LangSmith Data Migration Tool

A Python CLI for migrating users and roles, datasets, experiments, annotation queues, project rules, prompts, charts, and Fleet resources between LangSmith instances, plus CSV-driven access sync for a single LangSmith deployment.

Quick Start

# Install (requires uv: https://docs.astral.sh/uv/)
uv tool install "langsmith-data-migration-tool @ https://github.com/langchain-ai/langsmith-data-migration-tool/releases/latest/download/langsmith_data_migration_tool-0.0.80-py3-none-any.whl"

# Set up environment variables
export LANGSMITH_OLD_API_KEY="your_source_api_key"
export LANGSMITH_NEW_API_KEY="your_destination_api_key"

# Test connections
langsmith-migrator test

# Start migrating
langsmith-migrator datasets

Features

• All-in-One Wizard: Interactive migration of all resources (migrate-all)
• Users & Roles: Migrate custom roles, org members, and workspace memberships between instances
• Export Users to CSV: Export active org and workspace members to a members CSV (export-users) that round-trips into the users --members-csv importer
• Single-Instance Access Sync: Apply CSV-driven add/update or authoritative access sync to one LangSmith instance (users --csv ... [--sync]), including multi-row workspace role unionization for custom ABAC roles
• Datasets: Migrate datasets with examples and file attachments
• Experiments: Include experiments, runs, and feedback during dataset migration (datasets --include-experiments) or through migrate-all
• Annotation Queues: Transfer queue configurations
• Project Rules: Copy automation rules with project mapping and optional project creation in interactive flows
• Prompts: Migrate prompts (latest by default, full history with --include-all-commits)
• Charts: Migrate monitoring charts with filter preservation
• Fleet: Migrate agents, shared skills, MCP servers, integrations, auth providers, schedules, triggers, webhooks, usage limits, sandbox policies, and workspace secrets (fleet)
• Workspace Scoping: Run resource migrations per workspace pair with explicit IDs or interactive workspace mapping
• Remediation & Resume: Persist migration state, write remediation bundles, print grouped actionable next steps, and retry pending/failed work with resume
• Interactive CLI: TUI-based selection with search/filter, plus --non-interactive mode for automation

Limitations

Trace Data Not Supported

This tool does not support migrating trace data. It migrates:

• Datasets and examples (including file attachments)
• Experiments, runs, and feedback
• Annotation queues
• Project rules
• Prompts
• Charts
• Fleet resources (agents, skills, MCP servers, integrations, auth providers, schedules, triggers, webhooks, usage limits, sandbox policies, secrets)

For trace data, use LangSmith's Bulk Export functionality: LangSmith Bulk Export Documentation

Fleet Secrets and Auth Provider Secrets Are Write-Only

The Fleet API does not return secret values. When migrating workspace secrets, the tool creates placeholder entries on the destination with empty values. You must re-enter each secret's value manually on the destination after migration. Similarly, auth provider client_secret values cannot be read from the source and must be re-entered on the destination.

Fleet Per-User OAuth Connections Cannot Be Migrated

Agent OAuth connections (Gmail, Slack, GitHub, etc.) are tied to individual user tokens and cannot be transferred between instances. After migration, each user must re-authenticate their OAuth connections on the destination. The tool prints remediation steps listing which agents need re-authentication.

Fleet Agent Ownership Requires a Personal Access Token

Fleet agent ownership is determined by the authenticated user, not by a field in the request body. Workspace API keys (lsv2_sk_*) do not carry a user identity, so agents created with them have no owner and become invisible to everyone. To assign ownership of migrated agents, use a Personal Access Token (lsv2_pt_*) for LANGSMITH_NEW_API_KEY. The PAT creator becomes the owner of all migrated agents. After migration, individual users can clone their agents from the workspace to transfer ownership to themselves.

Fleet Agent Shared Users Are Filtered

The shared_users permission (per-user read/run/write access lists) references user IDs that are org-scoped. The tool fetches the destination workspace's active member list and filters shared_users to keep only user IDs that exist on the destination. User IDs not found on the destination are removed, and the tool prints a warning. If the destination member list can't be fetched, all shared_users are stripped as a safety measure. Re-share agents with any missing users after migration via the Fleet UI.

Fleet Agent Models Are Substituted When Unavailable

The destination instance may not support the same model IDs as the source (e.g. SaaS vs BYOC may offer different model providers). The tool fetches the destination's model catalog and substitutes unavailable models with a model from the same provider if available, or falls back to the first available model. A warning is logged for each substitution. Set the correct model manually after migration if needed.

Fleet Existing Resources Are Never Overwritten

All Fleet migrators skip resources that already exist on the destination, regardless of the --skip-existing flag. This prevents overwriting org-scoped infrastructure (auth providers, MCP servers, integrations) that may already be correctly configured on the destination. Re-running fleet is safe and idempotent.

Fleet Infrastructure-Level Configuration Is Not API-Migratable

OAuth providers, GitHub App, and Slack app configuration are set at the infrastructure level (Helm chart for self-hosted, or cloud provider console). The tool cannot migrate these. For BYOC deployments, configure OAuth providers in your langsmith_config.yaml as described in the self-hosted Fleet setup docs.

Experiment Timestamps Are Rewritten on Migration

The destination's POST /runs/batch endpoint rejects runs with timestamps outside a 24-hour window of "now", so historical experiments cannot be replayed with their original timestamps. To migrate experiment runs at all, this tool shifts every run's start_time, end_time, dotted_order, and events[].time (and the parent experiment's start_time/end_time) by a per-experiment delta so the newest timestamp lands at migration time. Relative offsets between runs within the same experiment are preserved exactly. The delta is persisted in migration state so resumed migrations apply the same shift to remaining runs.

Installation

Prerequisites: Python 3.12+, uv

Option 1: uv tool install (Recommended)

uv tool install "langsmith-data-migration-tool @ https://github.com/langchain-ai/langsmith-data-migration-tool/releases/latest/download/langsmith_data_migration_tool-0.0.80-py3-none-any.whl"

# To update an existing installation, use --force:
uv tool install --force "langsmith-data-migration-tool @ https://github.com/langchain-ai/langsmith-data-migration-tool/releases/latest/download/langsmith_data_migration_tool-0.0.80-py3-none-any.whl"

Option 2: uvx (One-off execution, no install)

uvx --from "langsmith-data-migration-tool @ https://github.com/langchain-ai/langsmith-data-migration-tool/releases/latest/download/langsmith_data_migration_tool-0.0.80-py3-none-any.whl" langsmith-migrator test

Option 3: pip

pip install "langsmith-data-migration-tool @ https://github.com/langchain-ai/langsmith-data-migration-tool/releases/latest/download/langsmith_data_migration_tool-0.0.80-py3-none-any.whl"

Option 4: From source (Development/Contributing)

git clone https://github.com/langchain-ai/langsmith-data-migration-tool.git
cd langsmith-data-migration-tool
uv sync
# Run with: uv run langsmith-migrator <command>

Configuration

Environment Variables

export LANGSMITH_OLD_API_KEY="your_source_api_key"
export LANGSMITH_NEW_API_KEY="your_destination_api_key"

# Optional: Custom base URLs (default: https://api.smith.langchain.com)
export LANGSMITH_OLD_BASE_URL="https://your-source-instance.com"
export LANGSMITH_NEW_BASE_URL="https://your-destination-instance.com"

Or use a .env file (auto-loaded on startup):

LANGSMITH_OLD_API_KEY=your_source_api_key
LANGSMITH_NEW_API_KEY=your_destination_api_key
LANGSMITH_OLD_BASE_URL=https://your-source-instance.com
LANGSMITH_NEW_BASE_URL=https://your-destination-instance.com
LANGSMITH_VERIFY_SSL=true

Usage

# Test connections
langsmith-migrator test

# Interactive wizard for all resources
langsmith-migrator migrate-all
langsmith-migrator migrate-all --rules-create-enabled   # Create migrated rules as enabled

# Datasets
langsmith-migrator datasets                    # Interactive selection
langsmith-migrator datasets --all              # All datasets
langsmith-migrator datasets --include-experiments  # With experiments, runs, and feedback

# Note: When running `datasets` without `--include-experiments`, you'll be prompted
# interactively whether to include experiments. Experiments include all runs and feedback.

# Annotation queues
langsmith-migrator queues

# Prompts
langsmith-migrator prompts
langsmith-migrator prompts --all --include-all-commits

# Project rules
langsmith-migrator rules
langsmith-migrator rules --strip-projects      # As global rules
langsmith-migrator rules --project-mapping '{"old-project-id": "new-project-id"}'
langsmith-migrator rules --project-mapping mapping.json   # From file
langsmith-migrator rules --map-projects         # Interactive TUI project mapping
langsmith-migrator rules --create-enabled      # Create rules enabled (default: disabled)

# Charts
langsmith-migrator charts
langsmith-migrator charts --session "project-name"
langsmith-migrator charts --map-projects        # Interactive TUI project mapping
langsmith-migrator charts --project-mapping '{"old-project-id": "new-project-id"}'  # Headless, no TUI
langsmith-migrator charts --project-mapping mapping.json   # Headless, from file
langsmith-migrator charts --same-instance       # Reuse source IDs only when both sides share IDs

# Fleet resources (agents, skills, MCP servers, etc.)
langsmith-migrator fleet                        # Migrate all Fleet resources
langsmith-migrator fleet --skip-agents          # Skip agent migration
langsmith-migrator fleet --skip-skills --skip-mcp-servers  # Skip specific resources

# Utilities
langsmith-migrator export-users --source -o users.csv  # Export active members to a members CSV
langsmith-migrator list-projects --source
langsmith-migrator list_workspaces --source --dest
langsmith-migrator resume  # Resume pending/failed items from a prior migration session
langsmith-migrator clean

Command Overview

• test: verify source and destination connectivity before running a migration
• migrate-all: guided end-to-end wizard for users, datasets, prompts, queues, rules, charts, and Fleet resources
• datasets: migrate datasets; optionally include experiments, runs, and feedback
• queues: migrate annotation queues
• prompts: migrate prompts, optionally with full commit history
• rules: migrate automation rules with project mapping controls
• charts: migrate monitoring charts, either all sessions or one named session/project
• fleet: migrate Fleet resources (agents, skills, MCP servers, integrations, auth providers, schedules, triggers, webhooks, usage limits, sandbox policies, secrets) with --skip-* flags for each resource type
• users: migrate users/roles between instances, or run single-instance CSV access sync
• export-users: export active org and workspace members to a members CSV for import via users --members-csv
• resume: retry resumable items from a prior session and show grouped manual blockers
• list-projects / list_workspaces: inspect project and workspace IDs for mapping
• clean: remove saved migration sessions

Exporting users to CSV

Use export-users to write the active org and workspace members of an instance to a members CSV. The output uses the exact columns the importer expects (email, langsmith_role, workspace_id, workspace_name), so an export from one instance feeds straight into users --members-csv on another.

# Export everything from the source instance (default output: users.csv)
langsmith-migrator export-users --source -o users.csv

# Export from the destination instead
langsmith-migrator export-users --dest -o dest_users.csv

# Org-level memberships only (skip workspace members)
langsmith-migrator export-users --source --org-only -o org_users.csv

# Restrict workspace membership export to specific workspace IDs (repeatable)
langsmith-migrator export-users --source --workspace ws_a --workspace ws_b -o subset.csv

Notes:

• Pending invites are not exported — only accepted (active) memberships are included.
• Built-in roles are written with their display label (e.g. Organization Admin); custom roles use their display name.
• Members whose role can't be mapped to a CSV label are still exported but with an empty langsmith_role; the command lists them so you can fill the value in before importing.
• --source is the default if neither --source nor --dest is given; --org-only cannot be combined with --workspace.

When importing into a different instance, the CSV's workspace_id values are the source workspace IDs — map them to the destination with users --members-csv ... --source-workspace <SRC> --dest-workspace <DST> (or --map-workspaces).

Users migration with CSV member input

When running users, you can provide member details from CSV instead of source member list APIs:

langsmith-migrator users --members-csv examples/users_members_example.csv --map-workspaces

For a single deployed LangSmith instance, users can also run as an access-sync command instead of a source→destination migration.

Safe default: add or update access from the CSV without removing anyone:

langsmith-migrator users \
  --api-key "$LANGSMITH_API_KEY" \
  --url "https://your-langsmith-instance.example.com" \
  --csv examples/users_members_example.csv

Preview the same run without making changes:

langsmith-migrator users \
  --dry-run \
  --api-key "$LANGSMITH_API_KEY" \
  --url "https://your-langsmith-instance.example.com" \
  --csv examples/users_members_example.csv

Authoritative mode: make the CSV the source of truth for access and remove anything not present:

langsmith-migrator users \
  --api-key "$LANGSMITH_API_KEY" \
  --url "https://your-langsmith-instance.example.com" \
  --csv examples/users_members_example.csv \
  --sync

Equivalent explicit form:

langsmith-migrator \
  --dest-key "$LANGSMITH_API_KEY" \
  --dest-url "https://your-langsmith-instance.example.com" \
  users \
  --single-instance \
  --members-csv examples/users_members_example.csv \
  --csv-source-of-truth

In --single-instance mode, the command mirrors the provided instance configuration onto both internal clients, so you only need one working LangSmith connection. Workspace rows use the target workspace IDs directly; there is no workspace mapping step. All CSV rows are applied automatically after a single confirmation summary; there is no row-selection step in this mode. --api-key/--url imply --single-instance, --csv is a short alias for --members-csv, and --sync is a short alias for --csv-source-of-truth. users --dry-run is also supported as a command-local preview flag if you prefer to put dry-run after the subcommand instead of before it. For cron jobs and other headless runs, users --non-interactive is also supported as a command-local alias for the global langsmith-migrator --non-interactive users ... form. In headless mode, missing credentials fail fast instead of prompting.

CSV schema:

email,langsmith_role,workspace_id,workspace_name
alice@example.com,Organization Admin,,
alice@example.com,Workspace Admin,ws_src_prod_us,Production US

Example CSVs:

• examples/users_members_example.csv: minimal org and workspace member rows.
• examples/users_members_multi_workspace_roles_example.csv: users with multiple workspace assignments, including different workspace roles.
• examples/users_members_sync_remove_workspace_b_example.csv: desired-state CSV for --csv-source-of-truth when a user should keep Workspace A and lose Workspace B.
• examples/users_members_sync_remove_user_example.csv: desired-state CSV for --csv-source-of-truth after a removed user has been omitted entirely.
• examples/users_members_pending_mixed_workspace_roles_example.csv: pending-invite examples for same-role multi-workspace invites and mixed workspace-role rows.

These examples are templates. Do not run them with --csv-source-of-truth against a populated target unless the file has been expanded into the full desired org and workspace access state for that target; authoritative sync removes org users, pending invites, and workspace memberships that are not listed.

Notes:

• email and langsmith_role are required.
• workspace_id is optional. Leave it empty for org-level role assignments.
• workspace_name is optional. When provided in single-instance CSV sync, it is validated against the target workspace display name, name, or tenant handle; workspace_id remains authoritative for applying access.
• langsmith_role should be a built-in LangSmith role name (for example Organization Admin, Organization Operator, Organization User, Organization Viewer, Workspace Admin, Workspace User, or Workspace Viewer) or a custom role display_name.
• Multiple rows for the same user and workspace are combined. Built-in workspace roles collapse to the highest-privilege built-in role; custom ABAC roles are unioned with each other and with any built-in workspace role so their policy attachments are preserved.
• Users who only appear in workspace rows are invited to the org with the source ORGANIZATION_USER role before workspace membership is applied.
• Workspace-only users with multiple workspace roles cannot have all workspace access attached to the initial org invite. The command calls this out before apply, attempts phase 3 workspace membership application, and may require a rerun after the invite is accepted on target versions that block workspace membership for pending org invites.
• Organization Admin on a workspace row is treated as org-level admin access only. No explicit workspace membership is created because org admins already have workspace access.
• Other org-scoped roles cannot be used on workspace rows. If you want org-level access, leave workspace_id empty.
• Workspace-scoped roles such as Workspace Admin cannot be used on org-level rows.
• --sync / --csv-source-of-truth is the only mode that removes access. Without it, single-instance CSV mode only adds or updates access.
• --csv-source-of-truth is available with --single-instance and makes the CSV authoritative for access:
  • users missing from the CSV are removed from the org
  • pending org invites missing from the CSV are cancelled
  • workspace memberships missing from the CSV are removed
  • workspaces omitted from the CSV are treated as having no desired memberships

Guardrails:

• --api-key and --url must be provided together when either is used.
• --single-instance requires --csv / --members-csv.
• --sync requires --csv and cannot be combined with --skip-existing or --skip-workspace-members.
• --single-instance cannot be combined with workspace mapping flags.
• --roles-only cannot be combined with --single-instance or --members-csv.
• If the CSV contains workspace rows and --skip-workspace-members is set, the command fails instead of silently ignoring those rows.
• If the CSV contains workspace-only users, the target instance must have an ORGANIZATION_USER role available or the command fails before applying member changes.
• If the CSV references unknown workspace_id values, the command fails before any membership changes are applied.

Operational notes:

• Authoritative sync can remove active org members, cancel pending invites, and remove workspace memberships. Use an Organization Admin PAT for unattended runs that need removal semantics.
• If the destination API key cannot manage org members or pending invites, 401/403 responses are reported as Organization Admin PAT blockers with grouped remediation and resume metadata.
• Pending invites whose org role or workspace access does not match the CSV are refreshed when the target supports invite cancellation; if the target lacks a cancellation endpoint, the command reports an explicit manual follow-up instead of silently accepting stale access.

CLI Options

--source-key TEXT       Source API key
--dest-key TEXT         Destination API key
--source-url TEXT       Source base URL
--dest-url TEXT         Destination base URL
--no-ssl                Disable SSL verification
--batch-size INTEGER    Batch size for operations (1-1000, default: 100)
--workers INTEGER       Number of concurrent workers (1-10, default: 4)
--dry-run               Run without making changes
--skip-existing         Skip existing resources instead of updating them
--non-interactive       Disable prompts and exit with code 2 when remediation is required
--verbose, -v           Verbose output

Dataset Options

--include-experiments   Include experiments with datasets
--all                   Migrate all datasets

Prompt Options

--all                   Migrate all prompts
--include-all-commits   Include all commit history

Rules Options

--strip-projects        Strip project associations and create as global rules
--project-mapping TEXT  JSON string or file path with project ID mapping (e.g., '{"old-id": "new-id"}')
--map-projects          Launch interactive TUI to map source projects to destination projects
--create-enabled        Create rules as enabled (default: disabled to bypass secrets validation)
--all                   Migrate all rules without interactive selection

Migrate-All Rules Options

--rules-create-enabled  Create migrated rules as enabled (default: disabled)

If --rules-create-enabled is omitted, migrate-all asks interactively whether to create rules enabled. The prompt default is No (rules are created disabled).

Migrate-All Options

--skip-users            Skip user and role migration
--skip-datasets         Skip dataset migration
--skip-experiments      Skip experiment migration
--skip-prompts          Skip prompt migration
--skip-queues           Skip annotation queue migration
--skip-rules            Skip rules migration
--skip-charts           Skip chart migration
--include-all-commits   Include all prompt commit history
--strip-projects        Strip project associations from rules
--map-projects          Launch interactive TUI to map source projects to destination projects
--project-mapping TEXT  JSON string or file path with project ID mapping (headless, no TUI; mutually exclusive with --map-projects)
--rules-create-enabled  Create migrated rules as enabled instead of asking interactively

Chart Options

--session TEXT          Migrate charts for a specific session/project (by name or ID)
--map-projects          Launch interactive TUI to map source projects to destination projects
--project-mapping TEXT  JSON string or file path with project ID mapping (headless, no TUI; mutually exclusive with --map-projects)
--same-instance         Reuse source project/session IDs on destination only when both sides truly share IDs

Users Options

--dry-run                  Preview this users sync without making POST/PATCH/DELETE changes
--non-interactive          Disable prompts for this users run. Same as the global --non-interactive.
--roles-only               Only migrate custom roles (skip member migration)
--skip-workspace-members   Skip workspace member migration
--single-instance, --instance
                           Use one target LangSmith instance for CSV-driven access sync instead of source→destination migration
--csv-source-of-truth, --sync
                           Make the CSV authoritative for single-instance sync: any active org user or pending invite not
                           present in the CSV will be removed, and workspace memberships not present in the CSV will also
                           be removed. Without this flag, CSV mode only adds or updates access.
--members-csv, --csv PATH  CSV file with member details (email, langsmith_role, workspace_id, workspace_name)
                           Replaces source member API lookups. In --single-instance mode, all CSV rows are applied
                           automatically.
--api-key TEXT             API key for the single-instance CSV sync target. Must be provided together with --url.
--url TEXT                 Base URL for the single-instance CSV sync target. Must be provided together with --api-key.
--source-workspace TEXT    Source workspace ID (skip auto-detection)
--dest-workspace TEXT      Destination workspace ID (skip auto-detection)
--map-workspaces           Force workspace mapping TUI even for single-workspace instances

Common Workspace Options

These flags are available on datasets, queues, prompts, rules, charts, migrate-all, and users:

--source-workspace TEXT    Source workspace ID (skip auto-detection)
--dest-workspace TEXT      Destination workspace ID (skip auto-detection)
--map-workspaces           Force workspace mapping TUI even for single-workspace instances

Migration proceeds in three phases:

1. Role sync (org-scoped): match built-in roles by name, create/update custom roles
2. Org members (org-scoped): invite missing members, update roles for existing ones
3. Workspace members (per workspace pair): add members to workspaces with correct roles

Rules are created disabled by default. Use --create-enabled on the rules command to override.

Migrate-All Users Options

--skip-users               Skip user and role migration in migrate-all wizard

When --skip-users is omitted, migrate-all runs user/role migration as Step 0 before all other resources. Phases 1-2 (roles + org members) run once; phase 3 (workspace members) runs per workspace pair.

Project Mapping

Rules and charts reference projects by ID. When migrating between instances, project IDs differ.

• Interactive TUI (--map-projects): Launch a visual TUI to map source projects to destination projects. Available on rules, charts, and migrate-all commands. Select a source project and type a destination name directly — existing projects appear as filterable suggestions below the input, and pressing Enter on a unique suggestion records the destination project ID used by downstream chart/rule validation. Supports auto-match by name, skip, and custom name entry. For ID-based chart/rule remapping, unresolved text entries remain unmapped instead of being counted as resolved.
• Headless mapping (--project-mapping): Available on rules, charts, and migrate-all. Supply an explicit source->destination project ID mapping as a JSON string or a file path (e.g. '{"<source-project-id>": "<dest-project-id>"}'). Use list-projects --source and list-projects --dest to get IDs. This runs the mapping with no interactive TUI, so the migration can be driven from a backend/CI onboarding job. For rules, the mapping is applied to both top-level project associations and project IDs embedded inside rule filters. Mutually exclusive with --map-projects.
• Rules queue targets: When a rule references an annotation queue, the migrator first reuses any saved queue migration mapping, then falls back to an exact-name queue match in the destination workspace. If neither is safe, the rule is exported for remediation instead of being posted with the source queue ID.
• Charts: Without --map-projects, project mapping is built automatically by matching project names between source and destination. When both sides point at the same deployment URL but use different API keys/workspaces, charts still remap project/session IDs; the tool does not treat that as --same-instance. Workspace-scoped --map-projects mappings are resolved against the active workspace pair so duplicate project names in other workspaces are ignored. Chart dependency validation also verifies that saved destination project IDs still exist before migration. Chart filters are normalized to the destination API's session/session_id project-scoping shape before create or update.
• migrate-all: Supports --strip-projects, --map-projects, --project-mapping (headless JSON/file mapping applied to both rules and charts), and --rules-create-enabled for rules.

Interactive Selection

Keyboard shortcuts in resource selection TUI:

• ↑↓ Navigate | Space Toggle | a Select all | n Clear
• / Search | Enter Confirm | Esc Cancel

Keyboard shortcuts in project mapper TUI (--map-projects):

• Enter/Space Edit destination | s Skip | m Same name | u Unmap
• a Auto-match all | / Search | Ctrl+S Save | Esc Cancel

Keyboard shortcuts in workspace mapper TUI (--map-workspaces):

• Enter Pick destination | n Create new | c Create all unmapped
• p Map projects | s Skip | a Auto-match all | u Unmap
• Ctrl+S Save | Esc Cancel

Workspace Scoping

For multi-workspace organizations, all resource commands support workspace-scoped migration:

# Interactive workspace mapping TUI (available on all commands)
langsmith-migrator datasets --map-workspaces
langsmith-migrator queues --map-workspaces
langsmith-migrator prompts --map-workspaces
langsmith-migrator rules --map-workspaces --map-projects
langsmith-migrator charts --map-workspaces --map-projects
langsmith-migrator migrate-all --map-workspaces

# Explicit workspace pair
langsmith-migrator datasets --source-workspace WS_ID --dest-workspace WS_ID

When using --map-workspaces, each command iterates all mapped workspace pairs, running the full fetch/select/migrate flow per pair. For rules and charts with --map-projects, the project mapping TUI is shown per workspace pair so projects are correctly scoped.

Resume and Remediation

Every migration session persists state and writes a remediation bundle when there are blocked or manual-follow-up items.

• Session state is stored under ~/.langsmith-migrator/state.
• Remediation bundles are written under ./.langsmith-migrator/remediation/<session_id> by default.
• The CLI prints a Resolution Summary with grouped Actionable Next Steps instead of one repeated line per failed item.
• --non-interactive disables prompts and exits with status code 2 if manual remediation is still required.

langsmith-migrator resume retries pending or failed items from a previous session. Today that includes:

• datasets
• experiments
• prompts
• annotation queues
• rules
• charts
• org members
• workspace members

For chart items, resume revalidates saved --same-instance metadata against the current source/destination and workspace context. If the mode changed, it re-resolves the destination project/session before retrying; if that cannot be resolved safely, the item is checkpointed with guidance to rerun charts with project mapping. A later successful charts --map-projects run marks the prior chart dependency blocker resolved so resume does not keep looping on stale blocked state. Global or dataset-only charts that have no project/session dependency can resume with dest_session_id=None.

Use langsmith-migrator clean to remove saved sessions once you no longer need their state or remediation bundles.

SSL Certificate Issues

For self-hosted instances with SSL errors:

# Use --no-ssl flag
langsmith-migrator --no-ssl datasets

# Or set environment variable
export LANGSMITH_VERIFY_SSL=false

License

MIT License - see LICENSE for details.

Contributing

Contributions welcome! Fork, create a feature branch, and submit a Pull Request.

Release checklist

For release changes, update all of:

• pyproject.toml version
• CHANGELOG.md release notes
• README.md release-facing docs/examples

CI enforces this on pull requests: if pyproject.toml or CHANGELOG.md changes, README.md must also be updated (including dependency-only bumps).

Support

For issues or questions: GitHub repository