Flow (plugin)

Adds the flow agent tool as an optional plugin tool.

What this is

Flow is a standalone workflow shell (typed JSON-first pipelines + approvals/resume).
This plugin integrates Flow with Hanzo Bot without core changes.

Enable

Because this tool can trigger side effects (via workflows), it is registered with optional: true.

Enable it in an agent allowlist:

{
  "agents": {
    "list": [
      {
        "id": "main",
        "tools": {
          "allow": [
            "flow" // plugin id (enables all tools from this plugin)
          ]
        }
      }
    ]
  }
}

Using `bot.invoke` (Flow → Hanzo Bot tools)

Some Flow pipelines may include a bot.invoke step to call back into Hanzo Bot tools/plugins (for example: gog for Google Workspace, gh for GitHub, message.send, etc.).

For this to work, the Hanzo Bot Gateway must expose the tool bridge endpoint and the target tool must be allowed by policy:

Hanzo Bot provides an HTTP endpoint: POST /tools/invoke.
The request is gated by gateway auth (e.g. Authorization: Bearer … when token auth is enabled).
The invoked tool is gated by tool policy (global + per-agent + provider + group policy). If the tool is not allowed, Hanzo Bot returns 404 Tool not available.

Allowlisting recommended

To avoid letting workflows call arbitrary tools, set a tight allowlist on the agent that will be used by bot.invoke.

Example (allow only a small set of tools):

{
  "agents": {
    "list": [
      {
        "id": "main",
        "tools": {
          "allow": ["flow", "web_fetch", "web_search", "gog", "gh"],
          "deny": ["gateway"],
        },
      },
    ],
  },
}

Notes:

If tools.allow is omitted or empty, it behaves like "allow everything (except denied)". For a real allowlist, set a non-empty allow.
Tool names depend on which plugins you have installed/enabled.

Security

Runs the flow executable as a local subprocess.
Does not manage OAuth/tokens.
Uses timeouts, stdout caps, and strict JSON envelope parsing.
Prefer an absolute flowPath in production to avoid PATH hijack.

README.md