Claude Code Failover

agent-migrator

A CLI tool for migrating conversation history between AI coding tools.

Supported Coding Agents

• Claude Code (Anthropic)
• Codex (OpenAI)
• Gemini CLI (Google)
• Cursor

All pairs are supported bidirectionally.

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Setup

Requires uv.

Install globally (recommended):

uv tool install agent-migrator

Or run without installing:

uvx agent-migrator

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Usage

Interactive

Run from inside a project directory:

agent-migrator

The CLI walks you through:

1. Tool selection — choose source and destination.
2. Conversation selection — pick conversations to migrate, sorted most-recent-first.
3. Migration progress — each conversation is processed in sequence; Ctrl+C cancels and rolls back.
4. Summary — a results table shows successes and errors.

Cursor: the project path must be a directory that has been opened as a workspace in Cursor at least once.

Non-interactive

Two subcommands expose the same engine for scripting and agentic use. Both accept --dir <path> (defaults to cwd) and print JSON to stdout; errors go to stderr as {"error": "..."} with exit 1.

List conversations:

agent-migrator list --from claude-code --dir /path/to/project

[{"id": "63ec7bb1-...", "name": "pwa-capabilities-demo", "updated_at": "2026-05-21T23:23:00", ...}]

Migrate a conversation:

agent-migrator move --from claude-code --to codex --id 63ec7bb1-... --dir /path/to/project

[{"source_id": "63ec7bb1-...", "destination_id": "019e51f7-...", "name": "pwa-capabilities-demo"}]

Omit --id to migrate all conversations for the project. Run agent-migrator list --help or agent-migrator move --help for full options.

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What gets migrated

All pairs support:

Feature	Status
Text messages (user and assistant)	✓
Tool calls (Read, Write, Edit, Bash, Glob, and equivalents)	✓
Plan (presented natively in the destination tool's plan UI)	✓

(Any) → Cursor is the one exception: plans are migrated as context documents but are not surfaced in Cursor's native plan mode UI.

(Any) → Cursor also requires a server upload to Cursor's ConvertOALToNAL endpoint to make all models available. If that fails (e.g. not logged in), the CLI offers a local fallback that provides full context but restricts model selection to Anthropic models.

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How it works

Conversations are read into a tool-agnostic normalized format (TextMessage and ToolCallMessage turns) and written out in the destination format. Each tool is implemented as a AgentAdapter subclass in agent_migrator/agents/. This decouples all source/destination pairs — adding a new tool requires only a new adapter; all existing migration paths continue to work unchanged.

Extensibility

To add support for a new coding agent, implement the AgentAdapter interface in agent_migrator/agents/ and register it in cli.py:

class MyAgentAdapter(AgentAdapter):
    name = "My Agent"
    tool_id = "myagent"

    def is_available(self) -> bool: ...
    def list_conversations(self, project_path: Path) -> list[ConversationInfo]: ...
    def read_conversation(self, conv_id: str, project_path: Path) -> Conversation: ...
    def write_conversation(self, conv: Conversation, project_path: Path, *, use_local_backend: bool = False) -> str: ...
    def delete_conversation(self, conv_id: str, project_path: Path) -> None: ...

Storage locations

Tool	Location
Claude Code	~/.claude/projects/<encoded-path>/<session>.jsonl
Codex	~/.codex/sessions/YYYY/MM/DD/rollout-<timestamp>-<id>.jsonl
Gemini CLI	~/.gemini/tmp/<project-slug>/chats/session-<timestamp>-<id>.jsonl
Cursor	%APPDATA%/Cursor/User/globalStorage/state.vscdb (SQLite)