fix(hooks): dedupe native agent instructions

src/hooks/directory-agents-injector/injector.test.ts

@@ -173,6 +173,71 @@ describe("processFilePathForAgentsInjection", () => {
     expect(output.output.split("[Directory Context:").length - 1).toBe(2)
   })
 
+  it("dedupes native global Instructions from blocks across reads", async () => {
+    // given
+    const { processFilePathForAgentsInjection } = await import("./injector")
+    const sessionCaches = new Map<string, Set<string>>()
+    const filePath = join(testRoot, "file.ts")
+    const globalAgentsPath = "/Users/example/.config/opencode/AGENTS.md"
+    const globalAgentsContent = "# GLOBAL AGENTS\nglobal directives"
+    const nativeOutput = () => ({
+      title: "Read result",
+      output: `base output\n\nAdditional project instructions matched for ${filePath}:\n\nInstructions from: ${globalAgentsPath}\n${globalAgentsContent}`,
+      metadata: {},
+    })
+    const firstOutput = nativeOutput()
+    const secondOutput = nativeOutput()
+
+    // when
+    await processFilePathForAgentsInjection({
+      ctx: { directory: testRoot } as PluginInput,
+      truncator,
+      sessionCaches,
+      filePath,
+      sessionID: "session-native-global-dedupe",
+      output: firstOutput,
+    })
+    await processFilePathForAgentsInjection({
+      ctx: { directory: testRoot } as PluginInput,
+      truncator,
+      sessionCaches,
+      filePath,
+      sessionID: "session-native-global-dedupe",
+      output: secondOutput,
+    })
+
+    // then
+    expect(firstOutput.output).toContain(`Instructions from: ${globalAgentsPath}`)
+    expect(secondOutput.output).toBe("base output")
+  })
+
+  it("does not add Directory Context when native output already included the same AGENTS.md", async () => {
+    // given
+    const { processFilePathForAgentsInjection } = await import("./injector")
+    const filePath = join(srcDirectory, "file.ts")
+    const srcAgentsPath = join(srcDirectory, "AGENTS.md")
+    const output = {
+      title: "Read result",
+      output: `base output\n\nAdditional project instructions matched for ${filePath}:\n\nInstructions from: ${srcAgentsPath}\n${srcAgentsContent}`,
+      metadata: {},
+    }
+
+    // when
+    await processFilePathForAgentsInjection({
+      ctx: { directory: testRoot } as PluginInput,
+      truncator,
+      sessionCaches: new Map(),
+      filePath,
+      sessionID: "session-native-local-dedupe",
+      output,
+    })
+
+    // then
+    expect(output.output).toContain(`Instructions from: ${srcAgentsPath}`)
+    expect(output.output).not.toContain(`[Directory Context: ${srcAgentsPath}]`)
+    expect(output.output.split(srcAgentsContent).length - 1).toBe(1)
+  })
+
   it("shows truncation notice when content is truncated", async () => {
     // given
     const { processFilePathForAgentsInjection } = await import("./injector")