AI coding agents are powerful but not infallible. Claude Code might misunderstand your architecture. Codex might generate code that doesn’t compile. Aider might edit the wrong files. When that happens, you need a systematic approach to get back on track.

Here’s how to handle the common failure modes.

The agent produces code that doesn’t compile

This is the most common issue. The agent writes code that looks reasonable but has syntax errors, missing imports, or type mismatches.

Fix: Don’t describe the error in words. Screenshot the error and paste it directly into the agent.

In GridTerm, this takes two seconds:

Run the build or compile in a free terminal
See the error output
Screenshot the error
Paste into the agent’s terminal: “Fix this compilation error”

The agent sees the exact error message with line numbers and context. Much more effective than typing “there’s a type error on line 47.”

The agent modifies the wrong files

Sometimes the agent misunderstands which files to change, especially in projects with similar-sounding components or modules.

Fix: Be explicit about file paths in your prompt.

Instead of: “Update the user component” Try: “Update src/components/UserProfile.tsx — change the avatar upload to accept PNG and JPG only”

If the agent already made wrong changes, tell it: “Undo the changes to src/components/UserList.tsx — I only wanted changes in UserProfile.tsx”

The agent goes in the wrong direction

You asked for a simple fix, but the agent is rewriting the entire module. Or it’s using a library you don’t want. Or it’s implementing a pattern that doesn’t match your codebase.

Fix: Interrupt and redirect early. Don’t wait for it to finish.

In Claude Code, you can stop the current operation and give a new prompt: “Stop. Don’t rewrite the entire module. Just change the validateEmail function to use regex instead of the current string splitting approach.”

The earlier you catch a wrong direction, the less cleanup needed.

The agent doesn’t understand your architecture

The agent might not grasp how your project is structured — where things live, what patterns you use, how modules interact.

Fix: Give context before the task.

“Our project uses a repository pattern. Data access is in src/repositories/, business logic in src/services/, and API routes in src/routes/. The route handlers call services, services call repositories. Don’t put database queries in route handlers.”

You can save this kind of context in a GridTerm note and paste it into each new agent session at the start.

Using multiple agents to debug

The multi-agent workflow is especially useful for debugging:

Agent 1: “There’s a bug where user sessions expire after 5 minutes instead of 24 hours. Trace the session timeout logic and identify where the duration is set.”

Agent 2: “Write a test that creates a user session and verifies it’s still valid after 6 hours.”

Agent 3: “Check git log for recent changes to any session or auth-related files.”

Three agents investigating from different angles. One traces the code, one writes a regression test, one checks recent commits. You triangulate the root cause from their combined findings.

Common error patterns and fixes

”I can’t find that file”

The agent doesn’t know about a file. Solution: make sure you’re running the agent from the right directory. In GridTerm, check the terminal’s working directory and cd to the project root.

The agent loops on the same error

It tries a fix, the fix doesn’t work, it tries the same fix again. Solution: give it more context. “The last three attempts all had the same error. The issue is that X depends on Y, which hasn’t been updated yet. Fix Y first, then X.”

Changes break existing tests

The agent modified code without checking tests. Solution: keep a terminal running tests continuously. When you see failures, screenshot them and paste into the agent.

The agent uses outdated patterns

It generates code using an old API version or deprecated pattern. Solution: “We use React 18 with hooks, not class components. The project uses Zustand for state management, not Redux. Rewrite using our current patterns.”

Prevention is better than debugging

Before prompting an agent on a complex task:

Be specific. “Refactor X” is vague. “Change the auth middleware in src/middleware/auth.ts to verify JWT tokens using the jsonwebtoken library instead of session cookies” is specific.
Set boundaries. “Only modify files in src/auth/. Don’t touch the API routes.”
Reference existing patterns. “Follow the same pattern used in src/services/userService.ts for the new payment service.”
Keep a workspace. Save a GridTerm workspace with your debugging layout — agents, test runner, git — so you can jump into debugging mode instantly.

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