feat: double clicking a component adds it to the canvase

[deon-sanchez]

read title

Summary by CodeRabbit

• New Features

  • Automatic MCP Composer start/stop for OAuth projects; project Composer URL endpoint.
  • Auto-assign API key auth on new uploads when auto-login is disabled.
  • Knowledge Base components revamped (ingestion/retrieval), with optional embeddings.
  • Config now exposes voice_mode_available.

• Bug Fixes

  • Consistent message ordering in memory retrieval.
  • Structured output returns empty table instead of error for no results.

• Refactor

  • MCP Composer env var renamed and default disabled.
  • Agent UI streamlined; Chat color/icon fields removed; File/OCR options updated.
  • Deprecated tools/components removed; model deprecations and label improvements.
  • Docling remote API updated to v1.

• Chores

  • Version bump to 1.6.0; dependency pins.
  • Gitignore and Windows script env-file handling tweaks.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

Renames MCP Composer feature flag, updates version and dependencies, adjusts Windows run scripts, adds auth update helper, significantly refactors MCP project/composer orchestration and project lifecycle hooks, renames/reshapes knowledge base components, removes deprecated tools/components, tweaks several core behaviors, and updates many component UI labels and replacement metadata.

Changes

Cohort / File(s)	Summary
Config and Versioning /.env.example, /pyproject.toml, /.gitignore	Renamed env var to LANGFLOW_MCP_COMPOSER_ENABLED with default false; version bump to 1.6.0 and pinned composio deps; added member_servers.json to .gitignore.
Windows run script env-file handling /scripts/windows/build_and_run.bat, /scripts/windows/build_and_run.ps1	Switched to explicit uv --env-file usage; replaced ENV_FILE_PARAM with USE_ENV_FILE (bat); moved flag to top-level uv run (ps1).
MCP auth/composer orchestration /src/backend/base/langflow/api/v1/auth_helpers.py, /src/backend/base/langflow/api/v1/mcp_projects.py, /src/backend/base/langflow/api/v1/projects.py	New handle_auth_settings_update; mcp_projects adds composer lifecycle, OS-aware SSE URLs, access verification changes, optional returns, new route; projects hook starts/stops composer on auth changes, auto API-key on create/upload, deletes stop composer.
API schema /src/backend/base/langflow/api/v1/schemas.py	Added ConfigResponse.voice_mode_available.
Core behavior tweaks /.../base/agents/events.py, .../base/constants.py, .../base/data/docling_utils.py, .../base/data/utils.py, .../components/processing/structured_output.py, .../components/helpers/memory.py	Removed “Input” prefix in agent text; un-skipped File components; OCR enablement checks "None"; reordered TEXT_FILE_TYPES; structured_output returns empty DataFrame on empty; unified last-N memory retrieval ordering.
Knowledge Base refactor /.../components/knowledge_bases/__init__.py, .../knowledge_bases/ingestion.py, .../knowledge_bases/retrieval.py, .../components/data/__init__.py	Renamed KB components to KnowledgeIngestion/KnowledgeRetrieval, changed inputs/outputs and behavior (Data/DataFrame handle input, error raising; retrieval options incl. embeddings); removed old KB components from data exports.
Data ingestion/processing updates .../components/data/file.py, .../components/data/api_request.py, .../components/docling/docling_remote.py, .../components/docling/docling_inline.py, .../components/data/csv_to_data.py, .../components/data/json_to_data.py	File: extensions list and OCR UI/defaults adjusted; api_request unwraps .data at body/list-item; docling remote API path/payload keys updated; removed real_time_refresh flags; added replacement metadata to csv/json to data.
Components: replacements and cleanup .../components/tools/*.py, .../components/processing/*.py, .../components/helpers/*.py, .../components/logic/*.py, .../components/embeddings/*.py, .../components/google/gmail.py	Added many replacement attributes; removed deprecation labels on several; removed structured_response output and memory inputs from Agent; added “connect other models” option.
Deprecated components removed .../components/deactivated/mcp_sse.py, .../components/deactivated/mcp_stdio.py, .../components/tools/google_search_api.py, .../components/tools/google_serper_api.py, .../components/prototypes/python_function.py	Deleted deprecated MCP and Google search tool components and PythonFunction prototype.
Public exports adjustments .../components/__init__.py, .../components/tools/__init__.py, .../components/datastax/__init__.py	Removed prototypes export; removed Google Search/Serper from tools exports; updated datastax lazy import path.
Model metadata .../base/models/anthropic_constants.py	Marked claude-3-sonnet-20240229 as deprecated in metadata.
Chat UI components .../components/input_output/chat.py, .../components/input_output/chat_output.py	Removed color/icon inputs and related Message properties handling.
UI label text updates .../components/**/* (agentql, azure, clickhouse, confluence, datastax, deactivated/chat_litellm_model, deactivated/metal, elastic, embeddings/text_embedder, firecrawl/, huggingface/, ibm/*, icosacomputing, milvus, olivya, qdrant, redis, langchain_utilities/langchain_hub.py, twelvelabs, aiml)	Updated various display_name labels for API keys/passwords; no logic changes.

Sequence Diagram(s)

sequenceDiagram
  autonumber
  actor User
  participant FE as Frontend
  participant API as Projects API
  participant AH as handle_auth_settings_update
  participant CS as MCPComposerService
  participant REG as register_project_with_composer

  User->>FE: Update project (auth_settings)
  FE->>API: PATCH /projects/{id} (auth_settings)
  API->>AH: handle_auth_settings_update(project, new_auth)
  AH-->>API: {start, stop, handle}
  alt start composer (oauth)
    API->>REG: register_project_with_composer(project)
    REG->>CS: get_or_start(project auth, name, id)
    CS-->>REG: composer started/registered
    REG-->>API: ok
  else stop composer
    API->>CS: stop(project_id)
    CS-->>API: stopped
  end
  API-->>FE: 200 OK (project updated)

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sequenceDiagram
  autonumber
  actor Client
  participant API as MCP Projects API
  participant DB as DB Session
  participant ACC as verify_project_access
  participant SSE as SSE URL Resolver

  Client->>API: GET /mcp/{project_id}/composer-url
  API->>DB: verify_project_auth(db, project_id, token)
  API->>ACC: verify_project_access(project_id, user)
  ACC-->>API: project
  API->>SSE: get_composer_sse_url(project)
  SSE-->>API: os-aware URL
  API-->>Client: 200 {url or error payload}

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Estimated code review effort

🎯 4 (Complex) | ⏱️ ~75 minutes

Possibly related PRs

• feat: mcp composer integration #9506 — Adds MCP Composer integration and API changes in mcp_projects; overlaps with composer lifecycle/auth introduced here.
• fix: disable mcp auto install for not installed applications, refactor mcp-projects logic #9599 — Renames MCP composer feature flag, updates versioning, and fixes Windows env-file handling similar to this PR.
• fix: Knowledge base component refactor #9543 — Refactors knowledge base components, aligning with renaming to KnowledgeIngestion/KnowledgeRetrieval and export updates in this PR.

✨ Finishing Touches

• 📝 Generate Docstrings

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch lfoss-2083

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[sonarqubecloud]

Quality Gate failed

Failed conditions
13 Security Hotspots
D Reliability Rating on New Code (required ≥ A)

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