock system and testing patterns |
| [Error Handling](guides/error-handling.md) | Error types and recovery |
| [Provider Behavior Manifest](guides/provider_behavior_manifest.md) | Evidence for Claude-native feature translation |

## Upgrading

For breaking changes and migration notes, see `CHANGELOG.md`.

**0.12.0 breaking changes:**
- `Transport.Port` removed. The built-in common transport lane now runs through
  `CliSubprocessCore.Command`, `CliSubprocessCore.RawSession`, and
  `CliSubprocessCore.Session`.
- Custom transport injection removed from `Client`, `Query`, and common CLI lanes.
  Use `Options.execution_surface` for SSH/local routing instead.
- Transport error tuple shape updated: low-level failures now use `{:error, {:transport, reason}}` instead of bare `{:error, reason}`.
- String prompts now delivered via stdin (`--input-format stream-json`) instead of CLI arg (`-- prompt`).

**0.11.0 breaking changes:**
- `--print` flag removed from all modules. All queries now use `--output-format stream-json` exclusively.
- `--agents` CLI flag removed. Agents are now sent via the `initialize` control request. Use `Options.agents_for_initialize/1`.
- `AgentsFile` module deleted. Remove any `agents_temp_file_max_age_seconds` config.
- `Client` state is now a `defstruct`. Four deprecated fields removed: `current_model`, `pending_model_change`, `current_permission_mode`, `pending_inbound_count`.
- All 12 hook events are now supported (6 new: `post_tool_use_failure`, `notification`, `subagent_start`, `permission_request`, `session_start`, `session_end`).

**0.10.0 fix (resume turn persistence):**
- `resume/3` no longer uses `--print --resume` (one-shot mode that dropped intermediate turns). It now uses `--resume` with `--input-format stream-json`, preserving the full conversation history across resume calls.
- Current model defaults and aliases are owned by `cli_subprocess_core`; the native Claude default is `sonnet` (Claude Sonnet 5). Aliases: `opus` → Claude Opus 5, `opus[1m]` → Claude Opus 5 (compatibility alias; Opus 5 is itself a 1M-context model), `fable` → Claude Fable 5, `haiku` → Claude Haiku 4.5. A model id newer than the registry passes through to `--model` verbatim unless `allow_unknown_model: false`.

**0.9.0 breaking change (streaming):**
- Stream event wrappers now require `uuid` and `session_id`. Missing keys raise and terminate the streaming client.
- If you emit or mock `stream_event` wrappers, include both fields (custom transports, fixtures, tests).

That strict requirement applies to the common CLI streaming parser. The
SDK-local control lane still accepts incomplete `stream_event` wrappers and
surfaces missing metadata as `nil`, which keeps control-client transports
forward-compatible without weakening the core streaming contract.

**Additional Resources:**
- [CHANGELOG.md](CHANGELOG.md) - Version history and release notes
- [HexDocs](https://hexdocs.pm/claude_agent_sdk/) - API documentation
- [Claude Code SDK](https://docs.anthropic.com/en/docs/claude-code/sdk) - Upstream documentation

---

## License

MIT License - see [LICENSE](LICENSE) for details.

---

<div align="center">
  <sub>Built with Elixir and Claude</sub>
</div>

## Model Selection Contract

`/home/home/p/g/n/claude_agent_sdk` no longer owns active model-selection policy. Model catalog visibility, defaulting, validation, and failure semantics are owned by `/home/home/p/g/n/cli_subprocess_core` through `CliSubprocessCore.ModelRegistry.resolve/3`, `CliSubprocessCore.ModelRegistry.validate/2`, and `CliSubprocessCore.ModelRegistry.default_model/2`.

The Claude SDK now treats model values as resolved payload data and limits its responsibility to option shaping and command rendering.
## Session History And Intervention

The Claude runtime lane now publishes an honest session-control contract for orchestration layers.

- `ClaudeAgentSDK.Runtime.CLI.capabilities/0` includes `:session_history`, `:session_resume`,
  `:session_pause`, and `:session_intervene`
- `ClaudeAgentSDK.Runtime.CLI.list_provider_sessions/1` standardizes transcript-history entries for
  upper layers without flattening the richer native Claude session model

This is meant for recovery and operator-control flows, not blind retries. The caller should resume
the same session when possible and only replay work when a real continuation handle is unavailable.

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