---
summary: "Experimental channel ingress API for inbound message authorization"
read_when:
  - Building or migrating a messaging channel plugin
  - Changing DM or group allowlists, route gates, command auth, event auth, or mention activation
  - Reviewing channel ingress redaction or SDK compatibility boundaries
title: "Channel ingress API"
sidebarTitle: "Channel Ingress"
---

# Channel ingress API

Channel ingress is the experimental access-control boundary for inbound channel
events. Use `mnemo/plugin-sdk/channel-ingress-runtime` for receive paths.
The older `mnemo/plugin-sdk/channel-ingress` subpath stays exported as a
deprecated compatibility facade for third-party plugins.

Plugins own platform facts and side effects. Core owns generic policy: DM/group
allowlists, pairing-store DM entries, route gates, command gates, event auth,
mention activation, redacted diagnostics, and admission.

## Runtime Resolver

```ts
import {
  defineStableChannelIngressIdentity,
  resolveChannelMessageIngress,
} from "mnemo/plugin-sdk/channel-ingress-runtime";

const identity = defineStableChannelIngressIdentity({
  key: "platform-user-id",
  normalize: normalizePlatformUserId,
  sensitivity: "pii",
});

const result = await resolveChannelMessageIngress({
  channelId: "my-channel",
  accountId,
  identity,
  subject: { stableId: platformUserId },
  conversation: { kind: isGroup ? "group" : "direct", id: conversationId },
  event: { kind: "message", authMode: "inbound", mayPair: !isGroup },
  policy: {
    dmPolicy: config.dmPolicy,
    groupPolicy: config.groupPolicy,
    groupAllowFromFallbackToAllowFrom: true,
  },
  allowFrom: config.allowFrom,
  groupAllowFrom: config.groupAllowFrom,
  accessGroups: cfg.accessGroups,
  route,
  readStoreAllowFrom,
  command: hasControlCommand ? { allowTextCommands: true, hasControlCommand } : undefined,
});
```

Do not precompute effective allowlists, command owners, or command groups. The
resolver derives them from raw allowlists, store callbacks, route descriptors,
access groups, policy, and conversation kind.

## Result

Bundled plugins should consume modern projections directly:

- `ingress`: ordered gate decision and admission
- `senderAccess`: sender/conversation authorization only
- `routeAccess`: route and route-sender projection
- `commandAccess`: command authorization; false when no command gate ran
- `activationAccess`: mention/activation result

Event authorization remains available on the ordered `ingress.graph` and the
decisive `ingress.reasonCode`; no separate event projection is emitted.

Deprecated third-party SDK helpers may rebuild older shapes internally. New
bundled receive paths should not translate modern results back into local DTOs.

## Access Groups

`accessGroup:<name>` entries stay redacted. Core resolves static
`message.senders` groups itself and calls `resolveAccessGroupMembership` only
for dynamic groups that require a platform lookup. Missing, unsupported, and
failed groups fail closed.

## Event Modes

| `authMode`       | Meaning                                          |
| ---------------- | ------------------------------------------------ |
| `inbound`        | normal inbound sender gates                      |
| `command`        | command gates for callbacks or scoped buttons    |
| `origin-subject` | actor must match the original message subject    |
| `route-only`     | route gates only for route-scoped trusted events |
| `none`           | plugin-owned internal events bypass shared auth  |

Use `mayPair: false` for reactions, buttons, callbacks, and native commands.

## Routes And Activation

Use route descriptors for room, topic, guild, thread, or nested route policy:

```ts
route: {
  id: "room",
  allowed: roomAllowed,
  enabled: roomEnabled,
  senderPolicy: "replace",
  senderAllowFrom: roomAllowFrom,
  blockReason: "room_sender_not_allowlisted",
}
```

Use `channelIngressRoutes(...)` when a plugin has several optional route
descriptors; it filters disabled branches while keeping route facts generic and
ordered by each descriptor's `precedence`.

Mention gating is an activation gate. A mention miss returns
`admission: "skip"` so the turn kernel does not process an observe-only turn.
Most channels should leave activation after sender and command gates. Public
chat surfaces that must quiet non-mentioned traffic before sender allowlist
noise can opt into `activation.order: "before-sender"` when text-command
bypass is disabled. Channels with implicit activation, such as replies in bot
threads, can pass `activation.allowedImplicitMentionKinds`; the projected
`activationAccess.shouldBypassMention` then reports when command or implicit
activation bypassed an explicit mention.

## Redaction

Raw sender values and raw allowlist entries are resolver input only. They must
not appear in resolved state, decisions, diagnostics, snapshots, or
compatibility facts. Use opaque subject ids, entry ids, route ids, and
diagnostic ids.

## Verification

```bash
pnpm test src/channels/message-access/message-access.test.ts src/plugin-sdk/channel-ingress-runtime.test.ts
pnpm plugin-sdk:api:check
```
