Extract the event model into its own crate, shared with client-core

RUST.md's recommendation item 1 starts here: Event, QuestionOption, SessionStatus, ImageRef, AttachmentRef, SeqEvent, context_tokens and context_after move to a new event-model crate so a future Rust client shares one definition with server/ instead of Events.kt's hand-kept mirror. session/driver.rs and session/transcript.rs re-export everything they used to define, so nothing downstream of either module changed. cargo test (127 passed), clippy --all-targets and fmt clean in both server/ and event-model/. Co-Authored-By: Claude Sonnet <noreply@anthropic.com>
2026-09-04 22:40:15 -04:00
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 [package]
 name = "event-model"
 version = "0.1.0"
 edition = "2024"
 # The common event model, extracted from `server/session/driver.rs` and
 # `session/transcript.rs` so a Rust client (`client-core`) can share one
 # definition with the server instead of hand-mirroring it the way
 # `app/.../Events.kt` used to. Nothing here talks to a process, a file, or a
 # socket -- it is exactly the wire shape in PLAN.md's "common event model",
 # plus the transcript envelope and the context-token rule three different
 # readers (the pump, the transcript, and a phone folding the same events)
 # have to agree on.
 [dependencies]
 serde = { version = "1", features = ["derive"] }
 # `Event::ToolStart.input` is a tool's raw call arguments, whatever shape the
 # dialect gave them -- typing it further would mean this crate knowing every
 # driver's tool schema.
 serde_json = { version = "1", features = ["float_roundtrip"] }
@@ -0,0 +1,377 @@
 //! The common event model: what a driver's process turns into before it
 //! touches the transcript or the phone (see `PLAN.md`'s "The common event
 //! model"). Extracted from `server/src/session/driver.rs` and
 //! `session/transcript.rs` on 2026-09-04 so `client-core` shares this
 //! definition instead of hand-mirroring it, which is what
 //! `app/.../Events.kt` used to do. `server/`'s `session::driver` module
 //! re-exports everything here, so nothing downstream of it had to change.
 //!
 //! What stayed behind in `server/`: the `Driver` trait, `SessionCommand`,
 //! `Unqueued` and `EventSink`. Those are how *this* server runs a session,
 //! not part of what a client reads off the wire.
 use serde::{Deserialize, Serialize};
 /// The name a session's image is stored and served under -- minted for an
 /// upload or for one a tool produced, and fetched back from
 /// `/sessions/{id}/files/{ref}`. One id both directions, so the transcript
 /// renders them identically.
 pub type ImageRef = String;
 /// The name an upload is stored and served under: an image is
 /// `<hex>.<extension>` and is an [`ImageRef`] like any other; any other file
 /// keeps its own name after the hex, `<hex>-<name>`, because the name is what
 /// the reader attached and what the session is told. Told apart by
 /// `crate::media::media_type_for`.
 pub type AttachmentRef = String;
 /// One choice offered in answer to a [`Event::Question`]. More than a label
 /// because the reader is deciding rather than confirming: what an option
 /// means, and what picking it would produce, are what decide it.
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct QuestionOption {
    pub label: String,
    /// A sentence about what this option means.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub description: Option<String>,
    /// A block to show as written -- a mockup, a diff, a config file.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub preview: Option<String>,
 }
 impl QuestionOption {
    pub fn plain(label: impl Into<String>) -> Self {
        Self {
            label: label.into(),
            description: None,
            preview: None,
        }
    }
 }
 /// Everything a session can tell the outside world. Every event is appended
 /// to the transcript with a sequence number, then fanned out to SSE
 /// subscribers, so reconnecting is just "events after seq N" -- no separate
 /// history path to drift from the live one.
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 // `rename_all` renames the variants; `rename_all_fields` renames what is
 // inside them. Both are needed and only the first is obvious: every field
 // here was one lowercase word until `pre_tokens` arrived, so a multi-word
 // field went out as snake_case, the app looked for camelCase and found
 // nothing, and the event still rendered -- as the "no counts reported" case,
 // which is a state it is allowed to be in.
 #[serde(
    tag = "type",
    rename_all = "camelCase",
    rename_all_fields = "camelCase"
 )]
 pub enum Event {
    /// What the user sent, written into the transcript by the manager (not by
    /// drivers) so every device renders the conversation from one stream.
    /// Recorded when the session reads it, which is what `MessageTaken` reports.
    UserMessage {
        /// The [`Event::MessageQueued`] this resolves, when it waited. The
        /// phone has a bubble on screen for the waiting message and needs to
        /// know *which* one this is, rather than matching on the text and
        /// clearing the wrong one when the same thing was sent twice.
        #[serde(default, skip_serializing_if = "Option::is_none")]
        id: Option<String>,
        text: String,
        /// What was attached, by the ref the files route serves. On the
        /// message rather than beside it: these used to be their own `Image`
        /// events just before, which left the phone deciding from adjacency
        /// which message an image belonged to. `images` on disk until
        /// 2026-09-03, when files joined them; the alias reads the older rows.
        #[serde(default, alias = "images", skip_serializing_if = "Vec::is_empty")]
        attachments: Vec<AttachmentRef>,
    },
    /// A message accepted from the phone that the session cannot read yet.
    ///
    /// Recorded, unlike the message itself, and that difference is the point:
    /// the message belongs in the transcript where the session read it, but
    /// something has to say it is waiting, and it has to be the server. The
    /// phone used to remember its own outgoing messages, so leaving the
    /// screen showed nothing pending when something was.
    ///
    /// Carries no row of its own; resolved by the `UserMessage` bearing the
    /// same id, as `CommandQueued` is resolved by `CommandSent`.
    MessageQueued {
        id: String,
        text: String,
        /// Carried for the same reason [`Event::UserMessage`] carries it,
        /// and it matters more here: a waiting message is on screen for as
        /// long as the turn runs, so its attachment has nowhere else to be.
        #[serde(default, alias = "images", skip_serializing_if = "Vec::is_empty")]
        attachments: Vec<AttachmentRef>,
    },
    /// A message taken out of the queue before the session read it.
    ///
    /// Recorded for the same reason `MessageQueued` is: the queue is the
    /// server's, so what is waiting has to be answerable from the transcript
    /// alone. Without it a phone that reconnects replays the `MessageQueued`
    /// and puts back a bubble nothing will ever resolve -- the `UserMessage`
    /// that normally does is exactly what is not coming.
    ///
    /// Only ever sent for a message that had not been handed over; see
    /// [`Unqueued::AlreadySent`].
    MessageDropped {
        id: String,
    },
    /// A driver has taken one of the user's messages and started reading it.
    /// The manager turns this into the `UserMessage` above, so it never
    /// reaches a phone itself.
    ///
    /// It exists because sending and being read are not the same moment. A
    /// message sent into a running turn waits, and recording it among things
    /// already read puts it in the transcript above output that predates it.
    MessageTaken {
        /// The `MessageQueued` this answers, or `None` when it never waited.
        /// Carried through onto the `UserMessage`.
        id: Option<String>,
        text: String,
        #[serde(default, alias = "images", skip_serializing_if = "Vec::is_empty")]
        attachments: Vec<AttachmentRef>,
    },
    /// Streaming assistant text; the phone renders the concatenation as
    /// markdown.
    AssistantText {
        delta: String,
    },
    ToolStart {
        id: String,
        tool: String,
        input: serde_json::Value,
    },
    ToolUpdate {
        id: String,
        output: String,
    },
    ToolEnd {
        id: String,
        output: String,
    },
    /// An image the session produced or was sent, saved under the session
    /// dir and referenced by id; the phone fetches it by URL.
    Image {
        #[serde(rename = "ref")]
        image: ImageRef,
        /// The tool call whose result carried it, when one did. A screenshot
        /// belongs under the call that took it, not floating beside it -- the
        /// reader has to pair them by position otherwise, and position is
        /// exactly what a page boundary breaks.
        #[serde(default, skip_serializing_if = "Option::is_none")]
        about: Option<String>,
    },
    /// Anything the session needs a human for: AskUserQuestion, and
    /// permission requests, are the same shape with different options.
    Question {
        id: String,
        prompt: String,
        /// A few words naming what the question is about, when the asker
        /// offered one. `None` for a permission, which is about the call
        /// above it.
        header: Option<String>,
        options: Vec<QuestionOption>,
        /// Whether several options may be chosen at once. Here rather than
        /// left for a phone to work out from the dialect underneath: how many
        /// answers a question takes is a fact about the question, and the
        /// alternative was Claude Code's tool-input schema written out a
        /// second time in Kotlin, where no other dialect could reach it.
        #[serde(default, skip_serializing_if = "std::ops::Not::not")]
        multi_select: bool,
        /// The tool call this is permission for, when it is one, so a phone
        /// can draw the ask on the tool's own row rather than as a second
        /// card repeating its input. `None` for anything not about a tool.
        #[serde(default, skip_serializing_if = "Option::is_none")]
        about: Option<String>,
    },
    /// A message another agent sent this session.
    ///
    /// Its own kind rather than a `UserMessage`, because it is not something
    /// the reader said and a transcript that renders it in their voice is
    /// claiming they did. It also explains what would otherwise be
    /// inexplicable: a session working on something nobody here asked for.
    PeerMessage {
        /// The sending session's own name, which is what the reader
        /// recognises it by -- the socket path it came from is not.
        from: String,
        text: String,
        /// The seq of the `Status::Running` that opened the turn this message
        /// started, so a reader can draw it above that turn.
        ///
        /// The CLI says nothing about a peer message until the turn's
        /// `result`, so the event is appended after everything it caused, and
        /// an append-only transcript cannot go back and insert it. Carrying
        /// the position instead keeps one order on the wire and one on screen.
        ///
        /// Filled in by the pump, the only place that knows a seq, and only
        /// where a turn was open: `None` for a message replayed by `import`,
        /// which already has it in the right place.
        #[serde(default, skip_serializing_if = "Option::is_none")]
        turn_start: Option<u64>,
    },
    /// The manager's record of a question being answered, so a rendered
    /// question card resolves on every device rather than only the one that
    /// answered.
    ///
    /// A list because a question can take several answers, and one that took
    /// one is the list of length one rather than a different shape.
    Answered {
        id: String,
        answers: Vec<String>,
    },
    Status {
        state: SessionStatus,
    },
    /// What the session is set to, as the session itself reports it.
    ///
    /// Asking for a change and having one are different things, and only this
    /// is a measurement: a model name the dialect does not know, a mode it
    /// refuses, or a driver whose model is fixed at startup all leave a
    /// request that was sent and nothing that changed. Reporting from the
    /// request put the answer on the phone before the question was answered.
    ///
    /// Either field alone, because the two are confirmed separately.
    Settings {
        #[serde(default, skip_serializing_if = "Option::is_none")]
        model: Option<String>,
        #[serde(default, skip_serializing_if = "Option::is_none")]
        permission_mode: Option<String>,
    },
    /// Per-turn token counts, where the dialect reports them.
    UsageDelta {
        /// What this turn cost: the tokens it was charged for.
        tokens: u64,
        /// What the model was holding when the turn ended -- see
        /// [`context_tokens`].
        ///
        /// Carried rather than summed by whoever is reading, because it is
        /// not a sum: context goes *down* at a compaction and a clear, so
        /// adding turns up would report a figure the session stopped being
        /// true of long ago.
        ///
        /// `None` where the dialect did not say, which every reader has to be
        /// able to draw.
        #[serde(default, skip_serializing_if = "Option::is_none")]
        context: Option<u64>,
    },
    /// A compaction that finished, and how much context it recovered.
    ///
    /// The counts are the point, and a spinner is not. They are optional
    /// because the record has shipped without them, and "the compaction
    /// happened, we don't know by how much" is a state this has to be able to
    /// say -- a plausible number would be indistinguishable from a counted one.
    Compacted {
        #[serde(default, skip_serializing_if = "Option::is_none")]
        pre_tokens: Option<u64>,
        #[serde(default, skip_serializing_if = "Option::is_none")]
        post_tokens: Option<u64>,
        /// What asked for it, in the dialect's own word -- `auto` when the
        /// session compacted on its own. Carried rather than reduced to a bool
        /// so an unrecognised trigger stays unrecognised: an automatic
        /// compaction is the one worth naming, because it explains a wait
        /// nobody asked for.
        #[serde(default, skip_serializing_if = "Option::is_none")]
        trigger: Option<String>,
    },
    /// A command the session was asked to run on itself, held because it
    /// cannot run yet. These are not messages: `/compact` and `/rename` are
    /// instructions about the session, and a session mid-turn reads a line
    /// written to it as something the model should see. So they wait, and
    /// this is what a phone draws while they do.
    CommandQueued {
        id: String,
        text: String,
    },
    /// The same command, now handed to the session. Its [`CommandQueued`]
    /// stops being pending when this arrives, matched by `id`; a command
    /// that ran immediately has only this.
    CommandSent {
        id: String,
        text: String,
    },
    /// The conversation was cleared: everything above this is still in the
    /// record but is no longer in the session's context.
    ///
    /// Nothing is deleted. A transcript is the thing a person scrolls back
    /// through, so this is a divider, not a truncation.
    ///
    /// **Load-bearing, not decorative.** For any driver that rebuilds its
    /// conversation from the transcript, this marker decides what the model
    /// is given -- dropping it, or treating it as something only the phone
    /// draws, silently puts a cleared conversation back in front of the model
    /// at full cost. Today `llama::conversation` is the only fold that reads
    /// it, which is why this is written down rather than left to be inferred
    /// from a second example that does not exist.
    Cleared,
    Error {
        message: String,
    },
 }
 /// How much the model was holding, from the three figures a turn reports:
 /// the input side only, prompt plus both cache figures. A cached token is
 /// cheaper but it is still one the model was given; output is what the turn
 /// produced rather than what continuing has to carry.
 ///
 /// One function so the definition cannot drift, because it is extracted two
 /// quite different ways -- the live translators have the usage object parsed,
 /// and `import::context_tokens` scans it out of a raw line without parsing.
 pub fn context_tokens(input: u64, cache_creation: u64, cache_read: u64) -> u64 {
    input + cache_creation + cache_read
 }
 /// The context after `event`, given what it was before.
 ///
 /// The whole rule in one place, because three readers need the same answer:
 /// the pump keeping a live session's figure, the transcript seeding it at
 /// startup, and the phone folding the same events into what it draws.
 ///
 /// The two that *lower* it are the point. A clear takes the conversation away
 /// and a compaction replaces it with a summary, so a figure measured before
 /// either stopped being true at that moment -- and carrying it forward is how
 /// a session that had just been cleared went on reporting the context it no
 /// longer had.
 ///
 /// `None` is "we don't know", which each of them can reach.
 pub fn context_after(current: Option<u64>, event: &Event) -> Option<u64> {
    match event {
        // `or`, so a turn the dialect reported no usage for leaves the last
        // measurement standing: stale by a turn, which every context figure
        // is, rather than wrong.
        Event::UsageDelta { context, .. } => context.or(current),
        Event::Compacted { post_tokens, .. } => *post_tokens,
        Event::Cleared => None,
        _ => current,
    }
 }
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub enum SessionStatus {
    Idle,
    Running,
    AwaitingInput,
    Compacting,
    Exited,
    /// There is a process recorded for this session and the machine will not
    /// say whether it is still running.
    ///
    /// Its own state rather than the nearest of the others, because both
    /// neighbours are lies with consequences: `Exited` invites starting a
    /// second process against a conversation that may already have one, and
    /// `Idle` claims a session is waiting for you when nobody has checked.
    Unknown,
 }
 /// One transcript line: an [`Event`] plus its position and time. The event
 /// is flattened so the wire shape stays one flat object.
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub struct SeqEvent {
    pub seq: u64,
    /// Epoch seconds.
    pub ts: f64,
    #[serde(flatten)]
    pub event: Event,
 }
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 6c1209b4e144a5c7
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 496a41cb49a2ef7c
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 e9c21c9094bb5e98
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 c43860ba266e2e2c
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 /home/bob/repos/ai-app-2/.claude/worktrees/agent-a30feda38122e4492/event-model/target/debug/deps/event_model-22939ccd17cf0d53.d: src/lib.rs
 /home/bob/repos/ai-app-2/.claude/worktrees/agent-a30feda38122e4492/event-model/target/debug/deps/libevent_model-22939ccd17cf0d53.rlib: src/lib.rs
 /home/bob/repos/ai-app-2/.claude/worktrees/agent-a30feda38122e4492/event-model/target/debug/deps/libevent_model-22939ccd17cf0d53.rmeta: src/lib.rs
 src/lib.rs:
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 /home/bob/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/itoa-1.0.18/src/lib.rs:
 /home/bob/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/itoa-1.0.18/src/u128_ext.rs:
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