fix(hooks): harden json-error-recovery matching and scope

src/hooks/json-error-recovery/hook.ts

@@ -1,12 +1,30 @@
 import type { PluginInput } from "@opencode-ai/plugin"
 
-export const JSON_ERROR_PATTERNS = [
+export const JSON_ERROR_TOOL_EXCLUDE_LIST = [
-  "json parse error",
+  "bash",
-  "syntaxerror: unexpected token",
+  "read",
-  "expected '}'",
+  "glob",
-  "unexpected eof",
+  "grep",
+  "webfetch",
+  "look_at",
+  "grep_app_searchgithub",
+  "websearch_web_search_exa",
 ] as const
 
+export const JSON_ERROR_PATTERNS = [
+  /json parse error/i,
+  /failed to parse json/i,
+  /invalid json/i,
+  /malformed json/i,
+  /unexpected end of json input/i,
+  /syntaxerror:\s*unexpected token.*json/i,
+  /json[^\n]*expected '\}'/i,
+  /json[^\n]*unexpected eof/i,
+] as const
+
+const JSON_ERROR_REMINDER_MARKER = "[JSON PARSE ERROR - IMMEDIATE ACTION REQUIRED]"
+const JSON_ERROR_EXCLUDED_TOOLS = new Set<string>(JSON_ERROR_TOOL_EXCLUDE_LIST)
+
 export const JSON_ERROR_REMINDER = `
 [JSON PARSE ERROR - IMMEDIATE ACTION REQUIRED]
 
@@ -23,15 +41,14 @@ DO NOT repeat the exact same invalid call.
 export function createJsonErrorRecoveryHook(_ctx: PluginInput) {
   return {
     "tool.execute.after": async (
-      _input: { tool: string; sessionID: string; callID: string },
+      input: { tool: string; sessionID: string; callID: string },
       output: { title: string; output: string; metadata: unknown }
     ) => {
+      if (JSON_ERROR_EXCLUDED_TOOLS.has(input.tool.toLowerCase())) return
       if (typeof output.output !== "string") return
+      if (output.output.includes(JSON_ERROR_REMINDER_MARKER)) return
 
-      const outputLower = output.output.toLowerCase()
+      const hasJsonError = JSON_ERROR_PATTERNS.some((pattern) => pattern.test(output.output))
-      const hasJsonError = JSON_ERROR_PATTERNS.some((pattern) =>
-        outputLower.includes(pattern)
-      )
 
       if (hasJsonError) {
         output.output += `\n${JSON_ERROR_REMINDER}`

src/hooks/json-error-recovery/index.test.ts

@@ -1,65 +1,196 @@
 import { beforeEach, describe, expect, it } from "bun:test"
+import type { PluginInput } from "@opencode-ai/plugin"
 
 import {
   createJsonErrorRecoveryHook,
   JSON_ERROR_PATTERNS,
   JSON_ERROR_REMINDER,
+  JSON_ERROR_TOOL_EXCLUDE_LIST,
 } from "./index"
 
 describe("createJsonErrorRecoveryHook", () => {
   let hook: ReturnType<typeof createJsonErrorRecoveryHook>
 
+  type ToolExecuteAfterHandler = NonNullable<
+    ReturnType<typeof createJsonErrorRecoveryHook>["tool.execute.after"]
+  >
+  type ToolExecuteAfterInput = Parameters<ToolExecuteAfterHandler>[0]
+  type ToolExecuteAfterOutput = Parameters<ToolExecuteAfterHandler>[1]
+
+  const createMockPluginInput = (): PluginInput => {
+    return {
+      client: {} as PluginInput["client"],
+      directory: "/tmp/test",
+    } as PluginInput
+  }
+
   beforeEach(() => {
-    hook = createJsonErrorRecoveryHook({} as any)
+    hook = createJsonErrorRecoveryHook(createMockPluginInput())
   })
 
   describe("tool.execute.after", () => {
-    const createInput = () => ({
+    const createInput = (tool = "Edit"): ToolExecuteAfterInput => ({
-      tool: "Read",
+      tool,
       sessionID: "test-session",
       callID: "test-call-id",
     })
 
-    const createOutput = (outputText: string) => ({
+    const createOutput = (outputText: string): ToolExecuteAfterOutput => ({
       title: "Tool Error",
       output: outputText,
       metadata: {},
     })
 
-    it("appends reminder when output includes JSON parse error", async () => {
+    const createUnknownOutput = (value: unknown): { title: string; output: unknown; metadata: Record<string, unknown> } => ({
-      const input = createInput()
+      title: "Tool Error",
-      const output = createOutput("JSON Parse error: Expected '}'")
+      output: value,
+      metadata: {},
+    })
 
+    it("appends reminder when output includes JSON parse error", async () => {
+      // given
+      const input = createInput()
+      const output = createOutput("JSON parse error: expected '}' in JSON body")
+
+      // when
       await hook["tool.execute.after"](input, output)
 
+      // then
       expect(output.output).toContain(JSON_ERROR_REMINDER)
     })
 
     it("appends reminder when output includes SyntaxError", async () => {
+      // given
       const input = createInput()
       const output = createOutput("SyntaxError: Unexpected token in JSON at position 10")
 
+      // when
       await hook["tool.execute.after"](input, output)
 
+      // then
       expect(output.output).toContain(JSON_ERROR_REMINDER)
     })
 
     it("does not append reminder for normal output", async () => {
+      // given
       const input = createInput()
       const output = createOutput("Task completed successfully")
 
+      // when
       await hook["tool.execute.after"](input, output)
 
+      // then
       expect(output.output).toBe("Task completed successfully")
     })
+
+    it("does not append reminder for empty output", async () => {
+      // given
+      const input = createInput()
+      const output = createOutput("")
+
+      // when
+      await hook["tool.execute.after"](input, output)
+
+      // then
+      expect(output.output).toBe("")
+    })
+
+    it("does not append reminder for false positive non-JSON text", async () => {
+      // given
+      const input = createInput()
+      const output = createOutput("Template failed: expected '}' before newline")
+
+      // when
+      await hook["tool.execute.after"](input, output)
+
+      // then
+      expect(output.output).toBe("Template failed: expected '}' before newline")
+    })
+
+    it("does not append reminder for excluded tools", async () => {
+      // given
+      const input = createInput("Read")
+      const output = createOutput("JSON parse error: unexpected end of JSON input")
+
+      // when
+      await hook["tool.execute.after"](input, output)
+
+      // then
+      expect(output.output).toBe("JSON parse error: unexpected end of JSON input")
+    })
+
+    it("does not append reminder when reminder already exists", async () => {
+      // given
+      const input = createInput()
+      const output = createOutput(`JSON parse error: invalid JSON\n${JSON_ERROR_REMINDER}`)
+
+      // when
+      await hook["tool.execute.after"](input, output)
+
+      // then
+      const reminderCount = output.output.split("[JSON PARSE ERROR - IMMEDIATE ACTION REQUIRED]").length - 1
+      expect(reminderCount).toBe(1)
+    })
+
+    it("does not append duplicate reminder on repeated execution", async () => {
+      // given
+      const input = createInput()
+      const output = createOutput("JSON parse error: invalid JSON arguments")
+
+      // when
+      await hook["tool.execute.after"](input, output)
+      await hook["tool.execute.after"](input, output)
+
+      // then
+      const reminderCount = output.output.split("[JSON PARSE ERROR - IMMEDIATE ACTION REQUIRED]").length - 1
+      expect(reminderCount).toBe(1)
+    })
+
+    it("ignores non-string output values", async () => {
+      // given
+      const input = createInput()
+      const values: unknown[] = [42, null, undefined, { error: "invalid json" }]
+
+      // when
+      for (const value of values) {
+        const output = createUnknownOutput(value)
+        await hook["tool.execute.after"](input, output as ToolExecuteAfterOutput)
+
+        // then
+        expect(output.output).toBe(value)
+      }
+    })
   })
 
   describe("JSON_ERROR_PATTERNS", () => {
     it("contains known parse error patterns", () => {
-      expect(JSON_ERROR_PATTERNS).toContain("json parse error")
+      // given
-      expect(JSON_ERROR_PATTERNS).toContain("syntaxerror: unexpected token")
+      const output = "JSON parse error: unexpected end of JSON input"
-      expect(JSON_ERROR_PATTERNS).toContain("expected '}'")
+
-      expect(JSON_ERROR_PATTERNS).toContain("unexpected eof")
+      // when
+      const isMatched = JSON_ERROR_PATTERNS.some((pattern) => pattern.test(output))
+
+      // then
+      expect(isMatched).toBe(true)
+    })
+  })
+
+  describe("JSON_ERROR_TOOL_EXCLUDE_LIST", () => {
+    it("contains content-heavy tools that should be excluded", () => {
+      // given
+      const expectedExcludedTools: Array<(typeof JSON_ERROR_TOOL_EXCLUDE_LIST)[number]> = [
+        "read",
+        "bash",
+        "webfetch",
+      ]
+
+      // when
+      const allExpectedToolsIncluded = expectedExcludedTools.every((toolName) =>
+        JSON_ERROR_TOOL_EXCLUDE_LIST.includes(toolName)
+      )
+
+      // then
+      expect(allExpectedToolsIncluded).toBe(true)
     })
   })
 })

src/hooks/json-error-recovery/index.ts

@@ -1,5 +1,6 @@
 export {
   createJsonErrorRecoveryHook,
+  JSON_ERROR_TOOL_EXCLUDE_LIST,
   JSON_ERROR_PATTERNS,
   JSON_ERROR_REMINDER,
 } from "./hook"