fix(hooks): restore grep truncation by removing unused grep-output-truncator (#120)

The grep-output-truncator hook was never registered in index.ts, so grep
output was not being truncated since commit 03a4501 which removed grep/Grep
from tool-output-truncator's TRUNCATABLE_TOOLS list.

- Remove unused grep-output-truncator.ts
- Add "grep" and "Grep" back to tool-output-truncator's TRUNCATABLE_TOOLS

Co-authored-by: Claude <noreply@anthropic.com>

src/hooks/grep-output-truncator.ts

@@ -1,131 +0,0 @@
-import type { PluginInput } from "@opencode-ai/plugin"
-
-const ANTHROPIC_ACTUAL_LIMIT = 200_000
-const CHARS_PER_TOKEN_ESTIMATE = 4
-const TARGET_MAX_TOKENS = 50_000
-
-interface AssistantMessageInfo {
-  role: "assistant"
-  tokens: {
-    input: number
-    output: number
-    reasoning: number
-    cache: { read: number; write: number }
-  }
-}
-
-interface MessageWrapper {
-  info: { role: string } & Partial<AssistantMessageInfo>
-}
-
-function estimateTokens(text: string): number {
-  return Math.ceil(text.length / CHARS_PER_TOKEN_ESTIMATE)
-}
-
-function truncateToTokenLimit(output: string, maxTokens: number): { result: string; truncated: boolean } {
-  const currentTokens = estimateTokens(output)
-
-  if (currentTokens <= maxTokens) {
-    return { result: output, truncated: false }
-  }
-
-  const lines = output.split("\n")
-
-  if (lines.length <= 3) {
-    const maxChars = maxTokens * CHARS_PER_TOKEN_ESTIMATE
-    return {
-      result: output.slice(0, maxChars) + "\n\n[Output truncated due to context window limit]",
-      truncated: true,
-    }
-  }
-
-  const headerLines = lines.slice(0, 3)
-  const contentLines = lines.slice(3)
-
-  const headerText = headerLines.join("\n")
-  const headerTokens = estimateTokens(headerText)
-  const availableTokens = maxTokens - headerTokens - 50
-
-  if (availableTokens <= 0) {
-    return {
-      result: headerText + "\n\n[Content truncated due to context window limit]",
-      truncated: true,
-    }
-  }
-
-  let resultLines: string[] = []
-  let currentTokenCount = 0
-
-  for (const line of contentLines) {
-    const lineTokens = estimateTokens(line + "\n")
-    if (currentTokenCount + lineTokens > availableTokens) {
-      break
-    }
-    resultLines.push(line)
-    currentTokenCount += lineTokens
-  }
-
-  const truncatedContent = [...headerLines, ...resultLines].join("\n")
-  const removedCount = contentLines.length - resultLines.length
-
-  return {
-    result: truncatedContent + `\n\n[${removedCount} more lines truncated due to context window limit]`,
-    truncated: true,
-  }
-}
-
-export function createGrepOutputTruncatorHook(ctx: PluginInput) {
-  const GREP_TOOLS = ["grep", "Grep", "safe_grep"]
-
-  const toolExecuteAfter = async (
-    input: { tool: string; sessionID: string; callID: string },
-    output: { title: string; output: string; metadata: unknown }
-  ) => {
-    if (!GREP_TOOLS.includes(input.tool)) return
-
-    const { sessionID } = input
-
-    try {
-      const response = await ctx.client.session.messages({
-        path: { id: sessionID },
-      })
-
-      const messages = (response.data ?? response) as MessageWrapper[]
-
-      const assistantMessages = messages
-        .filter((m) => m.info.role === "assistant")
-        .map((m) => m.info as AssistantMessageInfo)
-
-      if (assistantMessages.length === 0) return
-
-      // Use only the last assistant message's input tokens
-      // This reflects the ACTUAL current context window usage (post-compaction)
-      const lastAssistant = assistantMessages[assistantMessages.length - 1]
-      const lastTokens = lastAssistant.tokens
-      const totalInputTokens = (lastTokens?.input ?? 0) + (lastTokens?.cache?.read ?? 0)
-
-      const remainingTokens = ANTHROPIC_ACTUAL_LIMIT - totalInputTokens
-
-      const maxOutputTokens = Math.min(
-        remainingTokens * 0.5,
-        TARGET_MAX_TOKENS
-      )
-
-      if (maxOutputTokens <= 0) {
-        output.output = "[Output suppressed - context window exhausted]"
-        return
-      }
-
-      const { result, truncated } = truncateToTokenLimit(output.output, maxOutputTokens)
-      if (truncated) {
-        output.output = result
-      }
-    } catch {
-      // Graceful degradation
-    }
-  }
-
-  return {
-    "tool.execute.after": toolExecuteAfter,
-  }
-}

src/hooks/index.ts

@@ -3,7 +3,6 @@ export { createContextWindowMonitorHook } from "./context-window-monitor";
 export { createSessionNotification } from "./session-notification";
 export { createSessionRecoveryHook, type SessionRecoveryHook, type SessionRecoveryOptions } from "./session-recovery";
 export { createCommentCheckerHooks } from "./comment-checker";
-export { createGrepOutputTruncatorHook } from "./grep-output-truncator";
 export { createToolOutputTruncatorHook } from "./tool-output-truncator";
 export { createDirectoryAgentsInjectorHook } from "./directory-agents-injector";
 export { createDirectoryReadmeInjectorHook } from "./directory-readme-injector";

src/hooks/tool-output-truncator.ts

@@ -1,8 +1,9 @@
 import type { PluginInput } from "@opencode-ai/plugin"
 import { createDynamicTruncator } from "../shared/dynamic-truncator"
 
-// Note: "grep" and "Grep" are handled by dedicated grep-output-truncator.ts
 const TRUNCATABLE_TOOLS = [
+  "grep",
+  "Grep",
   "safe_grep",
   "glob",
   "Glob",