dsh-codex-sync MCP server

⚡ dsh-codex-sync

Two-way Codex↔DSH bridge: skills from ~/.codex/skills, session import with workspace attach, live MCP mirroring of mcp_servers, and a Codex-side reverse MCP installer. 2-way project chat sync · Live Skills mount · Auto MCP mirroring · Native modern UI

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🤔 Why dsh-codex-sync?

When using OpenAI Codex, developers build up significant workflow assets:

1. Rich project chat histories with complete code contexts, architecture decisions, and debugging steps;
2. Custom Skills libraries under ~/.codex/skills with tailored instructions and scripts;
3. Configured MCP toolchains for databases, web searches, and browser automation.

When adopting or exploring DeepSeek Harness (DSH), developers typically face major friction:

• Lost conversation history: Incompatible session formats prevent resuming past Codex tasks in DSH;
• Configuration duplication and drift: Skills and MCP servers must be manually recreated and maintained in two separate tools;
• One-way dead ends: Most migration scripts are one-time destructive copies that offer no clean way to safely bring DSH continuations back to Codex.

dsh-codex-sync eliminates this friction completely. It is not a throwaway migrator, but a production-grade, continuous two-way bridge between Codex and DSH.

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✨ Key Highlights

1. 💬 Two-Way Safe Project Chat Portability (Codex ⇄ DSH)

• Import from Codex:
  • Browse conversations grouped by workspace folder in an intuitive project tree;
  • Preserves user prompts, assistant outputs, reasoning traces, and tool-call trajectories;
  • Automatically attaches imported sessions to matching workspaces for seamless continuation;
  • Incremental re-import: Codex conversations continued after the initial import are marked as updated and append only new turns without creating duplicate sessions.
• Export to Codex:
  • Export DSH native conversations or continuations back into Codex;
  • Automatically matches Codex's workspace catalog, gracefully locking unknown directories to prevent orphan threads;
  • Creates clean, standalone Codex rollouts (history_mode: legacy) and SQLite index entries without modifying or overwriting original Codex histories;
  • View and continue chats in Codex immediately after restarting the Codex app.
• Sub-Agent Thread Filtering:
  • Hides internal sub-agent threads by default to keep the conversation list focused;
  • Easily expand and nest sub-agents under parent threads for selective, independent export.

2. ⚡ Live First-Class Skills Mounting

• Mounts ~/.codex/skills/*/SKILL.md directly into DSH's native skill catalog;
• Full support for nested directory resources and multi-file skill bundles;
• Zero-restart updates: Edit a skill file on disk, and DSH recognizes the change on the next turn.

3. 🔌 Automated Bidirectional MCP Mirroring

• Codex → DSH: Watches ~/.codex/config.toml live, dynamically mirroring [mcp_servers.*] to DSH with conflict avoidance and stderr silencing;
• DSH → Codex (Reverse Bridge): Single-command setup (npx dsh-codex-sync codex-install) equips your Codex agent with tools to search, inspect, and install DSH plugins.

4. 🎨 Native Modern UI Experience

• Adaptive Sidebar Trigger: Sits right beside the workspace header when expanded, and aligns below the search button when collapsed;
• Centered Modal Panel: High-contrast, backdrop-blurred settings card with intuitive action cards, real-time switch feedback, and zero UI cutoff;
• Polished Design Integration: Uses native DSH design tokens (--dsw-alias-*), pure CSS transitions with zero hover artifacts, and responsive text truncation.

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📦 Quick Start

1. Install in DSH

Install via DSH Plugin Market (recommended):

dsh plugin --profile web add dsh-codex-sync

Or configure inside your profile's cordis.patch.yml:

- insert:
    - id: codex-sync
      name: dsh-codex-sync
      config:
        maxSkills: 30
        mcpMirrorDeny:
          - node_repl
        mcpMirrorSilent:
          - exa

2. Configure Codex Reverse MCP Bridge (Optional)

# Register [mcp_servers.dsh-plugins] in ~/.codex/config.toml
npx dsh-codex-sync codex-install

# Run diagnostic health check
dsh-codex-sync doctor

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🎛️ Sync Settings & Toggles

Click the Codex Icon in the sidebar to open the centered control modal:

Section	Item	Command / Config Key	Description
Actions	Import from Codex	/import-all	Open project picker to import chats into DSH
	Export to Codex	/export-codex	Export DSH chats into new Codex conversation copies
	Repair sessions¹	/repair-sessions [--fix]	Scan stored session logs for replay damage and heal them in place (see below)
	Mirror status	/mcp-status	Modal overview of MCP servers, health, and statuses
	Refresh states	/codex-settings	Re-sync all switch states from the host
Features	Import commands	enableImport	Enable /import-codex slash command family
	Auto import	autoImport	Automatically import new Codex chats on startup
	Instructions	enableInstructions	Inject instructions.md / AGENTS.md into prompt
	Config summary	enableConfig	Inject config.toml model settings summary into prompt
	Skills	enableSkills	Register ~/.codex/skills as live DSH skills
	MCP mirror	mcpMirror	Auto-mirror [mcp_servers.*] (applies immediately)
Language	Language Switcher	Language	Toggle between 简体中文 / English

¹ A subtle hint at the bottom-left of the settings modal links imported-chat errors to this command.

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🩺 Troubleshooting: token meter / replay errors on imported chats

Symptom — switching the model or running compaction on an (imported) conversation fails with:

command.execute failed: internal: token meter: assistant/message at seq N has no matching step/start event
corrupt session log: seq gap in committed region at line L

Why — DSH's token meter validates the whole event log via cold replay when the model changes (provider usage anchors become invalid). Logs written before v1.6.0 lacked paired step/start…step/end markers, and mixed logs can carry stale seq citations — both fail loud only during that replay.

Fix — run this in any DSH chat (or dsh-codex-sync repair-sessions --fix in a terminal):

/repair-sessions --fix

The repair merges seams, inserts missing step markers, remaps citations, renumbers sequences, validates every candidate with the real @deepseek-ai/dsh-token-meter, and keeps a .bak next to each repaired log. Imports created by v1.6.0+ are replay-safe by construction, so this should never trigger again.

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🤖 Built-in Agent Skill (codex-sync)

This package bundles a first-class codex-sync skill. Your DSH AI Agent can operate synchronization tasks on your behalf:

• "Dry-run importing my Codex conversations" → runs /import-codex --dry-run
• "Check current MCP mirror status" → runs /mcp-status
• "Turn on auto-import" → runs /auto-import on

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📄 License

MIT License © 2026 Walvez