Connect Hopper MCP

Connect Hopper MCP

Overview

Use Hopper's local stdio MCP server only after Hopper and the target document are ready. This workflow connects a local server to an agent client; it does not make Hopper output private to the client model or provider.

Read references/hopper-mcp-profile.md for the data boundary and packaging decision.

Workflow

1. Preflight the local application.

   • Start Hopper, open the intended copied artifact, and save a document checkpoint.
   • Verify the installed server command starts over stdio and the client can complete MCP initialization.

2. Configure a private client profile.

   • Point Codex or Hermes at the installed HopperMCPServer command; do not commit machine-local application paths or user configuration.
   • Keep the configuration outside Socket because Hopper is an operator-installed external application.

3. Enable a read/navigation allowlist first.

   • Allow document discovery, segment and procedure lookup, string and name search, address navigation, assembly, pseudocode, callers, callees, cross-references, and read-only comments or bookmarks.
   • Exclude document selection changes, comment writes, renames, bookmarks, patches, and bulk mutations until a saved checkpoint and explicit edit request exist.

4. Gate every disclosure.

   • Confirm which document, procedure, address range, strings, or pseudocode will enter the agent context before calling a tool.
   • Use per-tool approval when the client supports it. Treat the active model/provider as the data destination.

5. Calibrate the tool surface.

   • Record the exact discovered tools, Hopper version, client, server transport, document identity, and any unavailable tool behavior.
   • Prefer targeted queries over complete-document enumeration.

6. Escalate mutations deliberately.

   • Before enabling a mutation tool, save the document, state the exact proposed change, and preserve a before/after note with addresses and tool arguments.
   • Disable the mutation capability again when the edit is complete unless a maintained edit workflow requires it.

Guardrails

• Do not add Hopper as a checked-in Socket .mcp.json; it is an external local application, not a Socket-distributed server.
• Do not expose an entire proprietary or sensitive document by default.
• Do not assume that a successful MCP connection proves a document is loaded, analyzed, or safe to disclose.
• Use $use-hopper for interactive document work and $script-hopper-analysis for direct Python SDK work.

Output

Return the client profile state, Hopper and server identities, document checkpoint, enabled tool classes, approval/data destination decision, targeted calls, returned evidence, and any mutation escalation. For connection-only work, state preflight only; no document query or mutation performed.