diff --git a/docs/interpreter-generators.md b/docs/interpreter-generators.md
index 9a3f1a4..9823d36 100644
--- a/docs/interpreter-generators.md
+++ b/docs/interpreter-generators.md
@@ -37,8 +37,8 @@ See the [yield expression and generator method reference](https://docs.python.or
 
 ## Acceptance
 
-The corpus contains 28 adopted class comparisons and three explicit refusals;
-the shared core selection has 25 comparisons and three refusals. CI runs all
+The corpus contains 33 adopted class comparisons and three explicit refusals;
+the shared core selection has 30 comparisons and three refusals. CI runs all
 eight target/profile/driver combinations and requires zero logical teardown.
 Dedicated tests collect between every instruction, retain suspended aliases and
 cycles, and interrupt execution in generator bodies and comprehension callbacks.
@@ -49,3 +49,7 @@ Run `python -m examples.interpreter_generators` to build a composed console;
 new source after reload, method/body errors, hard Stop/Restart and waiting
 class-to-core updates. Assignment expressions in comprehensions, multi-argument
 throw, generator frame introspection and async retain their future boundaries.
+
+Injected generator exceptions retain the fresh definition or suspended yield
+frame, delegated yield-from frames and active exception context. The corpus
+checks these frame names and source lines against the pinned executable oracle.
diff --git a/runtime/check_classes.py b/runtime/check_classes.py
index 0a5b94f..ceb8f0d 100644
--- a/runtime/check_classes.py
+++ b/runtime/check_classes.py
@@ -43,6 +43,10 @@ def references(corpus_path=CORPUS):
         passed = passed and actual['stdout'] == case.get('stdout', '')
         if 'error_type' in case:
             passed = passed and actual.get('error', {}).get('type') == case['error_type']
+        if 'error_frames' in case:
+            passed = passed and actual.get('error', {}).get('frames') == case['error_frames']
+        if 'error_context_type' in case:
+            passed = passed and (actual.get('error', {}).get('context') or {}).get('type') == case['error_context_type']
         records.append({'id': case['id'], 'stage': case['stage'],
                         'reference_status': 'pass' if passed else 'fail', 'reference': actual})
     return {'schema_version': 1, 'suite': corpus.get('suite', 'interpreter-classes/1'), 'profile': corpus['profile'],
@@ -89,6 +93,12 @@ def check(target, channel=None, corpus_path=CORPUS, stages=None, stepped=False,
             passed = actual['ok'] == expected['ok'] and actual['stdout'] == expected['stdout']
             if not expected['ok']:
                 passed = passed and actual.get('error', {}).get('type') == expected['error']['type']
+            if 'error_frames' in case:
+                frames = [{'function': frame['function'], 'line': frame['location']['span'][0] if frame.get('location') else None}
+                          for frame in actual.get('error', {}).get('traceback', [])]
+                passed = passed and frames == case['error_frames']
+            if 'error_context_type' in case:
+                passed = passed and (actual.get('error', {}).get('context') or {}).get('type') == case['error_context_type']
             classification = 'reference'
         else:
             passed = not actual['ok'] and actual.get('error', {}).get('code') == 'UNSUPPORTED'
diff --git a/runtime/functions.mjs b/runtime/functions.mjs
index bebac1f..66a26a2 100644
--- a/runtime/functions.mjs
+++ b/runtime/functions.mjs
@@ -190,7 +190,7 @@ function activation(program, {maxSteps = 10_000, maxWork = 1_000_000, maxDepth =
   const {dispatch, call, deliver, notifyNext, recover, argumentOwner, appendArgument, appendKeyword, expandArguments, keywordArgument, expandMapping, finishArguments, expandDisplay, expandUnpack} = operationRuntime({state, memory, values, classes,
     moduleContext, maxDepth, allocate, mutate, python, hard, charge, enter, bind, block, store, onOutput,
     resumeGenerator: (...args) => resumeGenerator(...args), yieldGenerator: value => yieldGenerator(value),
-    delegateResult: (...args) => delegateResult(...args)});
+    delegateResult: (...args) => delegateResult(...args), injectGenerator: value => injectGenerator(value)});
   const leaveGenerator = (frame, status) => {
     const generator = frame.generator, completion = frame.completion;
     state.temporaries.push(generator, ...completionRoots(completion));
@@ -198,13 +198,15 @@ function activation(program, {maxSteps = 10_000, maxWork = 1_000_000, maxDepth =
     if (!frame.ownsException) frame.activeException = null;
     for (const task of frame.tasks) if (task.type === "try" && !task.previousOwned) task.previous = null;
     generator.status = status; generator.frame = frame;
-    frame.leave(); state.frames.pop();
+    frame.leave(); frame.leave = null; state.frames.pop();
     return completion;
   };
   const yieldGenerator = value => {
     const frame = state.frames.at(-1);
     if (!frame.generator) hard("BYTECODE", "BytecodeError", "Yield requires a generator frame.");
     state.temporaries.push(value);
+    const task = frame.tasks.at(-1);
+    frame.suspensionSite = task.type === "delegate" ? task.site : {function: frame.fn.name, location: state.current.location};
     const mode = frame.generatorMode, site = frame.callsite;
     const completion = leaveGenerator(frame, "suspended");
     if (mode === "close") python("RuntimeError", "generator ignored GeneratorExit");
@@ -215,6 +217,27 @@ function activation(program, {maxSteps = 10_000, maxWork = 1_000_000, maxDepth =
     if (iterator instanceof InstanceValue) return classes.read(iterator, name);
     python("AttributeError", "Delegate has no attribute '" + name + "'");
   };
+  const injectGenerator = value => {
+    const frame = state.frames.at(-1);
+    addTrace(value, frame.suspensionSite);
+    if (frame.ownsException && frame.activeException && frame.activeException !== value) mutate(value, () => {
+      const before = value.context; value.context = frame.activeException;
+      return () => { value.context = before; };
+    });
+    handle(new Raised(value));
+  };
+  const definitionSite = callable => {
+    for (const fn of callable.pool.code.functions) for (const block of fn.blocks) {
+      for (let index = 0; index < block.instructions.length; index++) {
+        charge(1);
+        const [op, target] = block.instructions[index];
+        if (["function", "function-defaults"].includes(op) && target === callable.index)
+          return {function: callable.pool.code.functions[callable.index].name,
+            location: block.source ? {filename: block.source.filename, span: block.source.spans[index]} : null};
+      }
+    }
+    return {function: callable.pool.code.functions[callable.index].name, location: null};
+  };
   const delegateAdvance = (mode, value) => {
     const frame = state.frames.at(-1), task = frame.tasks.at(-1), site = task.site;
     if (mode === "throw" && value.name === "GeneratorExit") mode = "close";
@@ -225,8 +248,8 @@ function activation(program, {maxSteps = 10_000, maxWork = 1_000_000, maxDepth =
     try { plan = delegateMethod(task.iterator, mode); }
     catch (error) {
       if (!(error instanceof Raised) || error.value.name !== "AttributeError" || mode === "send") throw error;
-      if (mode === "close") { handle(new Raised(task.closing)); return; }
-      handle(new Raised(value)); return;
+      if (mode === "close") { injectGenerator(task.closing); return; }
+      injectGenerator(value); return;
     }
     const args = mode === "close" ? [] : [value];
     if (plan.kind === "value") call(plan.value, args, [], [], site, finish);
@@ -238,7 +261,7 @@ function activation(program, {maxSteps = 10_000, maxWork = 1_000_000, maxDepth =
     const frame = state.frames.at(-1), task = frame.tasks.at(-1);
     if (kind === "delegate-iter") { task.iterator = value; delegateAdvance("send", null); }
     else if (kind === "delegate-next") yieldGenerator(value);
-    else if (kind === "delegate-close") handle(new Raised(task.closing));
+    else if (kind === "delegate-close") injectGenerator(task.closing);
     else { frame.tasks.pop(); frame.tasks.at(-1).stack.push(value); }
     return null;
   };
@@ -251,9 +274,10 @@ function activation(program, {maxSteps = 10_000, maxWork = 1_000_000, maxDepth =
     const fresh = generator.status === "created";
     if (fresh && mode === "send" && value !== null) python("TypeError", "can't send non-None value to a just-started generator");
     if (generator.status === "closed" || fresh && mode !== "send") {
+      if (fresh && mode === "throw") addTrace(value, definitionSite(generator.callable));
       generator.status = "closed"; generator.callable = null; generator.bindings.clear();
       if (mode === "close") { dispatch(deliver(null, completion, site)); return; }
-      if (mode === "throw") throw new Raised(value);
+      if (mode === "throw") { addTrace(value, site); throw new Raised(value); }
       python("StopIteration", "");
     }
     state.temporaries.push(generator, value, ...completionRoots(completion));
@@ -275,8 +299,8 @@ function activation(program, {maxSteps = 10_000, maxWork = 1_000_000, maxDepth =
     generator.status = "running";
     const frame = generator.frame; frame.generatorMode = mode;
     if (frame.tasks.at(-1).type === "delegate") delegateAdvance(mode, value);
-    else if (mode === "close") handle(new Raised(allocate(ExceptionValue, "GeneratorExit", [], "")));
-    else if (mode === "throw") handle(new Raised(value));
+    else if (mode === "close") injectGenerator(allocate(ExceptionValue, "GeneratorExit", [], ""));
+    else if (mode === "throw") injectGenerator(value);
     else if (!fresh) frame.tasks.at(-1).stack.push(value);
   };
   const diagnostic = value => {
diff --git a/runtime/operation-runtime.mjs b/runtime/operation-runtime.mjs
index f73a934..020ed8a 100644
--- a/runtime/operation-runtime.mjs
+++ b/runtime/operation-runtime.mjs
@@ -7,7 +7,7 @@ export class Raised { constructor(value) { this.value = value; } }
 // Fixed phases of the existing machine. Python callbacks enter its ordinary
 // frames; destinations use its block stack and single unwinder.
 export function operationRuntime({state, memory, values, classes, moduleContext, maxDepth,
-  allocate, mutate, python, hard, charge, enter, bind, block, store, onOutput, resumeGenerator, yieldGenerator, delegateResult}) {
+  allocate, mutate, python, hard, charge, enter, bind, block, store, onOutput, resumeGenerator, yieldGenerator, delegateResult, injectGenerator}) {
   const count = tag => { state.transitions[tag] = (state.transitions[tag] || 0) + 1; };
   const display = value => {
     if (value instanceof NotImplementedValue) return "NotImplemented";
@@ -668,7 +668,7 @@ export function operationRuntime({state, memory, values, classes, moduleContext,
       count("dispatch:" + task.kind);
       let {callable, args, keywords, keywordValues, site, completion, depth} = task;
       try {
-        if (task.kind === "unary" && task.operation === "delegate-raise") throw new Raised(task.value);
+        if (task.kind === "unary" && task.operation === "delegate-raise") { injectGenerator(task.value); return; }
         if (task.kind === "unary" && task.operation === "unpack-short") {
           state.temporaries = operationRoots(task); python("ValueError", "Not enough values to unpack");
         }
diff --git a/src/pocket_python/_interpreter_lock.py b/src/pocket_python/_interpreter_lock.py
index a148b40..4f9d14e 100644
--- a/src/pocket_python/_interpreter_lock.py
+++ b/src/pocket_python/_interpreter_lock.py
@@ -1,6 +1,6 @@
 """Known source-console assets, canonical LF bytes; refresh with scripts/lock_interpreter.py."""
 
-ENGINE_FINGERPRINT = '838cf574d88d26ca28e945fd3fa077e7c98bf4e19a4bb202429d54beecbef697'
+ENGINE_FINGERPRINT = '0482efe29e46d5f1228ee6d7ce214f1f4168729a55241e4995502e9587cb3ec2'
 ENGINE_FILES = (
     ('browser-protocol.mjs', 10589, '920e8d07c7070995636dff40fdf4333afc9bd4143483db5d8dff82ec1f28ff76'),
     ('bytecode.mjs', 6836, 'e76fabeea879bc1da8016283f7e74df5974479666b100199c2d3c31a53b8ecf4'),
@@ -8,7 +8,7 @@
     ('class-values.mjs', 15372, '67fc606a6c91f7aeb1d4309cc4a0be33778181cdccb51190e5f76d4969d9b43d'),
     ('function-bytecode.mjs', 20438, 'ca6b3abd73d2be35422eea244b876a851bf98e38836e31a33fa6d18d4252ae68'),
     ('function-objects.mjs', 4277, '06af0ca936de1dd336cb7a2ac13f24efae960ea3fe448c93fb95a2e92213c4e2'),
-    ('functions.mjs', 56333, '4450009703952a1dab3c62a94dd84aadeee9c0f2fee0a31db44495eddcc20e96'),
+    ('functions.mjs', 57726, '7d6e4322c31187b12387695dd094a0fd4dab2220cf28c1df2bb4856ccf7ae179'),
     ('interpreter-host.mjs', 7019, '0bb0a64faffcf77e0064258e4cfcaa7a937c4372129849f76901bee91b5a5ae2'),
     ('interpreter-worker.mjs', 8282, '937a97cc49d987492de0bc16021a4a804ef51e4ea5b398f79c92e5d30ac82558'),
     ('library-catalog.mjs', 907, '0adcaae0f6f07b4e1acb22e46493ec99f7247a5828b426c703530d8b2736032c'),
@@ -20,7 +20,7 @@
     ('module-registry.mjs', 10085, 'f23f8313c0804a052cba155e193df920b0221ef978a06f16c1a22f208dfbef91'),
     ('module-session.mjs', 1470, '08e4ccf16361299c15b99621fdfcef0d9ef93de50d28d738158c7bc85a7c23a3'),
     ('numeric.mjs', 13954, '2431f099a7d40aa38d6b3c68b556207752e4191211e01005acde94325bd91bad'),
-    ('operation-runtime.mjs', 93126, '18aff2a37a30c3fe0deebb51dae85f8200f9674588308941f5147ae10c809c9f'),
+    ('operation-runtime.mjs', 93154, '488791c8e00d8e510feaf9bc654f06a6e0bcaed7f8ed6a2024a1a23140713315'),
     ('operations.mjs', 23452, 'bd4c064811e6400576cae60bfcdbd35a76c829a25085794f95520d6307fad78e'),
     ('source-compiler.mjs', 35239, '4201a25a0c45b8fba4777c8e98b75e37f3277888708093a77e2827dec5ff7063'),
     ('source-identifiers.mjs', 25949, '1e4e6a90728a2d9393eb4b2055d4bd759542f4768d1870b508d629c6888e8914'),
diff --git a/tests/fixtures/interpreter/generators.json b/tests/fixtures/interpreter/generators.json
index 03f17eb..0a48922 100644
--- a/tests/fixtures/interpreter/generators.json
+++ b/tests/fixtures/interpreter/generators.json
@@ -307,6 +307,112 @@
       "source": "class D:\n def __iter__(self): return self\n def __next__(self): return 1\n @property\n def throw(self): raise AttributeError(\"missing\")\ndef g(): yield from D()\na=g()\nprint(next(a))\ntry: a.throw(ValueError(\"original\"))\nexcept ValueError as e: print(str(e))\n",
       "stdout": "1\noriginal\n",
       "stage": "G1"
+    },
+    {
+      "id": "injected-yield-trace",
+      "stage": "G1",
+      "source": "def g():\n yield 1\na=g()\nnext(a)\na.throw(ValueError(\"injected\"))\n",
+      "error_type": "ValueError",
+      "error_frames": [
+        {
+          "function": "<module>",
+          "line": 5
+        },
+        {
+          "function": "g",
+          "line": 2
+        }
+      ],
+      "profiles": [
+        "classes-source/1",
+        "core-source/1"
+      ]
+    },
+    {
+      "id": "injected-fresh-trace",
+      "stage": "G1",
+      "source": "def g():\n yield 1\ng().throw(ValueError(\"fresh\"))\n",
+      "error_type": "ValueError",
+      "error_frames": [
+        {
+          "function": "<module>",
+          "line": 3
+        },
+        {
+          "function": "g",
+          "line": 1
+        }
+      ],
+      "profiles": [
+        "classes-source/1",
+        "core-source/1"
+      ]
+    },
+    {
+      "id": "injected-delegated-trace",
+      "stage": "G1",
+      "source": "def inner():\n yield 1\ndef outer():\n yield from inner()\na=outer()\nnext(a)\na.throw(ValueError(\"delegated\"))\n",
+      "error_type": "ValueError",
+      "error_frames": [
+        {
+          "function": "<module>",
+          "line": 7
+        },
+        {
+          "function": "outer",
+          "line": 4
+        },
+        {
+          "function": "inner",
+          "line": 2
+        }
+      ],
+      "profiles": [
+        "classes-source/1",
+        "core-source/1"
+      ]
+    },
+    {
+      "id": "injected-active-context",
+      "stage": "G1",
+      "source": "def g():\n try:\n  raise KeyError(\"saved\")\n except KeyError:\n  yield 1\na=g()\nnext(a)\na.throw(ValueError(\"injected\"))\n",
+      "error_type": "ValueError",
+      "error_frames": [
+        {
+          "function": "<module>",
+          "line": 8
+        },
+        {
+          "function": "g",
+          "line": 5
+        }
+      ],
+      "error_context_type": "KeyError",
+      "profiles": [
+        "classes-source/1",
+        "core-source/1"
+      ]
+    },
+    {
+      "id": "injected-caller-context-isolation",
+      "stage": "G1",
+      "source": "def g():\n yield 1\na=g()\nnext(a)\ntry:\n raise KeyError(\"caller\")\nexcept KeyError:\n a.throw(ValueError(\"injected\"))\n",
+      "error_type": "ValueError",
+      "error_context_type": null,
+      "error_frames": [
+        {
+          "function": "<module>",
+          "line": 8
+        },
+        {
+          "function": "g",
+          "line": 2
+        }
+      ],
+      "profiles": [
+        "classes-source/1",
+        "core-source/1"
+      ]
     }
   ]
 }