diff --git a/crates/colibri-daemon/src/daemon.rs b/crates/colibri-daemon/src/daemon.rs
index 1ecb1f4..839fedf 100644
--- a/crates/colibri-daemon/src/daemon.rs
+++ b/crates/colibri-daemon/src/daemon.rs
@@ -268,7 +268,17 @@ pub async fn heartbeat(state: &SharedState, _stall_timeout: Duration) {
                             cost: u.cost(),
                             success: status.success(),
                         };
-                        let store = state.store.lock().unwrap();
+                        let store = match state.store.try_lock() {
+                            Ok(s) => s,
+                            Err(std::sync::TryLockError::WouldBlock) => {
+                                warn!(task_id = %task_id, "store lock busy; cost capture deferred to next heartbeat");
+                                continue;
+                            }
+                            Err(std::sync::TryLockError::Poisoned(e)) => {
+                                warn!(task_id = %task_id, "store lock poisoned (prior panic); recovering inner store");
+                                e.into_inner()
+                            }
+                        };
                         match store.set_task_cost(task_id, &tc) {
                             Ok(t) => info!(
                                 task_id = %task_id,
diff --git a/crates/colibri-mcp/src/lib.rs b/crates/colibri-mcp/src/lib.rs
index 5e6391a..0225b1c 100644
--- a/crates/colibri-mcp/src/lib.rs
+++ b/crates/colibri-mcp/src/lib.rs
@@ -146,8 +146,8 @@ pub fn tool_list() -> Vec<Value> {
             })),
         ),
         json_tool(
-            "colibri_get_task_cost",
-            "Get per-task cost summary: tokens used, cache hit ratio, cost, success status",
+            "colibri_get_task",
+            "Get task details including per-task cost: tokens used, cache hit ratio, cost_usd, success status",
             Some(serde_json::json!({
                 "type": "object",
                 "properties": {
@@ -289,7 +289,7 @@ pub async fn dispatch_tool(
                 "note": "Cost mode change is runtime-only/status-intent until live config mutation exists."
             })))
         }
-        "colibri_get_task_cost" => {
+        "colibri_get_task" => {
             let task_id = require_string(arguments, "task_id")?;
             let all_tasks = client.list_tasks(None).await.map_err(map_client_error)?;
             let task = all_tasks
diff --git a/crates/colibri-mcp/tests/tool_dispatch.rs b/crates/colibri-mcp/tests/tool_dispatch.rs
index 54d5dfa..f5119a4 100644
--- a/crates/colibri-mcp/tests/tool_dispatch.rs
+++ b/crates/colibri-mcp/tests/tool_dispatch.rs
@@ -252,6 +252,6 @@ fn tool_list_has_all_phase1_tools() {
     assert!(names.contains(&"colibri_external_mcp_servers"));
     assert!(names.contains(&"colibri_external_mcp_list_tools"));
     assert!(names.contains(&"colibri_external_mcp_call_tool"));
-    assert!(names.contains(&"colibri_get_task_cost"));
+    assert!(names.contains(&"colibri_get_task"));
     assert_eq!(names.len(), 11);
 }
diff --git a/docs/wiki/contracts.md b/docs/wiki/contracts.md
index 19bfd95..6e44226 100644
--- a/docs/wiki/contracts.md
+++ b/docs/wiki/contracts.md
@@ -19,7 +19,8 @@ between Colibri (Rust) and Clawdie agents (TypeScript). It owns _schemas and
 | -------------------------------------- | --------------------- | -------------------------------------------------------------- |
 | `clawdie.interagent.run-manifest.v1`   | `RunManifest`         | Records a build/test run — role, agent, artifacts, summary.    |
 | `clawdie.runtime-version-inventory.v1` | `RuntimeInventory`    | Host runtime snapshot — OS, package versions, npm/node/zot/pi. |
-| `clawdie.provider-test.result.v1`     | `ProviderSmokeResult` | DeepSeek cache-hit probe result and token accounting.          |
+| `clawdie.provider-test.result.v1`      | `ProviderSmokeResult` | DeepSeek cache-hit probe result and token accounting.          |
+| `clawdie.task-cost-summary.v1`         | `TaskCostSummary`     | Per-task cost breakdown — input/output/cache tokens, cost_usd. |
 
 Schema constants and structs live in `crates/colibri-contracts/src/lib.rs`.