Trait Channel 

pub trait Channel:
    Send
    + Sync
    + Attributable {
    // Required methods
    fn name(&self) -> &str;
    fn send<'life0, 'life1, 'async_trait>(
        &'life0 self,
        message: &'life1 SendMessage,
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             Self: 'async_trait;
    fn listen<'life0, 'async_trait>(
        &'life0 self,
        tx: Sender<ChannelMessage>,
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             Self: 'async_trait;

    // Provided methods
    fn health_check<'life0, 'async_trait>(
        &'life0 self,
    ) -> Pin<Box<dyn Future<Output = bool> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             Self: 'async_trait { ... }
    fn send_choice<'life0, 'life1, 'life2, 'life3, 'async_trait>(
        &'life0 self,
        recipient: &'life1 str,
        prompt: &'life2 str,
        options: &'life3 [(String, String)],
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait,
             'life3: 'async_trait,
             Self: 'async_trait { ... }
    fn start_typing<'life0, 'life1, 'async_trait>(
        &'life0 self,
        _recipient: &'life1 str,
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             Self: 'async_trait { ... }
    fn stop_typing<'life0, 'life1, 'async_trait>(
        &'life0 self,
        _recipient: &'life1 str,
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             Self: 'async_trait { ... }
    fn supports_draft_updates(&self) -> bool { ... }
    fn supports_outbound_send(&self) -> bool { ... }
    fn self_handle(&self) -> Option<String> { ... }
    fn self_addressed_mention(&self) -> Option<String> { ... }
    fn drop_self_messages(&self, msg: &ChannelMessage) -> bool { ... }
    fn forge_request<'life0, 'async_trait>(
        &'life0 self,
        _request: ForgeApiRequest,
    ) -> Pin<Box<dyn Future<Output = Result<ForgeApiResponse, Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             Self: 'async_trait { ... }
    fn is_direct_message(&self, _msg: &ChannelMessage) -> bool { ... }
    fn supports_multi_message_streaming(&self) -> bool { ... }
    fn multi_message_delay_ms(&self) -> u64 { ... }
    fn send_draft<'life0, 'life1, 'async_trait>(
        &'life0 self,
        _message: &'life1 SendMessage,
    ) -> Pin<Box<dyn Future<Output = Result<Option<String>, Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             Self: 'async_trait { ... }
    fn update_draft<'life0, 'life1, 'life2, 'life3, 'async_trait>(
        &'life0 self,
        _recipient: &'life1 str,
        _message_id: &'life2 str,
        _text: &'life3 str,
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait,
             'life3: 'async_trait,
             Self: 'async_trait { ... }
    fn update_draft_progress<'life0, 'life1, 'life2, 'life3, 'async_trait>(
        &'life0 self,
        _recipient: &'life1 str,
        _message_id: &'life2 str,
        _text: &'life3 str,
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait,
             'life3: 'async_trait,
             Self: 'async_trait { ... }
    fn finalize_draft<'life0, 'life1, 'life2, 'life3, 'async_trait>(
        &'life0 self,
        _recipient: &'life1 str,
        _message_id: &'life2 str,
        _text: &'life3 str,
        _suppress_voice: bool,
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait,
             'life3: 'async_trait,
             Self: 'async_trait { ... }
    fn cancel_draft<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        _recipient: &'life1 str,
        _message_id: &'life2 str,
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait,
             Self: 'async_trait { ... }
    fn add_reaction<'life0, 'life1, 'life2, 'life3, 'async_trait>(
        &'life0 self,
        _channel_id: &'life1 str,
        _message_id: &'life2 str,
        _emoji: &'life3 str,
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait,
             'life3: 'async_trait,
             Self: 'async_trait { ... }
    fn remove_reaction<'life0, 'life1, 'life2, 'life3, 'async_trait>(
        &'life0 self,
        _channel_id: &'life1 str,
        _message_id: &'life2 str,
        _emoji: &'life3 str,
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait,
             'life3: 'async_trait,
             Self: 'async_trait { ... }
    fn pin_message<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        _channel_id: &'life1 str,
        _message_id: &'life2 str,
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait,
             Self: 'async_trait { ... }
    fn unpin_message<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        _channel_id: &'life1 str,
        _message_id: &'life2 str,
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait,
             Self: 'async_trait { ... }
    fn redact_message<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        _channel_id: &'life1 str,
        _message_id: &'life2 str,
        _reason: Option<String>,
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait,
             Self: 'async_trait { ... }
    fn create_room<'life0, 'life1, 'async_trait>(
        &'life0 self,
        _options: &'life1 RoomCreationOptions,
    ) -> Pin<Box<dyn Future<Output = Result<String, Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             Self: 'async_trait { ... }
    fn invite_user<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        _room_id: &'life1 str,
        _user_id: &'life2 str,
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait,
             Self: 'async_trait { ... }
    fn request_approval<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        _recipient: &'life1 str,
        _request: &'life2 ChannelApprovalRequest,
    ) -> Pin<Box<dyn Future<Output = Result<Option<ChannelApprovalResponse>, Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait,
             Self: 'async_trait { ... }
    fn request_approval_attributed<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        recipient: &'life1 str,
        request: &'life2 ChannelApprovalRequest,
    ) -> Pin<Box<dyn Future<Output = Result<Option<AttributedApprovalResponse>, Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait,
             Self: 'async_trait { ... }
    fn send_gate_prompt<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        _recipient: &'life1 str,
        _prompt: &'life2 ChannelGatePrompt,
    ) -> Pin<Box<dyn Future<Output = Result<bool, Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait,
             Self: 'async_trait { ... }
    fn finalize_gate_prompt<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        _reference: &'life1 str,
        _outcome: &'life2 str,
    ) -> Pin<Box<dyn Future<Output = Result<bool, Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait,
             Self: 'async_trait { ... }
    fn request_choice<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        _question: &'life1 str,
        _choices: &'life2 [String],
        _timeout: Duration,
    ) -> Pin<Box<dyn Future<Output = Result<Option<String>, Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait,
             Self: 'async_trait { ... }
    fn request_multi_choice<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        _question: &'life1 str,
        _choices: &'life2 [String],
        _min_items: usize,
        _max_items: usize,
        _timeout: Duration,
    ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<String>>, Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait,
             Self: 'async_trait { ... }
    fn supports_free_form_ask(&self) -> bool { ... }
}

Core channel trait — implement for any messaging platform.

Every Channel is Attributable: the orchestrator’s spawn site opens attribution_span!(&*ch) so log emissions from within listen() / send() inherit channel = <type>.<alias>.

Required Methods

fn name(&self) -> &str

Human-readable channel name

fn send<'life0, 'life1, 'async_trait>( &'life0 self, message: &'life1 SendMessage, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, Self: 'async_trait,

Send a message through this channel

fn listen<'life0, 'async_trait>( &'life0 self, tx: Sender<ChannelMessage>, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, Self: 'async_trait,

Start listening for incoming messages (long-running)

Provided Methods

fn health_check<'life0, 'async_trait>( &'life0 self, ) -> Pin<Box<dyn Future<Output = bool> + Send + 'async_trait>>

where 'life0: 'async_trait, Self: 'async_trait,

Check if channel is healthy

fn send_choice<'life0, 'life1, 'life2, 'life3, 'async_trait>( &'life0 self, recipient: &'life1 str, prompt: &'life2 str, options: &'life3 [(String, String)], ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, 'life3: 'async_trait, Self: 'async_trait,

Send a discrete-choice prompt with options.

Each (callback_id, label) pair represents one choice. Whether the callback_id round-trips on inbound is channel-specific:

• WhatsApp Cloud preserves the callback_id exactly — it appears as interactive.button_reply.id / interactive.list_reply.id, surfaced as [choice]<callback_id> in the inbound ChannelMessage.content.
• Signal uses native polls. Real signal-cli pollVote payloads round-trip selected option indexes, surfaced as [choice-index]N with a 1-based index. Some alternate pollAnswer payloads may include selected titles and surface as [choice]<label>, but callers needing stable callback ids should maintain a side map keyed by poll option index.
• Default text fallback (Matrix, SMS, IRC, mock) renders a numbered list with a “reply with name or number” hint and relies on the consumer’s own matcher to resolve the user’s text reply against the option list.

options.is_empty() is treated as “send the prompt as plain text with no choices” rather than rendering an empty selection hint; if prompt is also empty the call is a no-op (returns Ok(())).

prompt is the question / title; rendered ABOVE the options.

fn start_typing<'life0, 'life1, 'async_trait>( &'life0 self, _recipient: &'life1 str, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, Self: 'async_trait,

Signal that the bot is processing a response (e.g. “typing” indicator).

fn stop_typing<'life0, 'life1, 'async_trait>( &'life0 self, _recipient: &'life1 str, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, Self: 'async_trait,

Stop any active typing indicator.

fn supports_draft_updates(&self) -> bool

Whether this channel supports progressive message updates via draft edits.

fn supports_outbound_send(&self) -> bool

Whether send actually delivers a message OUTBOUND on this channel. Default true. An INBOUND-ONLY transport (e.g. an AMQP trigger source whose send is a deliberate no-op that returns Ok) overrides this to false, so a surface that must genuinely deliver - such as the SOP approval route adapter - can refuse to route to it (and report the misconfiguration) instead of silently succeeding without sending anything.

fn self_handle(&self) -> Option<String>

Self-loop guard for multi-agent runs: the bot’s own handle/identity on this channel, so the orchestrator can drop inbound events whose sender matches. A bot must never respond to its own messages, even if a misconfigured peer group lists the bot’s handle as an external peer.

Channels that handle inbound traffic must override this. The default None disables both layers of the self-loop guard (drop_self_messages here and the agent-loop fallback), leaving the channel unprotected from looping on its own outbound. Outbound-only channels can keep the default.

fn self_addressed_mention(&self) -> Option<String>

The exact form the bot expects when addressed by users on this channel (e.g. Discord <@snowflake>, Telegram @bot_username). Returned verbatim into the per-channel system prompt. Default None for channels with no inbound mention concept. Channels that override self_handle should usually override this too.

fn drop_self_messages(&self, msg: &ChannelMessage) -> bool

Whether the orchestrator should drop an inbound message as self-authored (multi-agent self-loop guard). Default compares msg.sender against Self::self_handle case-insensitively after stripping a leading @ from each side. Override only for platforms whose identity comparison is non-string.

fn forge_request<'life0, 'async_trait>( &'life0 self, _request: ForgeApiRequest, ) -> Pin<Box<dyn Future<Output = Result<ForgeApiResponse, Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, Self: 'async_trait,

fn is_direct_message(&self, _msg: &ChannelMessage) -> bool

Whether an inbound message is a direct one-to-one conversation with the bot. A DM is definitionally addressed to the bot, so the orchestrator skips the reply-intent classifier and goes straight to the tool-capable agent turn. Default false: channels that cannot prove a one-to-one context keep the classifier precheck.

fn supports_multi_message_streaming(&self) -> bool

Whether this channel supports multi-message streaming delivery.

fn multi_message_delay_ms(&self) -> u64

Minimum delay (ms) between sending each paragraph in multi-message mode.

fn send_draft<'life0, 'life1, 'async_trait>( &'life0 self, _message: &'life1 SendMessage, ) -> Pin<Box<dyn Future<Output = Result<Option<String>, Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, Self: 'async_trait,

Send an initial draft message. Returns a platform-specific message ID for later edits.

fn update_draft<'life0, 'life1, 'life2, 'life3, 'async_trait>( &'life0 self, _recipient: &'life1 str, _message_id: &'life2 str, _text: &'life3 str, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, 'life3: 'async_trait, Self: 'async_trait,

Update a previously sent draft message with new accumulated content.

fn update_draft_progress<'life0, 'life1, 'life2, 'life3, 'async_trait>( &'life0 self, _recipient: &'life1 str, _message_id: &'life2 str, _text: &'life3 str, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, 'life3: 'async_trait, Self: 'async_trait,

Show a progress/status update (e.g. tool execution status).

fn finalize_draft<'life0, 'life1, 'life2, 'life3, 'async_trait>( &'life0 self, _recipient: &'life1 str, _message_id: &'life2 str, _text: &'life3 str, _suppress_voice: bool, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, 'life3: 'async_trait, Self: 'async_trait,

Finalize a draft with the complete response (e.g. apply Markdown formatting). suppress_voice forces text delivery even on voice-only peers.

fn cancel_draft<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, _recipient: &'life1 str, _message_id: &'life2 str, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, Self: 'async_trait,

Cancel and remove a previously sent draft message if the channel supports it.

fn add_reaction<'life0, 'life1, 'life2, 'life3, 'async_trait>( &'life0 self, _channel_id: &'life1 str, _message_id: &'life2 str, _emoji: &'life3 str, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, 'life3: 'async_trait, Self: 'async_trait,

Add a reaction (emoji) to a message.

fn remove_reaction<'life0, 'life1, 'life2, 'life3, 'async_trait>( &'life0 self, _channel_id: &'life1 str, _message_id: &'life2 str, _emoji: &'life3 str, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, 'life3: 'async_trait, Self: 'async_trait,

Remove a reaction (emoji) from a message previously added by this bot.

fn pin_message<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, _channel_id: &'life1 str, _message_id: &'life2 str, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, Self: 'async_trait,

Pin a message in the channel.

fn unpin_message<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, _channel_id: &'life1 str, _message_id: &'life2 str, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, Self: 'async_trait,

Unpin a previously pinned message.

fn redact_message<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, _channel_id: &'life1 str, _message_id: &'life2 str, _reason: Option<String>, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, Self: 'async_trait,

Redact (delete) a message from the channel.

fn create_room<'life0, 'life1, 'async_trait>( &'life0 self, _options: &'life1 RoomCreationOptions, ) -> Pin<Box<dyn Future<Output = Result<String, Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, Self: 'async_trait,

Create a new platform room/conversation when the channel supports it.

fn invite_user<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, _room_id: &'life1 str, _user_id: &'life2 str, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, Self: 'async_trait,

Invite a user to an existing platform room/conversation.

fn request_approval<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, _recipient: &'life1 str, _request: &'life2 ChannelApprovalRequest, ) -> Pin<Box<dyn Future<Output = Result<Option<ChannelApprovalResponse>, Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, Self: 'async_trait,

Request interactive tool-call approval from the channel operator.

Returns Ok(Some(response)) when the operator answers within the channel’s configured approval_timeout_secs; timeouts surface as Deny. Returns Ok(None) only for channels that do not implement the prompt at all — the caller falls back to its default policy (typically auto-deny).

fn request_approval_attributed<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, recipient: &'life1 str, request: &'life2 ChannelApprovalRequest, ) -> Pin<Box<dyn Future<Output = Result<Option<AttributedApprovalResponse>, Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, Self: 'async_trait,

Like Channel::request_approval, but also reports which back-channel produced the decision when this channel fans the request out. Default delegates to Channel::request_approval with decided_by: None; only a fan-out bridge needs to override.

fn send_gate_prompt<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, _recipient: &'life1 str, _prompt: &'life2 ChannelGatePrompt, ) -> Pin<Box<dyn Future<Output = Result<bool, Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, Self: 'async_trait,

Present a long-lived, out-of-band gate prompt (e.g. a parked SOP approval) on this channel, rendered natively — an embed with one button per choice on Discord, an inline keyboard on Telegram, and so on.

UNLIKE Channel::request_approval this does NOT wait for the answer: the prompt outlives the call (and daemon restarts). The choice comes back through the channel’s normal INBOUND path — a component click (stamped with an internal sop.gate: marker by the channel’s own interaction producer, never derivable from message text) or a plain <choice> <reference> text reply — which the orchestrator resolves against the parked gate.

Default Ok(false) = “no native prompt on this channel”; the caller then falls back to a plain text notice carrying the reply instructions.

fn finalize_gate_prompt<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, _reference: &'life1 str, _outcome: &'life2 str, ) -> Pin<Box<dyn Future<Output = Result<bool, Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, Self: 'async_trait,

Mark a previously sent gate prompt as resolved: strip its interactive controls and replace the body with outcome (e.g. “Approved by @user — run resumed”), so a decided gate cannot be clicked again and the decision is visible in place. reference is the same correlation key the prompt was sent with. Best-effort: Ok(false) when this channel has nothing to finalize (no native prompt, or the mapping was lost to a restart) — the gate state itself is never affected.

fn request_choice<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, _question: &'life1 str, _choices: &'life2 [String], _timeout: Duration, ) -> Pin<Box<dyn Future<Output = Result<Option<String>, Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, Self: 'async_trait,

Ask the user a multiple-choice question and return the chosen option’s text.

Returns Ok(Some(answer)) if the channel handled the question natively (e.g. ACP elicitation/create with a single-select enum schema, or the legacy session/request_permission fallback for older ACP clients; Telegram inline keyboard; etc.). Returns Ok(None) to signal the caller should fall back to the generic send + listen flow. Default impl returns None.

Free-form (no-choices) questions are not modeled by this method. Multiple-choice support landed via ACP elicitation/create (see the ACP elicitation RFD: https://agentclientprotocol.com/rfds/elicitation); free-form text is tracked under that spec’s Phase 2.

fn request_multi_choice<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, _question: &'life1 str, _choices: &'life2 [String], _min_items: usize, _max_items: usize, _timeout: Duration, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<String>>, Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, Self: 'async_trait,

fn supports_free_form_ask(&self) -> bool

Whether this channel can answer free-form (no-choices) ask_user questions via the standard send + listen flow. Channels that only handle structured choices return false so callers fail fast with a useful error instead of timing out on listen.

Implementations on Foreign Types

impl Channel for RpcApprovalChannel

fn supports_free_form_ask(&self) -> bool

Free-form text elicitation is Phase 2 of the elicitation rollout — the same answer as AcpChannel. Until that lands, tools like ask_user (with no choices) and escalate_to_human (with wait_for_response) fail fast on the Code tab.

fn name(&self) -> &str

fn send<'life0, 'life1, 'async_trait>( &'life0 self, _message: &'life1 SendMessage, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, RpcApprovalChannel: 'async_trait,

fn listen<'life0, 'async_trait>( &'life0 self, _tx: Sender<ChannelMessage>, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, RpcApprovalChannel: 'async_trait,

fn request_approval<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, recipient: &'life1 str, request: &'life2 ChannelApprovalRequest, ) -> Pin<Box<dyn Future<Output = Result<Option<ChannelApprovalResponse>, Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, RpcApprovalChannel: 'async_trait,

fn request_choice<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, question: &'life1 str, choices: &'life2 [String], timeout: Duration, ) -> Pin<Box<dyn Future<Output = Result<Option<String>, Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, RpcApprovalChannel: 'async_trait,

fn request_multi_choice<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, question: &'life1 str, choices: &'life2 [String], min_items: usize, max_items: usize, timeout: Duration, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<String>>, Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, RpcApprovalChannel: 'async_trait,

Implementors

impl Channel for AcpChannel

impl Channel for CliChannel

impl Channel for DiscordChannel

impl Channel for EmailChannel

impl Channel for FilesystemChannel

impl Channel for GmailPushChannel

impl Channel for PacedChannel

impl Channel for TelegramChannel

impl Channel for WebhookChannel