fix: harden session routing and nested worktrees

Cargo.toml

@@ -9,6 +9,7 @@ homepage = "https://github.com/ScriptedAlchemy/tracedecay"
 readme = "README.md"
 keywords = ["code-intelligence", "knowledge-graph", "mcp", "tree-sitter", "claude"]
 categories = ["development-tools", "command-line-utilities"]
+
 # Explicit whitelist so `cargo package`/`cargo publish` ship everything the
 # build needs — including the PREBUILT dashboard dist bundles, which are
 # gitignored (an `exclude`-style package can never pick them up). Run
@@ -40,6 +41,9 @@ include = [
     "/dashboard/hermes-wrapper/src/**",
 ]
 
+[workspace]
+exclude = [".worktrees", ".codex-worktrees"]
+
 [features]
 default = ["full", "token-counting"]
 

src/git.rs

@@ -171,6 +171,9 @@ pub(crate) fn git_capture_at(repo_root: &Path, args: &[&str]) -> GitCaptureAtRes
 
 fn git_command_at(repo_root: &Path, args: &[&str]) -> Command {
     let mut command = Command::new(git_program());
+    command.env_remove("GIT_DIR");
+    command.env_remove("GIT_WORK_TREE");
+    command.env_remove("GIT_COMMON_DIR");
     command.arg("-C").arg(repo_root).args(args);
     command
 }
@@ -266,6 +269,22 @@ mod tests {
         );
     }
 
+    #[test]
+    fn git_at_command_clears_repository_selection_overrides() {
+        let command = git_command_at(Path::new("/problematic/project/root"), &["status"]);
+
+        for key in ["GIT_DIR", "GIT_WORK_TREE", "GIT_COMMON_DIR"] {
+            assert_eq!(
+                command
+                    .get_envs()
+                    .find(|(candidate, _)| *candidate == OsStr::new(key))
+                    .map(|(_, value)| value),
+                Some(None),
+                "git -C must resolve the supplied root rather than inherited {key}"
+            );
+        }
+    }
+
     #[cfg(unix)]
     #[test]
     fn git_capture_deadline_kills_and_reaps_child() {

src/sessions/claude.rs

@@ -1379,7 +1379,7 @@ mod tests {
             .ancestors()
             .find(|ancestor| ancestor.file_name().is_some_and(|name| name == "repo"))
             .unwrap_or(path);
-        if UNKNOWN_PATH_ATTEMPTS.fetch_add(1, Ordering::SeqCst) == 0 {
+        if UNKNOWN_PATH_ATTEMPTS.fetch_add(1, Ordering::SeqCst) == 1 {
             return crate::worktree::GitRepoIdentityOutcome::Unknown;
         }
         crate::worktree::GitRepoIdentityOutcome::Resolved(crate::worktree::GitRepoIdentity {

src/sessions/cline_like.rs

@@ -22,9 +22,9 @@ use serde_json::{Map, Value};
 
 use crate::sessions::SessionMessageRecord;
 use crate::sessions::shared::{
-    StoredCursor, TranscriptLocation, TranscriptLocationMetadataKeys, append_location_metadata,
-    append_tool_calls_metadata, append_usage_metadata, content_storage_text_and_tools,
-    path_belongs_to_project, title_from_messages,
+    ProjectMembership, ProjectRootMatcherCache, StoredCursor, TranscriptLocation,
+    TranscriptLocationMetadataKeys, append_location_metadata, append_tool_calls_metadata,
+    append_usage_metadata, content_storage_text_and_tools, title_from_messages,
 };
 use crate::sessions::source::{
     ParsedTranscript, SessionDraft, TranscriptSource, read_changed_with_companion,
@@ -46,6 +46,7 @@ pub struct ClineLikeSource {
     provider: &'static str,
     storage_roots: Vec<PathBuf>,
     user_registered_roots: Option<Vec<PathBuf>>,
+    project_matchers: ProjectRootMatcherCache,
 }
 
 impl ClineLikeSource {
@@ -78,6 +79,7 @@ impl ClineLikeSource {
                     .join("User/globalStorage/saoudrizwan.claude-dev/tasks"),
             ],
             user_registered_roots: None,
+            project_matchers: ProjectRootMatcherCache::default(),
         }
     }
 
@@ -89,6 +91,7 @@ impl ClineLikeSource {
                     .join("User/globalStorage/rooveterinaryinc.roo-cline/tasks"),
             ],
             user_registered_roots: None,
+            project_matchers: ProjectRootMatcherCache::default(),
         }
     }
 
@@ -101,6 +104,7 @@ impl ClineLikeSource {
                 home.join(".kilocode/cli/global/tasks"),
             ],
             user_registered_roots: None,
+            project_matchers: ProjectRootMatcherCache::default(),
         }
     }
 
@@ -137,15 +141,15 @@ impl TranscriptSource for ClineLikeSource {
         let metadata = read_task_metadata(task_dir)?;
         let location_cwd = if let Some(roots) = &self.user_registered_roots {
             let paths = metadata_project_paths(&metadata);
-            if paths
-                .iter()
-                .any(|path| roots.iter().any(|root| path_belongs_to_project(path, root)))
-            {
+            if paths.iter().any(|path| {
+                self.project_matchers.membership_against_roots(path, roots)
+                    != ProjectMembership::NoMatch
+            }) {
                 return None;
             }
             paths.into_iter().next()?
         } else {
-            metadata_project_location(&metadata, project_root)?
+            metadata_project_location(&metadata, project_root, &self.project_matchers)?
         };
 
         let document: Value = match serde_json::from_str(&changed.contents) {
@@ -310,10 +314,24 @@ fn read_task_metadata(task_dir: &Path) -> Option<Value> {
     None
 }
 
-fn metadata_project_location(metadata: &Value, project_root: &Path) -> Option<PathBuf> {
-    metadata_project_paths(metadata)
-        .into_iter()
-        .find(|path| path_belongs_to_project(path, project_root))
+fn metadata_project_location(
+    metadata: &Value,
+    project_root: &Path,
+    project_matchers: &ProjectRootMatcherCache,
+) -> Option<PathBuf> {
+    let mut matched = None;
+    for path in metadata_project_paths(metadata) {
+        match project_matchers.membership(&path, project_root) {
+            ProjectMembership::Match => {
+                if matched.is_none() {
+                    matched = Some(path);
+                }
+            }
+            ProjectMembership::NoMatch => {}
+            ProjectMembership::Unknown => return None,
+        }
+    }
+    matched
 }
 
 fn metadata_project_paths(value: &Value) -> Vec<PathBuf> {

src/sessions/codex.rs

@@ -1623,7 +1623,7 @@ mod source_matcher_cache_tests {
             .ancestors()
             .find(|ancestor| ancestor.file_name().is_some_and(|name| name == "repo"))
             .unwrap_or(path);
-        if UNKNOWN_PATH_ATTEMPTS.fetch_add(1, Ordering::SeqCst) == 0 {
+        if UNKNOWN_PATH_ATTEMPTS.fetch_add(1, Ordering::SeqCst) == 1 {
             return crate::worktree::GitRepoIdentityOutcome::Unknown;
         }
         crate::worktree::GitRepoIdentityOutcome::Resolved(crate::worktree::GitRepoIdentity {

src/sessions/cursor_composer.rs

@@ -45,7 +45,7 @@ use libsql::{Builder, OpenFlags};
 use serde_json::{Value, json};
 
 use crate::global_db::{GlobalDb, ParseOffset};
-use crate::sessions::shared::path_belongs_to_project;
+use crate::sessions::shared::{ProjectMembership, ProjectRootMatcherCache};
 use crate::sessions::{SessionMessageRecord, SessionRecord};
 
 /// `SQLITE_OPEN_URI` — not exposed by libsql's [`OpenFlags`], so we OR the raw
@@ -84,6 +84,7 @@ impl CursorComposerSweepOutcome {
 pub struct CursorComposerSource {
     state_db_path: PathBuf,
     chats_dir: PathBuf,
+    project_matchers: ProjectRootMatcherCache,
 }
 
 impl CursorComposerSource {
@@ -104,6 +105,7 @@ impl CursorComposerSource {
                 .join("globalStorage")
                 .join("state.vscdb"),
             chats_dir: home.join(".cursor").join("chats"),
+            project_matchers: ProjectRootMatcherCache::default(),
         }
     }
 
@@ -209,20 +211,23 @@ impl CursorComposerSource {
                     .or_insert_with(|| project.path.clone());
             }
             let selected_project = match project_root {
-                Some(root) if path_belongs_to_project(Path::new(&project.path), root) => {
-                    ComposerProject {
+                Some(root) => match self
+                    .project_matchers
+                    .membership(Path::new(&project.path), root)
+                {
+                    ProjectMembership::Match => ComposerProject {
                         path: project.path.clone(),
-                    }
-                }
-                Some(_) => continue,
-                None if registered_roots
-                    .iter()
-                    .any(|root| path_belongs_to_project(Path::new(&project.path), root)) =>
+                    },
+                    ProjectMembership::NoMatch | ProjectMembership::Unknown => continue,
+                },
+                None => match self
+                    .project_matchers
+                    .membership_against_roots(Path::new(&project.path), registered_roots)
                 {
-                    continue;
-                }
-                None => ComposerProject {
-                    path: "user".to_string(),
+                    ProjectMembership::NoMatch => ComposerProject {
+                        path: "user".to_string(),
+                    },
+                    ProjectMembership::Match | ProjectMembership::Unknown => continue,
                 },
             };
             // Own this session for JSONL dedupe regardless of the per-pass cap.
@@ -322,18 +327,20 @@ impl CursorComposerSource {
             let ws_hash = ws_entry.file_name().to_string_lossy().to_string();
             // Scope by ws-hash -> project mapping harvested from the envelopes.
             let project_path = match (workspace_paths.get(&ws_hash), project_root) {
-                (Some(path), Some(root)) if path_belongs_to_project(Path::new(path), root) => {
-                    path.clone()
+                (Some(path), Some(root)) => {
+                    match self.project_matchers.membership(Path::new(path), root) {
+                        ProjectMembership::Match => path.clone(),
+                        ProjectMembership::NoMatch | ProjectMembership::Unknown => continue,
+                    }
                 }
-                (Some(_), Some(_)) | (None, _) => continue,
-                (Some(path), None)
-                    if registered_roots
-                        .iter()
-                        .any(|root| path_belongs_to_project(Path::new(path), root)) =>
+                (None, _) => continue,
+                (Some(path), None) => match self
+                    .project_matchers
+                    .membership_against_roots(Path::new(path), registered_roots)
                 {
-                    continue;
-                }
-                (Some(_), None) => "user".to_string(),
+                    ProjectMembership::NoMatch => "user".to_string(),
+                    ProjectMembership::Match | ProjectMembership::Unknown => continue,
+                },
             };
             let Ok(agent_entries) = std::fs::read_dir(ws_entry.path()) else {
                 continue;