Enum InboundKind 

#[non_exhaustive]
pub enum InboundKind {
    ExternalUser,
    InternalSystem,
    InterSession,
}

Binding context propagated to tool calls so extensions and MCP servers can route per-(channel, account_id, agent_id) tuple without re-deriving it from each tool call’s payload.

Serialised under _meta.nexo.binding in JSON-RPC tools/call (extensions ignore unknown fields) and as the meta block of MCP call_tool_with_meta.

agent_id is mandatory; the rest are Option because some dispatch paths (delegation receive, heartbeat bootstrap, tests) have no binding match — None is the correct state, not a sentinel string.

mcp_channel_source is populated when the inbound that triggered this turn arrived via an MCP channel server (e.g., "slack", "telegram"). Lets a tool distinguish “telegram-binding answered via MCP slack server” from “telegram-binding answered via native Telegram plugin” while still seeing the same (channel, account_id) binding tuple. Matches the goal_turns.source = "channel:slack" audit column. 3-way discriminator for the origin of an agent turn.

Mirrors the trichotomy used by inbound provenance tracking (external_user / inter_session / internal_system) so microapps can branch handlers on the message origin without re-deriving it from sender_id presence alone.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

ExternalUser

External end-user message via a channel plugin (whatsapp, telegram, email, …), webhook receiver, or MCP-channel server. sender_id is typically populated.

InternalSystem

System-injected turn (heartbeat tick, scheduler fire, event-subscriber binding declared as internal_system). sender_id is None.

InterSession

Inter-agent delegation receive. origin_session_id carries the calling agent’s session.

Trait Implementations

impl Clone for InboundKind

fn clone(&self) -> InboundKind

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for InboundKind

impl Debug for InboundKind

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for InboundKind

fn deserialize<__D>( __deserializer: __D, ) -> Result<InboundKind, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for InboundKind

impl PartialEq for InboundKind

fn eq(&self, other: &InboundKind) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for InboundKind

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for InboundKind