Log runner environment at session start (#109)

* Add logEnvironment to Runner interface for session diagnostics

Runners now log environment-specific config at session start, making it
easy to verify which account or config directory is active. This helps
debug multi-account setups where the wrong credentials could be used.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Update bun.lock

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Bump version to 1.0.1

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: elkinjosetm

bun.lock

@@ -1,6 +1,6 @@
 {
   "name": "stonecut",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "description": "CLI that drives PRD-driven development with agentic coding CLIs",
   "license": "MIT",
   "repository": {

package.json

@@ -120,6 +120,7 @@ export async function runAfkLoop<T extends { number: number }>(
 	const { logger, git, runner, runnerName } = session;
 
 	logger.log(`Session started — runner: ${runnerName}, iterations: ${iterations}`);
+	runner.logEnvironment(logger);
 	logger.log("");
 	const results: IterationResult[] = [];
 	const sessionStart = performance.now();

src/runner.ts

@@ -6,14 +6,19 @@
  * human-readable messages.
  */
 
-import type { Runner, RunResult } from "../types.js";
+import type { LogWriter, Runner, RunResult } from "../types.js";
 
 const ERROR_MESSAGES: Record<string, string> = {
 	error_max_turns: "max turns exceeded",
 	error_max_budget_usd: "max budget exceeded",
 };
 
 export class ClaudeRunner implements Runner {
+	logEnvironment(logger: LogWriter): void {
+		const configDir = process.env.CLAUDE_CONFIG_DIR || "~/.claude (default)";
+		logger.log(`Claude config: ${configDir}`);
+	}
+
 	async run(prompt: string): Promise<RunResult> {
 		const start = performance.now();
 

src/runners/claude.ts

@@ -6,7 +6,7 @@
  * output on failure.
  */
 
-import type { Runner, RunResult } from "../types.js";
+import type { LogWriter, Runner, RunResult } from "../types.js";
 
 function extractError(stdout: string): string {
 	for (const raw of stdout.split("\n")) {
@@ -43,6 +43,10 @@ function extractError(stdout: string): string {
 }
 
 export class CodexRunner implements Runner {
+	logEnvironment(_logger: LogWriter): void {
+		// No environment-specific config to log for Codex.
+	}
+
 	async run(prompt: string): Promise<RunResult> {
 		const start = performance.now();
 

src/runners/codex.ts

@@ -23,6 +23,7 @@ export interface IterationResult {
 /** Protocol that all runner adapters must satisfy. */
 export interface Runner {
 	run(prompt: string): Promise<RunResult>;
+	logEnvironment(logger: LogWriter): void;
 }
 
 /** Snapshot of the working tree state before a runner session. */

src/types.ts

@@ -27,6 +27,8 @@ class FakeRunner implements Runner {
 		this._success = success;
 	}
 
+	logEnvironment(): void {}
+
 	async run(prompt: string): Promise<RunResult> {
 		this.calls.push(prompt);
 		return { success: this._success, exitCode: 0, durationSeconds: 0.1 };
@@ -293,6 +295,7 @@ describe("runAfkLoop", () => {
 	test("runner failure does not complete issue", async () => {
 		const source = new FakeSource([{ number: 1, title: "Task 1" }]);
 		const failRunner: Runner = {
+			logEnvironment() {},
 			async run() {
 				return {
 					success: false,
@@ -462,6 +465,7 @@ describe("runAfkLoop", () => {
 			{ number: 2, title: "Task 2" },
 		]);
 		const failRunner: Runner = {
+			logEnvironment() {},
 			async run() {
 				return {
 					success: false,
@@ -499,6 +503,7 @@ describe("runAfkLoop", () => {
 		]);
 		let callCount = 0;
 		const runner: Runner = {
+			logEnvironment() {},
 			async run() {
 				callCount++;
 				// First call fails (issue 1 attempt 1), rest succeed
@@ -535,6 +540,7 @@ describe("runAfkLoop", () => {
 			{ number: 2, title: "Task 2" },
 		]);
 		const failRunner: Runner = {
+			logEnvironment() {},
 			async run() {
 				return {
 					success: false,
@@ -593,6 +599,7 @@ describe("runAfkLoop", () => {
 		const source = new FakeSource([{ number: 1, title: "Task 1" }]);
 		let callCount = 0;
 		const runner: Runner = {
+			logEnvironment() {},
 			async run() {
 				callCount++;
 				return {