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n8n-mcp/CHANGELOG.md
Romuald Członkowski 861005eeed fix: deprecate USE_FIXED_HTTP for SSE streaming support (Issue #524) (#525) 
* fix: deprecate USE_FIXED_HTTP for SSE streaming support (Issue #524)

The fixed HTTP implementation does not support SSE streaming required
by clients like OpenAI Codex. This commit deprecates USE_FIXED_HTTP
and makes SingleSessionHTTPServer the default.

Changes:
- Add deprecation warnings in src/mcp/index.ts and src/http-server.ts
- Remove USE_FIXED_HTTP from docker-compose.yml and Dockerfile.railway
- Update .env.example with deprecation notice
- Rename npm script to start:http:fixed:deprecated
- Update all documentation to remove USE_FIXED_HTTP references
- Mark test case as deprecated

Users should unset USE_FIXED_HTTP to use the modern SingleSessionHTTPServer
which supports both JSON-RPC and SSE streaming.

Closes #524

Concieved by Romuald Członkowski - www.aiadvisors.pl/en

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* chore: bump version to 2.31.8 and add CHANGELOG entry

- Fix comment inaccuracy: "deprecated" not "deprecated and removed"
- Bump version from 2.31.7 to 2.31.8
- Add CHANGELOG entry documenting USE_FIXED_HTTP deprecation
- Update all deprecation messages to reference v2.31.8

Concieved by Romuald Członkowski - www.aiadvisors.pl/en

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Romuald Członkowski <romualdczlonkowski@MacBook-Pro-Romuald.local>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
2026-01-07 13:42:16 +01:00

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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased]

[2.31.8] - 2026-01-07

Deprecated

USE_FIXED_HTTP Environment Variable (Issue #524)

The USE_FIXED_HTTP=true environment variable is now deprecated. The fixed HTTP implementation does not support SSE (Server-Sent Events) streaming required by clients like OpenAI Codex.

What changed:

  • SingleSessionHTTPServer is now the default HTTP implementation
  • Removed USE_FIXED_HTTP from Docker, Railway, and documentation examples
  • Added deprecation warnings when USE_FIXED_HTTP=true is detected
  • Renamed npm script to start:http:fixed:deprecated

Migration: Simply unset USE_FIXED_HTTP or remove it from your environment. The SingleSessionHTTPServer supports both JSON-RPC and SSE streaming automatically.

Why this matters:

  • OpenAI Codex and other SSE clients now work correctly
  • The server properly handles Accept: text/event-stream headers
  • Returns correct Content-Type: text/event-stream for SSE requests

The deprecated implementation will be removed in a future major version.

[2.31.7] - 2026-01-06

Changed

  • Updated n8n from 2.1.5 to 2.2.3
  • Updated n8n-core from 2.1.4 to 2.2.2
  • Updated n8n-workflow from 2.1.1 to 2.2.2
  • Updated @n8n/n8n-nodes-langchain from 2.1.4 to 2.2.2
  • Rebuilt node database with 540 nodes (434 from n8n-nodes-base, 106 from @n8n/n8n-nodes-langchain)

[2.31.6] - 2026-01-03

Changed

Dependencies Update

  • Updated n8n from 2.1.4 to 2.1.5
  • Updated n8n-core from 2.1.3 to 2.1.4
  • Updated @n8n/n8n-nodes-langchain from 2.1.3 to 2.1.4
  • Rebuilt node database with 540 nodes (434 from n8n-nodes-base, 106 from @n8n/n8n-nodes-langchain)

[2.31.5] - 2026-01-02

Added

MCP Tool Annotations (PR #512)

Added MCP tool annotations to all 20 tools following the MCP specification. These annotations help AI assistants understand tool behavior and capabilities.

Annotations added:

  • title: Human-readable name for each tool
  • readOnlyHint: True for tools that don't modify state (11 tools)
  • destructiveHint: True for delete operations (3 tools)
  • idempotentHint: True for operations that produce same result when called repeatedly (14 tools)
  • openWorldHint: True for tools accessing external n8n API (13 tools)

Documentation tools (7): All marked readOnlyHint=true, idempotentHint=true

  • tools_documentation, search_nodes, get_node, validate_node, get_template, search_templates, validate_workflow

Management tools (13): All marked openWorldHint=true

  • Read-only: n8n_get_workflow, n8n_list_workflows, n8n_validate_workflow, n8n_health_check
  • Idempotent updates: n8n_update_full_workflow, n8n_update_partial_workflow, n8n_autofix_workflow
  • Destructive: n8n_delete_workflow, n8n_executions (delete action), n8n_workflow_versions (delete/truncate)

[2.31.4] - 2026-01-02

Fixed

Workflow Data Mangled During Serialization: snake_case Conversion (Issue #517)

Fixed a critical bug where workflow mutation data was corrupted during serialization to Supabase, making 98.9% of collected workflow data invalid for n8n API operations.