Feature: add DSH (DeepSeek Harness) as a serena-hooks client

[lplnb-del]

Is your feature request related to a problem? Please describe.

Serena works with DSH (DeepSeek Harness, https://github.com/deepseek-ai/deepseek-harness) today via manual MCP config — registering the Serena MCP server through DSH's @deepseek-ai/dsh-mcp-client plugin (~/.dsh/cordis.patch.yml). However, serena-hooks does not support DSH as a --client, so none of the lifecycle hooks (activate, remind, cleanup, auto-approve) can be wired up for DSH sessions.

Describe the solution you'd like

Add dsh to the --client enum in serena-hooks (currently claude-code|codebuddy|vscode|codex|grok), so these commands work:

serena-hooks activate --client dsh
serena-hooks remind --client dsh
serena-hooks cleanup --client dsh
serena-hooks auto-approve --client dsh

DSH supports Claude Code-compatible hooks via its @deepseek-ai/dsh-hooks-claude-code bridge plugin, which reads a Claude Code-style hooks.json. It supports these events: SessionStart, UserPromptSubmit, PreToolUse, PostToolUse, Stop, SubagentStart, SubagentStop (note: no SessionEnd). These map onto Serena's hooks as:

Serena hook	DSH event	Notes
activate	SessionStart	inject "activate project + read instructions"
remind	PreToolUse	nudge toward symbolic tools on grep/read overuse
auto-approve	PreToolUse	auto-approve Serena tool calls
cleanup	Stop	closest available event; DSH has no SessionEnd (same mapping ZCode uses)

DSH hook config format (written to ~/.dsh/hooks.json, enabled via @deepseek-ai/dsh-hooks-claude-code with configPath in cordis.patch.yml):

{
  "SessionStart": [
    { "matcher": "", "hooks": [ { "type": "command", "command": "serena-hooks activate --client dsh" } ] }
  ],
  "PreToolUse": [
    { "matcher": "", "hooks": [ { "type": "command", "command": "serena-hooks remind --client dsh" } ] },
    { "matcher": "mcp__serena__*", "hooks": [ { "type": "command", "command": "serena-hooks auto-approve --client dsh" } ] }
  ],
  "Stop": [
    { "matcher": "", "hooks": [ { "type": "command", "command": "serena-hooks cleanup --client dsh" } ] }
  ]
}

Describe alternatives you've considered

• Manually replicating the hook behavior via DSH's .agents/ instructions (current workaround — works, but no automatic activation/reminders).
• Waiting on DSH to add a SessionEnd event so cleanup can map 1:1 like Claude Code — but Stop is a workable approximation today, matching the existing ZCode mapping.

Additional context

• DSH repo: https://github.com/deepseek-ai/deepseek-harness
• DSH hooks bridge: packages/hooks/hooks-claude-code (@deepseek-ai/dsh-hooks-claude-code)
• Serena MCP config on DSH (for reference):

  - insert:
      - id: mcp-serena
        name: '@deepseek-ai/dsh-mcp-client'
        config:
          serverName: serena
          transport: stdio
          command: serena
          args: [start-mcp-server, --context, agent, --project-from-cwd]

• This mirrors the existing ZCode feature request (Feature: add ZCode (Z.ai) as a serena-hooks client #1837) and Grok/CodeBuddy/Devin precedent for adding a new --client.

[MischaPanch]

We'd welcome a PR on this