Claude Code Best Practices for Engineering Teams

Give Claude a check it can run

A check is any signal the agent can read: a test suite, a build exit code, a screenshot comparison, a lint command, a generated file diff, or a script that validates output. Without that signal, Claude can only stop when the work appears done.

The check should be proportionate. A typo fix may only need a build. A parser change needs focused fixtures. A UI change needs visual inspection. A data migration needs dry-run output and rollback notes.

Primary-source anchor: Anthropic recommends giving Claude Code tests, builds, screenshots, or other checks that close the loop.

Separate exploration from implementation on complex work

For small edits, a direct instruction is fine. For multi-file or unfamiliar work, ask Claude to inspect the repo, summarize the relevant paths, and propose a plan before changing files. This prevents the common failure mode where the agent solves a plausible problem instead of the actual one.

Plan mode is especially useful for auth flows, billing logic, data mutation, generated code, build systems, and large UI surfaces. The plan should name files, tests, risks, and the exact stop condition.

• Explore the code and tests that already exist.
• Explain the intended change in repo-specific terms.
• Name the files likely to change.
• Name the checks to run.
• Then edit.

Manage context as a scarce engineering resource

Claude Code sessions accumulate conversation, file contents, command output, instructions, and loaded extension content. Long sessions can become noisy. Use concise CLAUDE.md files, clear task boundaries, and fresh sessions for unrelated work.

When an investigation would require reading many files, split it: use a subagent if the tooling allows it, or use a separate worktree/session. The goal is to keep the main conversation focused on decisions and implementation.

Primary-source anchor: Anthropic describes the context window as containing conversation history, file contents, command output, CLAUDE.md, memory, skills, and system instructions.

Choose the right extension for the job

Use CLAUDE.md for project facts that apply every session. Use skills for reusable procedures and domain knowledge that should load only when relevant. Use hooks for actions that must happen deterministically. Use MCP when Claude needs direct access to external systems. Use subagents when a task benefits from isolated context.

Do not turn every preference into every mechanism. If a rule is advisory, use instructions. If a rule must block the agent, use a hook. If a workflow is occasional, use a skill. If the data lives outside the repo, consider MCP.

Primary-source anchor: Anthropic's extension overview compares persistent context, skills, code intelligence, MCP, subagents, agent teams, hooks, and plugins by goal.

Keep the human in the merge path

Claude Code can create diffs, run checks, and prepare commits. The merge decision still belongs to a human or an explicit organizational gate. Make the final report mechanical: changed files, tests run, failures seen and fixed, residual risk, and out-of-scope items.

For higher-risk work, add an adversarial review step. That can be another Claude session, a human reviewer, or a CI job that tries to disprove the result. The point is to separate authoring from acceptance.