perf: cache review prompt assets

CHANGELOG.md

@@ -100,6 +100,8 @@ checkpoint, and status-only commits are intentionally omitted.
   commit lists no longer process entries that are omitted from Codex input.
 - Thanks @stainlu for the repair prompt, GitHub pagination, lazy context
   compaction, and review telemetry PRs.
+- Cached the static review prompt and decision schema within each ClawSweeper
+  process instead of re-reading them during review planning and item prompts.
 
 ## 0.2.0 - 2026-05-03
 

src/clawsweeper.ts

@@ -639,6 +639,8 @@ const DEFAULT_CODEX_MODEL = "gpt-5.5";
 const DEFAULT_REASONING_EFFORT = "high";
 const DEFAULT_SERVICE_TIER = "";
 const REVIEW_POLICY_VERSION = "2026-05-05-policy-v13";
+const REVIEW_ITEM_PROMPT_PATH = join(ROOT, "prompts", "review-item.md");
+const CLAWSWEEPER_DECISION_SCHEMA_PATH = join(ROOT, "schema", "clawsweeper-decision.schema.json");
 const REVIEW_COMMENT_MARKER_PREFIX = "<!-- clawsweeper-review";
 const REVIEW_START_STATUS_MARKER_PREFIX = "<!-- clawsweeper-review-status";
 const AUTOMERGE_LABEL = "clawsweeper:automerge";
@@ -1069,6 +1071,9 @@ function sha256(text: string): string {
   return createHash("sha256").update(text).digest("hex");
 }
 
+let reviewPromptTemplateCache: string | undefined;
+let reviewDecisionSchemaCache: string | undefined;
+
 function itemSnapshotHash(item: Item, context: ItemContext): string {
   const snapshotItem = {
     repo: item.repo,
@@ -3243,12 +3248,14 @@ function gitInfo(openclawDir: string): GitInfo {
   return { mainSha, latestRelease };
 }
 
-function reviewPromptTemplate(): string {
-  return readFileSync(join(ROOT, "prompts", "review-item.md"), "utf8");
+export function reviewPromptTemplate(): string {
+  reviewPromptTemplateCache ??= readFileSync(REVIEW_ITEM_PROMPT_PATH, "utf8");
+  return reviewPromptTemplateCache;
 }
 
-function reviewDecisionSchemaText(): string {
-  return readFileSync(join(ROOT, "schema", "clawsweeper-decision.schema.json"), "utf8");
+export function reviewDecisionSchemaText(): string {
+  reviewDecisionSchemaCache ??= readFileSync(CLAWSWEEPER_DECISION_SCHEMA_PATH, "utf8");
+  return reviewDecisionSchemaCache;
 }
 
 function contextJsonForPrompt(context: ItemContext): string {
@@ -3465,7 +3472,7 @@ function runCodex(options: {
       "-C",
       options.openclawDir,
       "--output-schema",
-      join(ROOT, "schema", "clawsweeper-decision.schema.json"),
+      CLAWSWEEPER_DECISION_SCHEMA_PATH,
       "--output-last-message",
       outputPath,
       "--sandbox",
@@ -7735,7 +7742,7 @@ function statusCommand(args: Args): void {
 }
 
 function checkCommand(): void {
-  JSON.parse(readFileSync(join(ROOT, "schema", "clawsweeper-decision.schema.json"), "utf8"));
+  JSON.parse(reviewDecisionSchemaText());
   if (!existsSync(join(ROOT, ".github", "workflows", "sweep.yml")))
     throw new Error("Missing workflow");
   console.log("ok");

test/clawsweeper.test.ts

@@ -38,7 +38,9 @@ import {
   reviewActionForDecision,
   reviewPriority,
   renderReviewCommentFromReport,
+  reviewDecisionSchemaText,
   reviewPromptTelemetryForTest,
+  reviewPromptTemplate,
   runtimeBudgetExceeded,
   safeOutputTail,
   sameAuthorCounterpartApplyReason,
@@ -213,6 +215,14 @@ test("compactMappedSlice maps every entry when no compaction is needed", () => {
   assert.deepEqual(mapped, [1, 2, 3]);
 });
 
+test("review prompt assets match tracked files", () => {
+  assert.equal(reviewPromptTemplate(), readFileSync("prompts/review-item.md", "utf8"));
+  assert.deepEqual(
+    JSON.parse(reviewDecisionSchemaText()),
+    JSON.parse(readFileSync("schema/clawsweeper-decision.schema.json", "utf8")),
+  );
+});
+
 test("main CLI args ignore package-manager double dash separators", () => {
   assert.deepEqual(parseClawsweeperArgs(["apply-decisions", "--", "--dry-run"]), {
     _: ["apply-decisions"],