diff --git a/src/main/agent-runtime/context-compactor.ts b/src/main/agent-runtime/context-compactor.ts
index 2e9b3487..a7d04137 100644
--- a/src/main/agent-runtime/context-compactor.ts
+++ b/src/main/agent-runtime/context-compactor.ts
@@ -41,11 +41,16 @@ const RECENT_MESSAGE_TAIL = 20;
 const CHARS_PER_TOKEN = 2;
 /** Per-assistant-message summary cap to keep the compacted turn readable. */
 const MAX_SUMMARY_CHARS_PER_MESSAGE = 160;
+const MAX_TOOL_RESULT_LINES = 12;
+const MAX_TOOL_RESULT_FACTS = 10;
+const MAX_FACT_VALUE_CHARS = 120;
 
 interface MessageLike {
   role?: string;
   content?: unknown;
   timestamp?: number;
+  toolCallId?: string;
+  details?: unknown;
 }
 
 export interface CompactionOutcome {
@@ -180,6 +185,14 @@ function buildSummaryText(older: AgentMessage[]): string {
       lines.push(`- ${point}`);
     }
   }
+  const toolResultFacts = collectToolResultFacts(older);
+  if (toolResultFacts.length > 0) {
+    lines.push("");
+    lines.push("Tool results:");
+    for (const fact of toolResultFacts) {
+      lines.push(`- ${fact}`);
+    }
+  }
   lines.push("");
   lines.push(`(${older.length} earlier message${older.length === 1 ? "" : "s"} compacted.)`);
   return lines.join("\n");
@@ -208,6 +221,107 @@ function collectAssistantHighlights(messages: AgentMessage[]): string[] {
   return highlights;
 }
 
+function collectToolResultFacts(messages: AgentMessage[]): string[] {
+  const toolNamesById = collectToolNamesById(messages);
+  const facts: string[] = [];
+  for (const message of messages) {
+    const raw = message as MessageLike;
+    if (raw.role !== "toolResult") continue;
+    const toolCallId = raw.toolCallId ?? "unknown";
+    const toolName = toolNamesById.get(toolCallId) ?? "tool";
+    const resultFacts = collectFactsFromToolResult(raw);
+    const factText =
+      resultFacts.length > 0
+        ? resultFacts.slice(0, MAX_TOOL_RESULT_FACTS).join("; ")
+        : `result=${truncate(firstSentence(extractTextForEstimate(raw)), MAX_FACT_VALUE_CHARS)}`;
+    facts.push(`${toolName} ${toolCallId}: ${factText}`);
+    if (facts.length >= MAX_TOOL_RESULT_LINES) break;
+  }
+  return facts;
+}
+
+function collectToolNamesById(messages: AgentMessage[]): Map<string, string> {
+  const names = new Map<string, string>();
+  for (const message of messages) {
+    const raw = message as MessageLike;
+    if (raw.role !== "assistant" || !Array.isArray(raw.content)) continue;
+    for (const block of raw.content) {
+      if (!block || typeof block !== "object") continue;
+      const obj = block as { type?: string; id?: string; name?: string };
+      if (obj.type === "toolCall" && typeof obj.id === "string" && typeof obj.name === "string") {
+        names.set(obj.id, obj.name);
+      }
+    }
+  }
+  return names;
+}
+
+function collectFactsFromToolResult(message: MessageLike): string[] {
+  const facts = new Map<string, string>();
+  if (message.toolCallId) facts.set("toolCallId", message.toolCallId);
+  collectStructuredFacts(message.details, facts);
+  const text = extractTextForEstimate(message).trim();
+  collectStructuredFacts(parseJsonObject(text), facts);
+  collectTextFacts(text, facts);
+  return [...facts.entries()].map(([key, value]) => `${key}=${value}`);
+}
+
+function parseJsonObject(text: string): unknown {
+  if (!text.startsWith("{") && !text.startsWith("[")) return null;
+  try {
+    return JSON.parse(text) as unknown;
+  } catch {
+    return null;
+  }
+}
+
+function collectStructuredFacts(value: unknown, facts: Map<string, string>, path: string[] = []): void {
+  if (facts.size >= MAX_TOOL_RESULT_FACTS) return;
+  if (value === null || value === undefined) return;
+  if (typeof value === "string" || typeof value === "number" || typeof value === "boolean") {
+    const key = path.at(-1);
+    if (key && shouldPreserveFactKey(key)) {
+      facts.set(key, truncate(String(value), MAX_FACT_VALUE_CHARS));
+    }
+    return;
+  }
+  if (Array.isArray(value)) {
+    for (const item of value.slice(0, 8)) {
+      collectStructuredFacts(item, facts, path);
+    }
+    return;
+  }
+  if (typeof value !== "object") return;
+  for (const [key, nested] of Object.entries(value as Record<string, unknown>)) {
+    collectStructuredFacts(nested, facts, [...path, key]);
+  }
+}
+
+function collectTextFacts(text: string, facts: Map<string, string>): void {
+  const pattern = /\b(taskId|approvalId|messageId|status|state|decision|error)\s*[:=]\s*("[^"]+"|'[^']+'|[^,;\s}]+)/g;
+  for (const match of text.matchAll(pattern)) {
+    const key = match[1];
+    const rawValue = match[2];
+    if (!key || !rawValue || facts.has(key)) continue;
+    facts.set(key, truncate(rawValue.replace(/^["']|["']$/g, ""), MAX_FACT_VALUE_CHARS));
+    if (facts.size >= MAX_TOOL_RESULT_FACTS) break;
+  }
+}
+
+function shouldPreserveFactKey(key: string): boolean {
+  const lower = key.toLowerCase();
+  return (
+    lower === "id" ||
+    lower.endsWith("id") ||
+    lower.endsWith("_id") ||
+    lower === "status" ||
+    lower === "state" ||
+    lower === "error" ||
+    lower === "decision" ||
+    lower === "ok"
+  );
+}
+
 function firstSentence(text: string): string {
   const collapsed = text.replace(/\s+/g, " ").trim();
   const sentenceEnd = collapsed.search(/[.?!](\s|$)/);
diff --git a/tests/unit/context-compactor-tool-results.test.ts b/tests/unit/context-compactor-tool-results.test.ts
new file mode 100644
index 00000000..9c9e5b22
--- /dev/null
+++ b/tests/unit/context-compactor-tool-results.test.ts
@@ -0,0 +1,87 @@
+import type { AgentMessage } from "@mariozechner/pi-agent-core";
+import { describe, expect, it } from "vitest";
+import { compactMessagesIfNeeded } from "../../src/main/agent-runtime/context-compactor";
+
+function textOf(message: AgentMessage): string {
+  const content = (message as { content?: unknown }).content;
+  if (!Array.isArray(content)) return "";
+  const first = content[0] as { text?: string } | undefined;
+  return first?.text ?? "";
+}
+
+function makeLongTranscript(olderFacts: AgentMessage[]): AgentMessage[] {
+  const messages: AgentMessage[] = [
+    {
+      role: "user",
+      content: [{ type: "text", text: `Ship the approval workflow.\n${"context ".repeat(12_000)}` }],
+      timestamp: 1,
+    } as AgentMessage,
+    ...olderFacts,
+  ];
+
+  for (let i = 0; i < 42; i += 1) {
+    messages.push({
+      role: i % 2 === 0 ? "user" : "assistant",
+      content: [{ type: "text", text: `recent turn ${i}\n${"tail ".repeat(4_000)}` }],
+      timestamp: 100 + i,
+    } as AgentMessage);
+  }
+  return messages;
+}
+
+describe("context compactor tool result facts", () => {
+  it("preserves task, approval, message, status, decision, and error facts from tool results", () => {
+    const messages = makeLongTranscript([
+      {
+        role: "assistant",
+        content: [
+          { type: "text", text: "I will request approval for the deliverable." },
+          {
+            type: "toolCall",
+            id: "call-approval",
+            name: "file_approval",
+            args: { taskId: "task_123" },
+          },
+        ],
+        timestamp: 2,
+      } as AgentMessage,
+      {
+        role: "toolResult",
+        toolCallId: "call-approval",
+        content: [{
+          type: "text",
+          text: JSON.stringify({
+            ok: false,
+            taskId: "task_123",
+            approvalId: "approval_456",
+            messageId: "message_789",
+            status: "blocked",
+            decision: "requires_human_review",
+            error: "missing reviewer",
+          }),
+        }],
+        details: {
+          taskId: "task_123",
+          approvalId: "approval_456",
+          messageId: "message_789",
+          status: "blocked",
+          decision: "requires_human_review",
+          error: "missing reviewer",
+        },
+        timestamp: 3,
+      } as AgentMessage,
+    ]);
+
+    const outcome = compactMessagesIfNeeded(messages);
+    expect(outcome.changed).toBe(true);
+    const summary = textOf(outcome.messages?.[0] as AgentMessage);
+
+    expect(summary).toContain("file_approval");
+    expect(summary).toContain("taskId=task_123");
+    expect(summary).toContain("approvalId=approval_456");
+    expect(summary).toContain("messageId=message_789");
+    expect(summary).toContain("status=blocked");
+    expect(summary).toContain("decision=requires_human_review");
+    expect(summary).toContain("error=missing reviewer");
+  });
+});