feat: implement workflow findings sharing for inter-agent communication in workflows

src/tool/mod.rs

@@ -38,7 +38,7 @@ pub struct GraduatedCheck {
 }
 
 /// Shared execution context passed to every `Tool::run` call: workspace roots, session
-/// paths, and cached directory state.
+/// paths, cached directory state, and workflow-level findings sharing.
 #[derive(Clone)]
 pub struct ToolCtx {
     pub workspaces: Vec<PathBuf>,
@@ -51,6 +51,12 @@ pub struct ToolCtx {
     pub graduated_checks: Vec<GraduatedCheck>,
     pub lsp_manager: Arc<Mutex<crate::app::lsp::LspManager>>,
     pub turn_events: Option<Arc<Mutex<std::collections::VecDeque<crate::app::state::runtime::TurnEvent>>>>,
+    /// Ephemeral findings shared between sibling subagents in a workflow run.
+    /// Set by the workflow engine before spawning subagents; tools like
+    /// `note_finding` write into this vec so later pipeline stages can
+    /// reference earlier results. `None` means "not inside a workflow" —
+    /// `note_finding` becomes a no-op.
+    pub workflow_findings: Option<Arc<Mutex<Vec<String>>>>,
 }
 
 /// Find which graduated checks apply to a given file path/content pair.
@@ -88,6 +94,7 @@ pub struct ToolCtxBuilder {
     pub graduated_checks: Vec<GraduatedCheck>,
     pub lsp_manager: Arc<Mutex<crate::app::lsp::LspManager>>,
     pub turn_events: Option<Arc<Mutex<std::collections::VecDeque<crate::app::state::runtime::TurnEvent>>>>,
+    pub workflow_findings: Option<Arc<Mutex<Vec<String>>>>,
 }
 
 impl Default for ToolCtxBuilder {
@@ -103,6 +110,7 @@ impl Default for ToolCtxBuilder {
             graduated_checks: Vec::new(),
             lsp_manager: Arc::new(Mutex::new(crate::app::lsp::LspManager::new())),
             turn_events: None,
+            workflow_findings: None,
         }
     }
 }
@@ -117,6 +125,9 @@ impl ToolCtxBuilder {
     /// Set the lsp_manager.
     #[allow(dead_code)]
     pub fn lsp_manager(mut self, v: Arc<Mutex<crate::app::lsp::LspManager>>) -> Self { self.lsp_manager = v; self }
+    /// Set the workflow-level findings sharing Arc (for subagent-to-subagent
+    /// communication within a workflow run).
+    pub fn workflow_findings(mut self, v: Option<Arc<Mutex<Vec<String>>>>) -> Self { self.workflow_findings = v; self }
     /// Consume the builder and produce the final `ToolCtx`.
     pub fn build(self) -> ToolCtx {
         ToolCtx {
@@ -130,6 +141,7 @@ impl ToolCtxBuilder {
             graduated_checks: self.graduated_checks,
             lsp_manager: self.lsp_manager,
             turn_events: self.turn_events,
+            workflow_findings: self.workflow_findings,
         }
     }
 }