diff --git a/apps/claude-code/unic-pr-review/.claude-plugin/marketplace.json b/apps/claude-code/unic-pr-review/.claude-plugin/marketplace.json
index a664ff0a..6f2739b1 100644
--- a/apps/claude-code/unic-pr-review/.claude-plugin/marketplace.json
+++ b/apps/claude-code/unic-pr-review/.claude-plugin/marketplace.json
@@ -21,7 +21,7 @@
       "name": "unic-pr-review",
       "source": "./",
       "tags": ["productivity", "code-review", "azure-devops"],
-      "version": "2.1.2"
+      "version": "2.1.3"
     }
   ]
 }
diff --git a/apps/claude-code/unic-pr-review/.claude-plugin/plugin.json b/apps/claude-code/unic-pr-review/.claude-plugin/plugin.json
index 27a9363a..6a2223f6 100644
--- a/apps/claude-code/unic-pr-review/.claude-plugin/plugin.json
+++ b/apps/claude-code/unic-pr-review/.claude-plugin/plugin.json
@@ -15,5 +15,5 @@
   "keywords": ["pr-review", "azure-devops", "jira", "confluence", "code-review", "unic"],
   "license": "LGPL-3.0-or-later",
   "name": "unic-pr-review",
-  "version": "2.1.2"
+  "version": "2.1.3"
 }
diff --git a/apps/claude-code/unic-pr-review/CHANGELOG.md b/apps/claude-code/unic-pr-review/CHANGELOG.md
index fc9eb241..1f23a74f 100644
--- a/apps/claude-code/unic-pr-review/CHANGELOG.md
+++ b/apps/claude-code/unic-pr-review/CHANGELOG.md
@@ -16,6 +16,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 - (none)
 
+## [2.1.3] — 2026-06-05
+
+### Breaking
+- (none)
+
+### Added
+- `silent-failure-hunter` agent now detects lost-signal / observability gaps: fallback branches, early-return guards, and cancellation handlers that exit without emitting the analytics event, telemetry call, structured log, or Sentry capture that the normal execution path emits (issue #217)
+- `silent-failure-hunter` agent recognises missing event-emission APIs (`trackEvent`, `analytics.page`, `reportError`, APM spans, Sentry breadcrumbs) on non-success paths (issue #217)
+- `silent-failure-hunter` agent flags logging or diagnostic calls unconditionally gated on a development / debug flag, making them invisible in production (issue #217)
+- False-positive guards: symmetric exclusions prevent over-flagging intentional conditional telemetry, different-event traces on error paths, and telemetry disabled by design (issue #217)
+
+### Fixed
+- (none)
+
 ## [2.1.2] — 2026-06-04
 
 ### Breaking
diff --git a/apps/claude-code/unic-pr-review/agents/silent-failure-hunter.md b/apps/claude-code/unic-pr-review/agents/silent-failure-hunter.md
index c9801b8f..69e3a7ec 100644
--- a/apps/claude-code/unic-pr-review/agents/silent-failure-hunter.md
+++ b/apps/claude-code/unic-pr-review/agents/silent-failure-hunter.md
@@ -39,12 +39,17 @@ Apply the rubric strictly. If you are unsure whether a Finding reaches 60, it do
 - Fallback chains (try A, then B, then C) that switch approaches without recording or explaining why the prior attempt failed
 - Retry logic that exhausts all attempts and then proceeds or returns a default without surfacing the final failure to the caller or the logs
 - Errors caught locally that should propagate to a higher-level handler — catching here prevents proper cleanup, resource release, or centralised handling
+- Lost-signal / observability gaps: a fallback branch, early-return guard, or cancellation handler exits without emitting the analytics event, telemetry call, structured log, or Sentry capture that the normal execution path emits — leaving the outcome invisible in production observability tools
+- Event emission (`trackEvent`, `analytics.page`, `reportError`, APM spans, Sentry breadcrumbs) that appears only on the success/normal path; an early-exit guard or exception branch skips it without firing a corresponding trace to record what actually happened
+- Logging or diagnostic calls unconditionally gated on a development flag (`process.env.NODE_ENV !== 'production'`, `__DEV__`, `IS_TEST`) with no production-observable fallback — production gets silence where developers see output
 
 ## What NOT to look for
 
 - Formatting or whitespace (handled by Biome)
 - Error-handling that is deliberately suppressive and clearly documented as such (e.g. fire-and-forget telemetry)
 - Handling patterns outside the diff scope
+- A fallback or early-return that deliberately fires a **different** matching event to record the outcome (e.g. a `navigation_cancelled` event in place of `page_view`) — the outcome is still traced under a different name; this is deliberate traced suppression, not a gap
+- Analytics / telemetry emission that is intentionally disabled in specific environments when the omission is explicit and documented (e.g. a guarding comment, a feature flag, or a dedicated `isAnalyticsEnabled()` / `isTelemetryEnabled()` wrapper)
 
 ## Output format
 
diff --git a/apps/claude-code/unic-pr-review/package.json b/apps/claude-code/unic-pr-review/package.json
index 9286f360..9eb8dc93 100644
--- a/apps/claude-code/unic-pr-review/package.json
+++ b/apps/claude-code/unic-pr-review/package.json
@@ -22,5 +22,5 @@
     "verify:changelog": "unic-verify-changelog"
   },
   "type": "module",
-  "version": "2.1.2"
+  "version": "2.1.3"
 }