diff --git a/changelog.d/user-interrupt-not-failure.fixed.md b/changelog.d/user-interrupt-not-failure.fixed.md
new file mode 100644
index 0000000..d81dc3f
--- /dev/null
+++ b/changelog.d/user-interrupt-not-failure.fixed.md
@@ -0,0 +1,15 @@
+- A user-initiated stream stop (host Stop button / `cancelStream()`) is no
+  longer recorded as an inference failure. It now emits `inference:aborted`
+  (reason `user`) instead of `inference:exhausted`, leaves the
+  consecutive-failure streak and ops alerts untouched, and writes an honest
+  `[turn-interrupted]` chronicle marker ("deliberate cancellation, not a
+  failure") in place of the misleading `[inference-failed] the model call
+  failed…` text with remediation advice for a failure that never happened.
+- Speech-route failures with no delivery locus (headless/WebUI turns with no
+  home or trigger channel) now read `[send-undeliverable] … had no delivery
+  destination` instead of claiming a Discord delivery failure to "the
+  channel". The machine-readable marker `kind` is unchanged.
+- The event gate's inference buffer no longer drops its oldest pending event
+  silently when full: the drop is logged to stderr with the policy and event
+  type. A dropped event never triggers inference, so a silent drop looked
+  like "message sent, never answered, queue depth 0" from the outside.
diff --git a/src/framework.ts b/src/framework.ts
index 311d884..942e936 100644
--- a/src/framework.ts
+++ b/src/framework.ts
@@ -6872,6 +6872,17 @@ export class AgentFramework {
               }
             }
             const reason = event.reason ?? 'unknown';
+            // Membrane emits reason 'user' exactly when someone called
+            // stream.cancel() — the host's Stop button / Escape / an admin
+            // abort. That is a DELIBERATE cancellation, not a failure: it
+            // must not feed the consecutive-failure streak, ops alerts, or
+            // the "[inference-failed] the model call failed" chronicle
+            // marker, all of which told the agent (in the user's voice!)
+            // that its turn failed and advised remediation for a failure
+            // that never happened. For long-lived residents whose transcript
+            // is memory, those mislabeled cancellations accumulate as false
+            // self-knowledge.
+            const deliberate = reason === 'user';
             // Only reset if this is still the active stream (a budget restart
             // may have already started a new stream, bumping streamId)
             if (agent.streamId === myStreamId) {
@@ -6881,13 +6892,45 @@ export class AgentFramework {
               this.settleAgent(agent.name, {
                 stopReason: 'exhausted',
                 speech: '',
-                error: `Stream aborted: ${reason}`,
-              });
-              this.emitTrace({
-                type: 'inference:exhausted',
-                agentName: agent.name,
-                error: `Stream aborted: ${reason}`,
+                error: deliberate ? 'Stream stopped by user' : `Stream aborted: ${reason}`,
               });
+              if (deliberate) {
+                // Distinct trace type: emitTrace funnels every
+                // inference:exhausted into noteInferenceExhausted (streak,
+                // failures.log, marker); inference:aborted carries the
+                // honest cause without any of that.
+                this.emitTrace({
+                  type: 'inference:aborted',
+                  agentName: agent.name,
+                  reason: 'user',
+                  durationMs,
+                });
+                // Agent-facing marker, honest about what happened and who
+                // acted (no inference triggered → no loop). Same system
+                // envelope as the failure marker so surfaces render it
+                // the same way.
+                try {
+                  agent.getContextManager().addMessage(
+                    'user',
+                    [{
+                      type: 'text',
+                      text:
+                        `[turn-interrupted] Your previous turn was stopped mid-stream ` +
+                        `by the user — a deliberate cancellation, not a failure. Any ` +
+                        `partial output was cut off by the stop and was not delivered.`,
+                    }],
+                    { system: true, kind: 'turn-interrupted', reason },
+                  );
+                } catch (err) {
+                  console.error(`[turn-interrupted] could not record chronicle marker for ${agent.name}:`, err);
+                }
+              } else {
+                this.emitTrace({
+                  type: 'inference:exhausted',
+                  agentName: agent.name,
+                  error: `Stream aborted: ${reason}`,
+                });
+              }
               // Postmortem 2026-05-28 P2 #7: persist the abort to the
               // inference log so future investigations can attribute the
               // terminal cause without relying on live in-memory reducer
@@ -8904,12 +8947,19 @@ export class AgentFramework {
                 ? `${label.startsWith('#') ? label : `#${label}`} (${channelId})`
                 : channelId
               : 'the channel';
+            // No-locus failures (headless/WebUI turns with no home or
+            // trigger channel) are not Discord failures: a "[discord-send-
+            // failed] could not be delivered to the channel" marker sent
+            // the agent debugging a Discord problem that doesn't exist.
+            // The machine-readable `kind` stays stable — the gate's
+            // discord-send-failed-skip intent keys on it — but the text
+            // the agent reads names the real situation.
+            const text = channelId
+              ? `[discord-send-failed] Your previous reply (${textLen} chars) could not be delivered to ${where} (${reason}). It was saved to your archive but the human did not receive it.`
+              : `[send-undeliverable] Your previous reply (${textLen} chars) had no delivery destination — ${reason}. This is a routing/configuration situation, not a channel failure. The reply was saved to your archive but was not delivered anywhere.`;
             this.addMessage(
               'user',
-              [{
-                type: 'text',
-                text: `[discord-send-failed] Your previous reply (${textLen} chars) could not be delivered to ${where} (${reason}). It was saved to your archive but the human did not receive it.`,
-              }],
+              [{ type: 'text', text }],
               { system: true, kind: 'discord-send-failed', channelId: channelId ?? '', reason },
             );
           } catch (err) {
diff --git a/src/gate/event-gate.ts b/src/gate/event-gate.ts
index a88dbaf..ba9e2a0 100644
--- a/src/gate/event-gate.ts
+++ b/src/gate/event-gate.ts
@@ -1513,7 +1513,18 @@ export class EventGate {
   private bufferForInference(events: PendingEvent[]): void {
     for (const event of events) {
       if (this.inferenceBuffer.length >= MAX_INFERENCE_BUFFER) {
-        this.inferenceBuffer.shift(); // Drop oldest
+        // Never drop silently: a discarded event here is a message that was
+        // persisted but will never trigger a wake — from the outside it
+        // looks like "sent, ignored, queue depth 0". If this line ever
+        // shows up in logs, the buffer is wedged (see flush gate on
+        // `inferring`) or genuinely overwhelmed; either way the operator
+        // needs to know which events died.
+        const dropped = this.inferenceBuffer.shift()!;
+        console.error(
+          `[event-gate] inference buffer full (${MAX_INFERENCE_BUFFER}): dropping oldest ` +
+          `pending event (policy=${dropped.policyName}, type=${dropped.eventType}) to admit ` +
+          `a newer one. Dropped events never trigger inference.`,
+        );
       }
       this.inferenceBuffer.push(event);
     }
diff --git a/test/user-interrupt-not-failure.test.ts b/test/user-interrupt-not-failure.test.ts
new file mode 100644
index 0000000..ca559d0
--- /dev/null
+++ b/test/user-interrupt-not-failure.test.ts
@@ -0,0 +1,186 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert/strict';
+import { mkdtempSync, rmSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import type {
+  EventResponse,
+  Module,
+  ModuleContext,
+  ProcessEvent,
+  ProcessState,
+  ToolCall,
+  ToolDefinition,
+  ToolResult,
+  TraceEvent,
+} from '../src/index.js';
+import { AgentFramework } from '../src/index.js';
+import { createMockResponse, MockMembrane } from './helpers/mock-membrane.js';
+
+/**
+ * A user pressing Stop is a deliberate cancellation, not a model failure.
+ * Before the fix, the host's cancelStream() path fell through driveStream's
+ * generic abort handling into the failure pipeline: an inference:exhausted
+ * trace, a bumped consecutive-failure streak (three Stops → hard-down ops
+ * alert), and an "[inference-failed] the model call failed and produced no
+ * response … drop an oversized attachment" chronicle marker attributed to
+ * the user — three inaccuracies (wrong cause, wrong speaker, irrelevant
+ * advice) accumulating as false self-knowledge in a resident's transcript.
+ */
+
+/** Module whose tool call hangs until released — keeps the stream open so
+ *  the test can cancel mid-turn, exactly as the TUI/WebUI Stop button does. */
+class HangingToolModule implements Module {
+  readonly name = 'test';
+  release!: () => void;
+  private readonly gate = new Promise<void>((resolve) => { this.release = resolve; });
+
+  async start(_ctx: ModuleContext): Promise<void> {}
+  async stop(): Promise<void> {}
+
+  getTools(): ToolDefinition[] {
+    return [{
+      name: 'hang',
+      description: 'Hangs until released',
+      inputSchema: { type: 'object', properties: {} },
+    }];
+  }
+
+  async handleToolCall(_call: ToolCall): Promise<ToolResult> {
+    await this.gate;
+    return { success: true, data: {} };
+  }
+
+  async onProcess(event: ProcessEvent, _state: ProcessState): Promise<EventResponse> {
+    if (event.type === 'external-message') {
+      return {
+        addMessages: [{ participant: 'User', content: [{ type: 'text', text: String(event.content) }] }],
+        requestInference: true,
+      };
+    }
+    return {};
+  }
+}
+
+async function waitFor(cond: () => boolean, ms = 2000): Promise<void> {
+  const start = Date.now();
+  while (!cond()) {
+    if (Date.now() - start > ms) throw new Error('timeout waiting for condition');
+    await new Promise((r) => setTimeout(r, 10));
+  }
+}
+
+describe('user interrupt is not recorded as a failure', () => {
+  it('cancelStream mid-turn → [turn-interrupted] marker, inference:aborted trace, no failure streak', async () => {
+    const tempDir = mkdtempSync(join(tmpdir(), 'interrupt-'));
+    const membrane = new MockMembrane();
+    // One response with a hanging tool call: the stream stays alive in
+    // waiting_for_tools until we cancel it.
+    membrane.pushResponse(createMockResponse(
+      [{ type: 'tool_use', id: 't1', name: 'test--hang', input: {} } as never],
+      'tool_use',
+    ));
+
+    const module = new HangingToolModule();
+    const framework = await AgentFramework.create({
+      storePath: join(tempDir, 'test.chronicle'),
+      membrane: membrane.asMembrane(),
+      agents: [{ name: 'assistant', model: 'test-model', systemPrompt: 'Assist.' }],
+      modules: [module],
+    });
+
+    const traces: TraceEvent[] = [];
+    framework.onTrace((t) => { traces.push(t); });
+
+    try {
+      framework.pushEvent({ type: 'external-message', source: 'test', content: 'go', metadata: {} });
+      framework.start();
+
+      const agent = framework.getAgent('assistant')!;
+      await waitFor(() => agent.state.status === 'waiting_for_tools');
+
+      // What the TUI / WebUI Stop button does.
+      agent.cancelStream();
+
+      await waitFor(() => traces.some((t) => t.type === 'inference:aborted'));
+      // Let the abort settle fully (chronicle marker write).
+      await waitFor(() => {
+        const { messages } = agent.getContextManager().queryMessages({});
+        return messages.some((m) =>
+          m.content.some((b) => b.type === 'text' && b.text.includes('[turn-interrupted]')));
+      });
+
+      const { messages } = agent.getContextManager().queryMessages({});
+      const texts = messages.flatMap((m) =>
+        m.content.filter((b): b is { type: 'text'; text: string } => b.type === 'text').map((b) => b.text));
+
+      // Honest marker present…
+      const marker = texts.find((t) => t.includes('[turn-interrupted]'));
+      assert.ok(marker, 'expected a [turn-interrupted] chronicle marker');
+      assert.match(marker!, /deliberate cancellation, not a failure/);
+      // …and no failure framing anywhere.
+      assert.ok(!texts.some((t) => t.includes('[inference-failed]')),
+        'a user stop must not produce an [inference-failed] marker');
+
+      // Trace: aborted (with the honest reason), not exhausted.
+      const aborted = traces.find((t) => t.type === 'inference:aborted') as { reason?: string };
+      assert.equal(aborted?.reason, 'user');
+      assert.ok(!traces.some((t) => t.type === 'inference:exhausted'),
+        'a user stop must not emit inference:exhausted (feeds streak + ops alerts)');
+    } finally {
+      // Release the hung tool BEFORE stopping: its completion pushes a
+      // tool-result event, which must land while the queue is still open.
+      module.release();
+      await new Promise((r) => setTimeout(r, 50));
+      await framework.stop();
+      rmSync(tempDir, { recursive: true, force: true });
+    }
+  });
+
+  it('a real provider abort (non-user reason) still goes through the failure pipeline', async () => {
+    const tempDir = mkdtempSync(join(tmpdir(), 'interrupt-real-'));
+    const membrane = new MockMembrane();
+    membrane.pushResponse(createMockResponse(
+      [{ type: 'tool_use', id: 't1', name: 'test--hang', input: {} } as never],
+      'tool_use',
+    ));
+
+    const module = new HangingToolModule();
+    const framework = await AgentFramework.create({
+      storePath: join(tempDir, 'test.chronicle'),
+      membrane: membrane.asMembrane(),
+      agents: [{ name: 'assistant', model: 'test-model', systemPrompt: 'Assist.' }],
+      modules: [module],
+    });
+
+    const traces: TraceEvent[] = [];
+    framework.onTrace((t) => { traces.push(t); });
+
+    try {
+      framework.pushEvent({ type: 'external-message', source: 'test', content: 'go', metadata: {} });
+      framework.start();
+
+      const agent = framework.getAgent('assistant')!;
+      await waitFor(() => agent.state.status === 'waiting_for_tools');
+
+      // Simulate a provider-side abort: emit the event with a non-user
+      // reason directly on the live mock stream.
+      const stream = membrane.lastStream!;
+      (stream as unknown as { events: unknown[]; pendingResolve: (() => void) | null }).events.push(
+        { type: 'aborted', reason: 'connection_lost' });
+      const pr = (stream as unknown as { pendingResolve: (() => void) | null }).pendingResolve;
+      if (pr) { (stream as unknown as { pendingResolve: null }).pendingResolve = null; pr(); }
+
+      await waitFor(() => traces.some((t) => t.type === 'inference:exhausted'));
+      const exhausted = traces.find((t) => t.type === 'inference:exhausted') as { error?: string };
+      assert.match(exhausted?.error ?? '', /connection_lost/);
+    } finally {
+      // Release the hung tool BEFORE stopping: its completion pushes a
+      // tool-result event, which must land while the queue is still open.
+      module.release();
+      await new Promise((r) => setTimeout(r, 50));
+      await framework.stop();
+      rmSync(tempDir, { recursive: true, force: true });
+    }
+  });
+});