# Extensions

Extensions add capabilities to nanobot without modifying the agent loop. One
extension package can contribute tools, commands, hooks, skills, channels,
providers, MCP servers, or WebUI surfaces. nanobot also recognizes compatible
Pi packages and OpenClaw plugins, with capability-by-capability diagnostics.

Use this page to install and manage extensions. To publish one, read
[Extension Authoring](./extension-authoring.md). For the internal design, read
[Extension System](./extension-system.md).

## Install Safely

The WebUI **Extensions** page and the `nanobot extensions` commands use the same
local extension store. The safe lifecycle is:

1. Find or install a package.
2. Inspect its source, runtime, dependencies, requested permissions, and
   diagnostics.
3. Grant only the permissions you understand.
4. Mark the package trusted.
5. Enable it.

Installation does not grant trust. An installed package remains visible but
inactive until it is enabled, trusted, has all requested permissions, and
passes dependency checks.

### WebUI

Open **Extensions** in the sidebar:

- **Installed** manages packages in `~/.nanobot/extensions/`.
- **Discover** searches npm packages marked for nanobot, Pi, or OpenClaw.
- **Built in** shows native nanobot capabilities projected into the same
  catalog. Built-in entries are informational and are not uninstallable.

Select an entry to see its contributions, dependencies, permission reasons,
source, compatibility notices, and activation errors. Trust and permission
controls are intentionally separate.

### CLI

```bash
# Search all supported npm ecosystems
nanobot extensions search "memory"

# Search one compatibility ecosystem
nanobot extensions search "review" --ecosystem pi

# Install without trusting the package
nanobot extensions install @scope/package

# Inspect before activation
nanobot extensions inspect pi.scope.package

# Grant exactly the requested host permissions
nanobot extensions permissions pi.scope.package network.http workspace.read

# Trust and enable
nanobot extensions trust pi.scope.package
nanobot extensions enable pi.scope.package
```

Install from Git or a local directory when the package is not published:

```bash
nanobot extensions install https://github.com/acme/nanobot-tool.git --kind git
nanobot extensions install ./my-extension --kind local
```

Local-directory installation is available only to local WebUI requests. Remote
browser clients cannot ask the gateway to read an arbitrary server path.

## Sources and Scopes

Extensions can come from three scopes:

| Scope | Typical source | Behavior |
|---|---|---|
| Built in | nanobot package | Trusted by construction; shown for ownership and diagnostics |
| User | `~/.nanobot/extensions/` | Installed and governed through the WebUI or CLI |
| Workspace | `<workspace>/.nanobot/extensions/` | Project-local code; controlled by workspace trust policy |

When the same extension ID exists in multiple scopes, the nearest scope wins:
workspace over user, user over built in. A contribution cannot silently replace
another extension's contribution. Explicit replacement metadata and sufficient
scope are required.

## Pi and OpenClaw Packages

nanobot reads native Pi and OpenClaw package metadata and runs supported
JavaScript or TypeScript entries in a Node.js sidecar. Compatibility is not
all-or-nothing:

- Tools, slash commands, and supported lifecycle observation hooks can run.
- Provider-like registrations and several host-specific capabilities may be
  cataloged but not executable.
- Terminal UI, session-tree, renderer, shortcut, and model-control APIs do not
  have equivalent nanobot host surfaces.
- Every degraded or unsupported registration appears in diagnostics.

Check the [compatibility matrix](./extension-authoring.md#compatibility-matrix)
before depending on a package. A package appearing in search results means its
metadata is recognizable, not that every upstream API is implemented.

## Trust and Permissions

An extension is executable code. Review it with the same care as a Python or npm
dependency.

- **Enabled** says the extension may activate.
- **Trusted** says you approve executing its code.
- **Granted permissions** are exact host capabilities approved for that
  extension.
- **Dependencies** must be present before activation.

Permissions are host policy, not an operating-system sandbox. A trusted native
Python extension executes in the nanobot process. A Pi or OpenClaw extension
executes in a separate Node.js process, which improves failure isolation but is
not a strong OS security boundary. Use containers or another OS sandbox for
untrusted third-party code.

npm installation uses lifecycle scripts disabled. This prevents package
`preinstall` and `postinstall` scripts from running during installation, but the
extension entry itself will run after you explicitly trust and enable it.

## Configuration

Most users should manage installed packages in the WebUI or CLI. Advanced
deployments can also define extension policy in `~/.nanobot/config.json`:

```json
{
  "extensions": {
    "enabled": true,
    "paths": ["/opt/nanobot/extensions"],
    "allow": [],
    "deny": ["acme.blocked"],
    "workspaceTrust": "ask",
    "entries": {
      "acme.review": {
        "enabled": true,
        "trusted": true,
        "permissions": ["workspace.read"],
        "config": {
          "mode": "strict"
        }
      }
    }
  }
}
```

Config entries do not rewrite the installation registry. See
[Configuration](./configuration.md#extensions) for exact fields.

## Diagnose an Inactive Extension

Start with:

```bash
nanobot extensions list
nanobot extensions inspect <extension-id>
```

Common causes:

| State or diagnostic | What to do |
|---|---|
| Untrusted | Review the package, then use `trust` |
| Requested permission pending | Grant the exact requested permission set |
| Disabled | Use `enable` or remove it from `extensions.deny` |
| Missing dependency | Install the named package, executable, environment variable, or extension |
| Contribution conflict | Disable one owner or use an explicit replacement from an appropriate scope |
| Compatibility notice | Read which upstream API was translated, degraded, or unsupported |
| Activation failed | Check the package entry, runtime dependency, and gateway logs |

Policy changes reload the active extension host. A broken extension becomes a
diagnostic and does not prevent unrelated extensions from being discovered.

## Remove an Extension

```bash
nanobot extensions disable <extension-id>
nanobot extensions uninstall <extension-id>
```

Uninstall removes the user-scope package and its local policy record. It does
not remove a built-in capability or a separately configured workspace copy.