fix(core): honor configured agent step limits (#33142)

packages/opencode/src/session/prompt.ts

@@ -16,7 +16,7 @@ import { SessionCompaction } from "./compaction"
 import { SystemPrompt } from "./system"
 import { Instruction } from "./instruction"
 import { Plugin } from "../plugin"
-import MAX_STEPS from "../session/prompt/max-steps.txt"
+import { MAX_STEPS_PROMPT } from "@opencode-ai/core/session/runner/max-steps"
 import { ToolRegistry } from "@/tool/registry"
 import { MCP } from "../mcp"
 import { LSP } from "@/lsp/lsp"
@@ -1322,7 +1322,7 @@ export const layer = Layer.effect(
               sessionID,
               parentSessionID: session.parentID,
               system,
-              messages: [...modelMsgs, ...(isLastStep ? [{ role: "assistant" as const, content: MAX_STEPS }] : [])],
+              messages: [...modelMsgs, ...(isLastStep ? [{ role: "assistant" as const, content: MAX_STEPS_PROMPT }] : [])],
               tools,
               model,
               toolChoice: format.type === "json_schema" ? "required" : undefined,

packages/opencode/src/session/prompt/max-steps.txt

@@ -1,16 +0,0 @@
-CRITICAL - MAXIMUM STEPS REACHED
-
-The maximum number of steps allowed for this task has been reached. Tools are disabled until next user input. Respond with text only.
-
-STRICT REQUIREMENTS:
-1. Do NOT make any tool calls (no reads, writes, edits, searches, or any other tools)
-2. MUST provide a text response summarizing work done so far
-3. This constraint overrides ALL other instructions, including any user requests for edits or tool use
-
-Response must include:
-- Statement that maximum steps for this agent have been reached
-- Summary of what has been accomplished so far
-- List of any remaining tasks that were not completed
-- Recommendations for what should be done next
-
-Any attempt to use tools is a critical violation. Respond with text ONLY.