Why Claude Overcomplicates Tasks and How to Keep Scope Clear

Claude overcomplicates tasks when the scope is not clearly stated. A prompt that asks Claude to "improve this function" leaves room for rewriting the function, refactoring surrounding code, adding documentation, and raising related issues — all of which Claude may consider part of "improvement." If you wanted one small change, you needed to say so.

The fix is usually in the prompt: a narrow goal, a short list of what to leave unchanged, and a sentence describing what done looks like. Saving those constraints as a decision in fenbs means the next session starts with the same scope rather than expanding it again.

Why Claude tends toward thoroughness

Claude is trained to be helpful, which generally means providing a complete answer. Asked to improve a piece of code, it interprets completeness as covering everything it notices — errors, style, structure, edge cases, documentation. None of these are wrong on their own; they become a problem when you wanted one specific thing.

In longer sessions, scope can creep further. An early message that says "help me refactor this module" can color how Claude interprets later messages, even if those later messages are about something smaller. Claude is also more likely to expand scope in a new session if the task description from a previous session is vague.

Write a narrow, specific goal

The most effective fix is to describe the specific outcome you want in the first message. Compare these two prompts: "improve this function" versus "rename fetchUser to getUser and update the one call site in auth.ts. Do not change any other file." The second leaves almost no room for scope expansion.

Specific goals have four parts: what to change, where it is, how to change it, and what to leave alone. You do not need all four in every prompt, but the more open the task, the more constraints help. A renaming task needs at least the file list and a "do not change other files" instruction.

• Name the specific file, function, or section to change.
• Say what the change is, not just what quality to improve.
• List files or areas that should not be touched.
• Describe the completion state in one sentence: "done when the function is renamed and all its call sites compile."

Add explicit constraints

Constraints are the instructions that prevent Claude from doing something you did not ask for. The most useful ones are negative: "do not add comments," "do not refactor code outside this function," "do not change the public API," "do not run tests." State them plainly; Claude cannot infer that you wanted a small change from a large codebase.

For Claude Code specifically, include a constraint on which tools to use. "Do not run the build," "do not commit," and "do not modify files outside this directory" prevent automated actions you did not intend. These instructions also serve as a check: if Claude Code proposes an action you did not authorize, you have a clear line to point to.

For Claude in a writing or analysis task, constraints on format and length prevent a short request from producing a long document. "Respond in five bullet points" or "rewrite this paragraph, not the section" sets the boundary before Claude has to guess it.

State the completion criteria

Completion criteria tell Claude when to stop. Without them, Claude decides when it has done enough, which may not match your judgment. "Stop after the function is renamed" or "stop when you have listed the three most likely causes" gives Claude a clear finish line.

In Claude Code, completion criteria also prevent an agent from continuing a task loop beyond what you asked for. A task that says "fix the failing test in user.test.ts" with no completion criteria may lead Claude Code to run the full test suite, identify other failures, and start fixing those too. Add "stop after the single failing test passes; do not change other tests."

Keeping scope stable across sessions

The problem with scope creep in multi-session work is that each new session starts without knowing what the previous one agreed to. If one session decides "we will refactor only this file this week," the next session does not know that unless it is written down. Claude will interpret the task from the materials it can see.

Writing scope decisions down makes them persistent. A decision that says "for this project, refactoring stays within the module listed in the task; other modules require a separate task" applies to every future session that reads it. A decision that says "do not add tests to existing files without a separate task" prevents the pattern that caused the last expansion.

How to do this with fenbs

1. Create a free account, free for one person with no credit card, and add the project.
2. Write each scope constraint as a decision in Decisions and rules: what is in scope, what is out, and who decided it.
3. Add the specific completion criteria to the task's plan so they are visible before the session starts.
4. Connect Claude Code to fenbs through Integrations and ask it to read the project rules before starting any task.
5. After the session, update the task with what was actually done and flag any scope questions that came up, so the next session can pick up from a clear state.

fenbs does not constrain Claude Code's actions at a technical level — it does not block a file write or prevent a tool call. The constraint is an instruction that a well-running session should follow. For technical constraints such as blocking certain commands, use Claude Code's own permission settings.

For related reading, see how to stop a Claude Code task when a session has gone beyond scope, and Claude Code tasks vs. todos for how to structure the work before it starts.