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+# PR 1: `fabro-chat` Crate Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Create `lib/crates/fabro-chat/` with the `ChatService` and `ChatEventContext` traits, all shared types, and test-support helpers — the foundation every subsequent PR builds on.
+
+**Architecture:** A new crate between `fabro-interview` and the provider crates. Defines the trait contract only — no implementations, no server wiring. Mirrors the `fabro-sandbox` / `SandboxProvider` pattern exactly.
+
+**Tech Stack:** Rust, `async-trait`, `bytes`, `http` (via `axum::http` re-exports), `serde`, `strum`, `insta` (snapshot tests in dev-deps)
+
+**Spec:** `docs/superpowers/specs/2026-06-13-chat-service-trait-and-providers.md` — §`fabro-chat` — Trait and Shared Types
+
+---
+
+## File Structure
+
+**Create:**
+- `lib/crates/fabro-chat/Cargo.toml`
+- `lib/crates/fabro-chat/src/lib.rs` — public re-exports
+- `lib/crates/fabro-chat/src/service.rs` — `ChatService` trait
+- `lib/crates/fabro-chat/src/context.rs` — `ChatEventContext` trait
+- `lib/crates/fabro-chat/src/types.rs` — `ChatProviderKind`, `AnswerSubmission`, `WebhookOutcome`
+- `lib/crates/fabro-chat/src/test_support.rs` — `MockChatEventContext`, `assert_chat_service_contract`
+
+---
+
+### Task 1: Create the crate skeleton
+
+**Files:**
+- Create: `lib/crates/fabro-chat/Cargo.toml`
+- Create: `lib/crates/fabro-chat/src/lib.rs`
+
+- [ ] **Step 1: Write `Cargo.toml`**
+
+```toml
+[package]
+name = "fabro-chat"
+edition.workspace = true
+version.workspace = true
+publish = false
+license.workspace = true
+description = "ChatService trait and shared types for Fabro chat integrations"
+
+[features]
+test-support = []
+
+[lib]
+doctest = false
+
+[lints]
+workspace = true
+
+[dependencies]
+async-trait.workspace = true
+bytes.workspace = true
+serde.workspace = true
+strum.workspace = true
+fabro-types = { path = "../fabro-types" }
+fabro-interview = { path = "../fabro-interview" }
+
+[dev-dependencies]
+tokio = { workspace = true, features = ["test-util", "macros"] }
+serde_json.workspace = true
+```
+
+- [ ] **Step 2: Write `src/lib.rs` with empty module declarations**
+
+```rust
+pub mod context;
+pub mod service;
+pub mod types;
+
+#[cfg(any(test, feature = "test-support"))]
+pub mod test_support;
+
+pub use context::ChatEventContext;
+pub use service::ChatService;
+pub use types::{AnswerSubmission, ChatProviderKind, WebhookOutcome};
+```
+
+- [ ] **Step 3: Create placeholder source files so the crate compiles**
+
+Create `lib/crates/fabro-chat/src/context.rs` with empty content:
+```rust
+```
+
+Create `lib/crates/fabro-chat/src/service.rs` with empty content:
+```rust
+```
+
+Create `lib/crates/fabro-chat/src/types.rs` with empty content:
+```rust
+```
+
+- [ ] **Step 4: Verify the crate is picked up by the workspace**
+
+The workspace `Cargo.toml` uses `members = ["lib/crates/*"]` so no changes are needed. Run:
+
+```
+cargo build -p fabro-chat
+```
+
+Expected: compiles (with unused import warnings — fine for now).
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add lib/crates/fabro-chat/
+git commit -m "feat(chat): scaffold fabro-chat crate"
+```
+
+---
+
+### Task 2: Shared types
+
+**Files:**
+- Modify: `lib/crates/fabro-chat/src/types.rs`
+
+- [ ] **Step 1: Write the failing test**
+
+Add to `lib/crates/fabro-chat/src/types.rs`:
+
+```rust
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn chat_provider_kind_display() {
+        assert_eq!(ChatProviderKind::Slack.to_string(), "slack");
+        assert_eq!(ChatProviderKind::Mattermost.to_string(), "mattermost");
+        assert_eq!(ChatProviderKind::Teams.to_string(), "teams");
+    }
+
+    #[test]
+    fn chat_provider_kind_as_str() {
+        assert_eq!(ChatProviderKind::Slack.as_str(), "slack");
+    }
+
+    #[test]
+    fn webhook_outcome_default_body_is_none() {
+        let outcome = WebhookOutcome { status: 200, body: None };
+        assert_eq!(outcome.status, 200);
+        assert!(outcome.body.is_none());
+    }
+
+    #[test]
+    fn answer_submission_round_trips_json() {
+        use fabro_interview::{Answer, AnswerSubmission};
+        use fabro_types::Principal;
+
+        let sub = AnswerSubmission {
+            run_id: "run_01abc".to_string(),
+            qid:    "q1".to_string(),
+            answer: Answer::yes(),
+            actor:  Principal::Slack {
+                user_id:   "U123".to_string(),
+                user_name: Some("alice".to_string()),
+            },
+        };
+        let json = serde_json::to_string(&sub).unwrap();
+        let back: AnswerSubmission = serde_json::from_str(&json).unwrap();
+        assert_eq!(back.run_id, "run_01abc");
+        assert_eq!(back.qid, "q1");
+    }
+}
+```
+
+- [ ] **Step 2: Run tests to confirm they fail**
+
+```
+cargo nextest run -p fabro-chat
+```
+
+Expected: FAIL — types not defined yet.
+
+- [ ] **Step 3: Implement the types**
+
+Replace the body of `lib/crates/fabro-chat/src/types.rs`:
+
+```rust
+use fabro_interview::{Answer, AnswerSubmission as InterviewAnswerSubmission};
+use fabro_types::Principal;
+use serde::{Deserialize, Serialize};
+use strum::{Display, IntoStaticStr};
+
+/// Discriminant for webhook dispatch and logging.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Display, IntoStaticStr)]
+#[strum(serialize_all = "snake_case")]
+pub enum ChatProviderKind {
+    Slack,
+    Mattermost,
+    Teams,
+}
+
+impl ChatProviderKind {
+    pub fn as_str(self) -> &'static str {
+        self.into()
+    }
+}
+
+/// An answer submission from a chat platform, enriched with routing information.
+///
+/// Distinct from `fabro_interview::AnswerSubmission` which lacks `run_id`/`qid`.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AnswerSubmission {
+    pub run_id: String,
+    pub qid:    String,
+    pub answer: Answer,
+    pub actor:  Principal,
+}
+
+impl AnswerSubmission {
+    /// Convert into an `fabro_interview::AnswerSubmission` for passing to the interview layer.
+    pub fn into_interview_submission(self) -> InterviewAnswerSubmission {
+        InterviewAnswerSubmission::new(self.answer, self.actor)
+    }
+}
+
+/// Lightweight HTTP response returned by `ChatService::handle_webhook`.
+///
+/// Keeps provider crates free of axum; `fabro-server` converts this into an Axum response.
+#[derive(Debug, Clone)]
+pub struct WebhookOutcome {
+    pub status: u16,
+    pub body:   Option<String>,
+}
+```
+
+- [ ] **Step 4: Run tests to confirm they pass**
+
+```
+cargo nextest run -p fabro-chat
+```
+
+Expected: PASS.
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add lib/crates/fabro-chat/src/types.rs
+git commit -m "feat(chat): add ChatProviderKind, AnswerSubmission, WebhookOutcome types"
+```
+
+---
+
+### Task 3: `ChatEventContext` trait
+
+**Files:**
+- Modify: `lib/crates/fabro-chat/src/context.rs`
+
+- [ ] **Step 1: Write the failing test**
+
+Add to `lib/crates/fabro-chat/src/context.rs`:
+
+```rust
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::sync::Arc;
+
+    struct AlwaysNoneContext;
+
+    #[async_trait::async_trait]
+    impl ChatEventContext for AlwaysNoneContext {
+        async fn get_run_projection(
+            &self,
+            _run_id: fabro_types::RunId,
+        ) -> Option<Arc<fabro_types::RunProjection>> {
+            None
+        }
+        fn resolve_env(&self, _name: &str) -> Option<String> {
+            None
+        }
+        fn run_web_url(&self, _run_id: &fabro_types::RunId) -> Option<String> {
+            None
+        }
+        fn canonical_origin(&self) -> Option<String> {
+            None
+        }
+    }
+
+    #[tokio::test]
+    async fn context_methods_callable() {
+        let ctx = AlwaysNoneContext;
+        let run_id = fabro_types::RunId::new();
+        assert!(ctx.get_run_projection(run_id.clone()).await.is_none());
+        assert!(ctx.resolve_env("FOO").is_none());
+        assert!(ctx.run_web_url(&run_id).is_none());
+        assert!(ctx.canonical_origin().is_none());
+    }
+}
+```
+
+- [ ] **Step 2: Run tests to confirm they fail**
+
+```
+cargo nextest run -p fabro-chat
+```
+
+Expected: FAIL — `ChatEventContext` not defined.
+
+- [ ] **Step 3: Implement `ChatEventContext`**
+
+Replace the body of `lib/crates/fabro-chat/src/context.rs`:
+
+```rust
+use std::sync::Arc;
+
+use async_trait::async_trait;
+use fabro_types::{RunId, RunProjection};
+
+#[async_trait]
+pub trait ChatEventContext: Send + Sync {
+    /// Fetch the current projection for a run (used to build notification content).
+    async fn get_run_projection(&self, run_id: RunId) -> Option<Arc<RunProjection>>;
+
+    /// Look up a named environment variable (used to resolve per-run config).
+    fn resolve_env(&self, name: &str) -> Option<String>;
+
+    /// Build a web UI deep link for a run, e.g. `https://app.example.com/runs/01abc`.
+    fn run_web_url(&self, run_id: &RunId) -> Option<String>;
+
+    /// The canonical server origin, e.g. `https://fabro.example.com`.
+    /// Used by Mattermost to build button `integration.url` values.
+    fn canonical_origin(&self) -> Option<String>;
+}
+```
+
+- [ ] **Step 4: Run tests to confirm they pass**
+
+```
+cargo nextest run -p fabro-chat
+```
+
+Expected: PASS.
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add lib/crates/fabro-chat/src/context.rs
+git commit -m "feat(chat): add ChatEventContext trait"
+```
+
+---
+
+### Task 4: `ChatService` trait
+
+**Files:**
+- Modify: `lib/crates/fabro-chat/src/service.rs`
+
+- [ ] **Step 1: Write the failing test**
+
+Add to `lib/crates/fabro-chat/src/service.rs`:
+
+```rust
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::sync::Arc;
+    use bytes::Bytes;
+    use fabro_types::{
+        IntegrationConnectionKind, IntegrationConnectionState, IntegrationConnectionStatus,
+    };
+    use crate::context::ChatEventContext;
+    use crate::types::{AnswerSubmission, ChatProviderKind, WebhookOutcome};
+
+    struct SlackStub;
+
+    #[async_trait::async_trait]
+    impl ChatService for SlackStub {
+        fn kind(&self) -> ChatProviderKind {
+            ChatProviderKind::Slack
+        }
+        async fn start(&self, _on_submit: Arc<dyn Fn(AnswerSubmission) + Send + Sync>) {}
+        async fn handle_event(
+            &self,
+            _envelope: &fabro_types::EventEnvelope,
+            _context: &dyn ChatEventContext,
+        ) {
+        }
+        async fn handle_webhook(
+            &self,
+            _sub_path: &str,
+            _query_string: &str,
+            _headers: &http::HeaderMap,
+            _body: &Bytes,
+        ) -> WebhookOutcome {
+            WebhookOutcome { status: 404, body: None }
+        }
+        fn connection_status(&self) -> IntegrationConnectionStatus {
+            IntegrationConnectionStatus {
+                kind:              IntegrationConnectionKind::SocketMode,
+                status:            IntegrationConnectionState::Connected,
+                last_connected_at: None,
+                last_error:        None,
+            }
+        }
+    }
+
+    #[tokio::test]
+    async fn trait_is_object_safe() {
+        let svc: Arc<dyn ChatService> = Arc::new(SlackStub);
+        assert_eq!(svc.kind(), ChatProviderKind::Slack);
+    }
+}
+```
+
+- [ ] **Step 2: Run tests to confirm they fail**
+
+```
+cargo nextest run -p fabro-chat
+```
+
+Expected: FAIL — `ChatService` not defined, `http` crate not available.
+
+- [ ] **Step 3: Add `http` to `Cargo.toml`**
+
+The `http` crate ships as part of axum's public API surface but is also a standalone crate. Add it to `lib/crates/fabro-chat/Cargo.toml` directly so provider crates don't need axum:
+
+```toml
+[dependencies]
+# existing entries ...
+http = "1"
+```
+
+Check the version axum uses:
+
+```
+cargo tree -p axum --depth 1 | grep "^http"
+```
+
+Use whatever version is listed (axum 0.8 uses `http` 1.x).
+
+- [ ] **Step 4: Implement `ChatService`**
+
+Replace the body of `lib/crates/fabro-chat/src/service.rs`:
+
+```rust
+use std::sync::Arc;
+
+use async_trait::async_trait;
+use bytes::Bytes;
+use fabro_types::{EventEnvelope, IntegrationConnectionStatus};
+use http::HeaderMap;
+
+use crate::context::ChatEventContext;
+use crate::types::{AnswerSubmission, ChatProviderKind, WebhookOutcome};
+
+#[async_trait]
+pub trait ChatService: Send + Sync {
+    fn kind(&self) -> ChatProviderKind;
+
+    /// Start the provider's inbound event loop.
+    /// - Slack: spawns Socket Mode WebSocket loop.
+    /// - Mattermost: spawns WebSocket loop.
+    /// - Teams: documented no-op — delivers events via inbound HTTP only.
+    async fn start(&self, on_submit: Arc<dyn Fn(AnswerSubmission) + Send + Sync>);
+
+    /// Handle an outbound Fabro event (send notifications, post interview questions).
+    async fn handle_event(&self, envelope: &EventEnvelope, context: &dyn ChatEventContext);
+
+    /// Handle an inbound HTTP webhook (button actions, Teams activities).
+    /// `query_string` is the raw URI query, e.g. `"token=abc&foo=bar"`.
+    /// Slack always returns 404 — it has no inbound HTTP surface.
+    async fn handle_webhook(
+        &self,
+        sub_path: &str,
+        query_string: &str,
+        headers: &HeaderMap,
+        body: &Bytes,
+    ) -> WebhookOutcome;
+
+    fn connection_status(&self) -> IntegrationConnectionStatus;
+}
+```
+
+- [ ] **Step 5: Run tests to confirm they pass**
+
+```
+cargo nextest run -p fabro-chat
+```
+
+Expected: PASS.
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add lib/crates/fabro-chat/src/service.rs lib/crates/fabro-chat/Cargo.toml
+git commit -m "feat(chat): add ChatService trait"
+```
+
+---
+
+### Task 5: Test-support helpers
+
+**Files:**
+- Modify: `lib/crates/fabro-chat/src/test_support.rs`
+
+These helpers are gated behind `#[cfg(any(test, feature = "test-support"))]` and are used by `fabro-slack`, `fabro-mattermost`, and `fabro-teams` in their unit tests.
+
+- [ ] **Step 1: Write the failing test**
+
+Add a test to `lib/crates/fabro-chat/src/test_support.rs` that imports and exercises the helpers:
+
+```rust
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::sync::Arc;
+    use bytes::Bytes;
+    use fabro_types::{
+        IntegrationConnectionKind, IntegrationConnectionState, IntegrationConnectionStatus,
+        RunId,
+    };
+    use crate::context::ChatEventContext;
+    use crate::service::ChatService;
+    use crate::types::{AnswerSubmission, ChatProviderKind, WebhookOutcome};
+
+    struct TeamsStub;
+
+    #[async_trait::async_trait]
+    impl ChatService for TeamsStub {
+        fn kind(&self) -> ChatProviderKind { ChatProviderKind::Teams }
+        async fn start(&self, _on_submit: Arc<dyn Fn(AnswerSubmission) + Send + Sync>) {}
+        async fn handle_event(
+            &self,
+            _envelope: &fabro_types::EventEnvelope,
+            _context: &dyn ChatEventContext,
+        ) {}
+        async fn handle_webhook(
+            &self,
+            _sub_path: &str,
+            _query_string: &str,
+            _headers: &http::HeaderMap,
+            _body: &Bytes,
+        ) -> WebhookOutcome {
+            WebhookOutcome { status: 200, body: None }
+        }
+        fn connection_status(&self) -> IntegrationConnectionStatus {
+            IntegrationConnectionStatus {
+                kind:              IntegrationConnectionKind::SocketMode,
+                status:            IntegrationConnectionState::Connected,
+                last_connected_at: None,
+                last_error:        None,
+            }
+        }
+    }
+
+    #[tokio::test]
+    async fn mock_context_get_run_projection_returns_none_by_default() {
+        let ctx = MockChatEventContext::default();
+        assert!(ctx.get_run_projection(RunId::new()).await.is_none());
+    }
+
+    #[test]
+    fn mock_context_resolve_env_returns_configured_value() {
+        let ctx = MockChatEventContext::default()
+            .with_env("FABRO_URL", "https://app.example.com");
+        assert_eq!(ctx.resolve_env("FABRO_URL").as_deref(), Some("https://app.example.com"));
+        assert!(ctx.resolve_env("OTHER").is_none());
+    }
+
+    #[test]
+    fn mock_context_canonical_origin() {
+        let ctx = MockChatEventContext::default()
+            .with_canonical_origin("https://fabro.example.com");
+        assert_eq!(ctx.canonical_origin().as_deref(), Some("https://fabro.example.com"));
+    }
+
+    #[tokio::test]
+    async fn contract_checker_passes_for_teams_stub() {
+        let svc = TeamsStub;
+        assert_chat_service_contract(&svc).await;
+    }
+}
+```
+
+- [ ] **Step 2: Run tests to confirm they fail**
+
+```
+cargo nextest run -p fabro-chat
+```
+
+Expected: FAIL — `MockChatEventContext` and `assert_chat_service_contract` not defined.
+
+- [ ] **Step 3: Implement the test-support helpers**
+
+Write `lib/crates/fabro-chat/src/test_support.rs`:
+
+```rust
+use std::collections::HashMap;
+use std::sync::Arc;
+
+use async_trait::async_trait;
+use bytes::Bytes;
+use fabro_types::{RunId, RunProjection};
+use http::HeaderMap;
+
+use crate::context::ChatEventContext;
+use crate::service::ChatService;
+
+/// A configurable `ChatEventContext` for use in provider unit tests.
+#[derive(Default)]
+pub struct MockChatEventContext {
+    env:              HashMap<String, String>,
+    canonical_origin: Option<String>,
+    run_web_url:      Option<String>,
+}
+
+impl MockChatEventContext {
+    pub fn with_env(mut self, name: impl Into<String>, value: impl Into<String>) -> Self {
+        self.env.insert(name.into(), value.into());
+        self
+    }
+
+    pub fn with_canonical_origin(mut self, origin: impl Into<String>) -> Self {
+        self.canonical_origin = Some(origin.into());
+        self
+    }
+
+    pub fn with_run_web_url(mut self, url: impl Into<String>) -> Self {
+        self.run_web_url = Some(url.into());
+        self
+    }
+}
+
+#[async_trait]
+impl ChatEventContext for MockChatEventContext {
+    async fn get_run_projection(&self, _run_id: RunId) -> Option<Arc<RunProjection>> {
+        None
+    }
+
+    fn resolve_env(&self, name: &str) -> Option<String> {
+        self.env.get(name).cloned()
+    }
+
+    fn run_web_url(&self, _run_id: &RunId) -> Option<String> {
+        self.run_web_url.clone()
+    }
+
+    fn canonical_origin(&self) -> Option<String> {
+        self.canonical_origin.clone()
+    }
+}
+
+/// Thin conformance checker: verifies a `ChatService` implementation satisfies
+/// the basic contract without panicking or returning obviously invalid values.
+pub async fn assert_chat_service_contract(service: &dyn ChatService) {
+    // kind() returns a valid variant (doesn't panic)
+    let _ = service.kind();
+
+    // connection_status() doesn't panic
+    let _ = service.connection_status();
+
+    // handle_webhook with empty inputs returns a plausible HTTP status
+    let outcome = service
+        .handle_webhook("", "", &HeaderMap::new(), &Bytes::new())
+        .await;
+    assert!(
+        outcome.status >= 200 && outcome.status < 600,
+        "handle_webhook returned invalid HTTP status {}",
+        outcome.status
+    );
+}
+```
+
+- [ ] **Step 4: Run tests to confirm they pass**
+
+```
+cargo nextest run -p fabro-chat
+```
+
+Expected: PASS.
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add lib/crates/fabro-chat/src/test_support.rs
+git commit -m "feat(chat): add MockChatEventContext and assert_chat_service_contract"
+```
+
+---
+
+### Task 6: Full workspace build check
+
+- [ ] **Step 1: Build the full workspace without test-support**
+
+```
+cargo build --workspace
+```
+
+Expected: PASS. `fabro-chat` compiles; no other crates affected yet.
+
+- [ ] **Step 2: Run the full workspace test suite**
+
+```
+cargo nextest run --workspace
+```
+
+Expected: PASS. New `fabro-chat` tests pass; no existing tests broken.
+
+- [ ] **Step 3: Check formatting**
+
+```
+cargo +nightly-2026-04-14 fmt --check --all
+```
+
+If formatting issues are reported, fix them:
+
+```
+cargo +nightly-2026-04-14 fmt --all
+git add -u
+git commit -m "style: fmt fabro-chat"
+```
+
+- [ ] **Step 4: Run clippy**
+
+```
+cargo +nightly-2026-04-14 clippy --workspace --all-targets -- -D warnings
+```
+
+Expected: PASS. Fix any warnings before proceeding.
+
+- [ ] **Step 5: Final commit (if needed after fmt/clippy)**
+
+```bash
+git add -u
+git commit -m "fix(chat): address clippy warnings in fabro-chat"
+```