fix: compact lcm describe details

Author: jalehman

.changeset/lcm-describe-compact-details.md

@@ -0,0 +1,5 @@
+---
+"@martian-engineering/lossless-claw": patch
+---
+
+Keep lcm_describe tool result details compact so OpenClaw post-processing middleware accepts large summary descriptions.

src/tools/lcm-describe-tool.ts

@@ -55,6 +55,32 @@ function normalizeRequestedTokenCap(value: unknown): number | undefined {
   return Math.max(1, Math.trunc(value));
 }
 
+function compactDescribeDetails(result: Awaited<ReturnType<LcmContextEngine["getRetrieval"]>["describe"]>) {
+  if (!result) {
+    return result;
+  }
+  if (result.type === "summary" && result.summary) {
+    const { content: _content, subtree: _subtree, ...summary } = result.summary;
+    return {
+      id: result.id,
+      type: result.type,
+      summary,
+    };
+  }
+  if (result.type === "file" && result.file) {
+    const { explorationSummary: _explorationSummary, storageUri: _storageUri, ...file } = result.file;
+    return {
+      id: result.id,
+      type: result.type,
+      file: {
+        ...file,
+        hasExplorationSummary: Boolean(result.file.explorationSummary),
+      },
+    };
+  }
+  return { id: result.id, type: result.type };
+}
+
 export function createLcmDescribeTool(input: {
   deps: LcmDependencies;
   lcm?: LcmContextEngine;
@@ -203,7 +229,7 @@ export function createLcmDescribeTool(input: {
         return {
           content: [{ type: "text", text: lines.join("\n") }],
           details: {
-            ...result,
+            ...compactDescribeDetails(result),
             manifest: {
               tokenCap: resolvedTokenCap,
               budgetSource:
@@ -242,7 +268,7 @@ export function createLcmDescribeTool(input: {
 
         return {
           content: [{ type: "text", text: lines.join("\n") }],
-          details: result,
+          details: compactDescribeDetails(result),
         };
       }
 

test/lcm-tools.test.ts

@@ -409,5 +409,18 @@ describe("LCM tools session scoping", () => {
     expect((cross.content[0] as { text: string }).text).toContain(
       formatTimestamp(new Date("2026-01-01T00:00:00.000Z"), timezone),
     );
+    expect(cross.details).toMatchObject({
+      id: "sum_foreign",
+      type: "summary",
+      summary: {
+        conversationId: 99,
+        tokenCount: 12,
+      },
+      manifest: {
+        tokenCap: 120,
+      },
+    });
+    expect(JSON.stringify(cross.details)).not.toContain("foreign summary");
+    expect(JSON.stringify(cross.details)).not.toContain("subtree");
   });
 });