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Guides
CodingGet a second-opinion review from a fresh session or another model
Review the agent's diff in a session that didn't write it, either a fresh Claude Code session or Codex on the PR, and act only on findings that affect correctness.
ExcelTurn a recorded macro into reusable VBA with ChatGPT, then test it on a copy
Record the task, have ChatGPT clean up and comment the code and make the ranges dynamic, then compile, step through and test it on a copy before it touches real data.
ExcelRun a Python analysis in Excel with Copilot's Advanced Analysis
Put the data in a Table in a cloud-saved workbook, start Advanced Analysis in Copilot, let it write Python cells, and read each one before you reuse the code.
ExcelGet up to speed on an inherited workbook before you let AI change it
Work on a copy, inspect connections and named ranges, trace backwards from the outputs you need, and only then ask Copilot to describe what a sheet does.
ExcelDecode a long Excel formula with Evaluate Formula and an LLM
Paste the formula into ChatGPT or Claude for a plain-English explanation, then confirm each part with Evaluate Formula and F9 so you aren't relying on a wrong answer.
ExcelExtend an existing financial model with Claude in Excel without breaking it
Have Claude explain how the tabs connect and annotate complex formulas first, then extend the model following the original patterns while you check its assumptions.
CodingSet up Claude Code hooks for formatting, tests and protected files
Add PostToolUse hooks that format and test after edits, a PreToolUse hook that blocks protected files, and a notification for long runs.
CodingTurn a checklist you keep forgetting into a Claude Code skill
When you catch yourself re-typing the same multi-step instructions, put them in .claude/skills/<name>/SKILL.md and run them with a slash command.
CodingHand a well-scoped issue to GitHub Copilot's cloud agent and review its PR
Write the issue like a ticket for a junior engineer, assign it to Copilot, steer it with @copilot comments on the PR, and review it like any other contribution.
CodingDebug with an agent: reproduce, hypothesise, log, then fix
Don't just ask the agent to fix it. Make it reproduce the bug, state a testable hypothesis, prove the root cause with logging or a failing test, and only then change code.
CodingLet the agent check its own UI with Playwright MCP
Stop pasting screenshots. Add the Playwright MCP server so the agent can open your dev server, read the page structure and compare it with what you asked for.
CodingWrite Cursor project rules that actually load when you need them
Put rules in .cursor/rules as .mdc files, set alwaysApply, globs and the description on purpose, and test that the agent picks each rule up.
ExcelCombine monthly files with Power Query, using an LLM one step at a time
Point Power Query at a folder of same-shaped files, then use ChatGPT or Copilot only to write or explain individual M steps, testing each one before adding the next.
CodingRun parallel Claude Code agents in git worktrees without merge hell
Give each agent its own worktree, scope tasks so their files do not overlap, merge one stream at a time, and rebase the rest on the new main.
CodingMake a coding agent write the failing tests first, then implement
Split the work into separate prompts: tests only, confirm they fail for the right reason, commit, then implement without touching the tests.
ExcelClean a messy workbook: have Copilot flag issues, then decide yourself
Use Copilot as an auditor rather than an autopilot. Ask it to flag anything that needs manual review on its own sheet, then fix the data with Excel features you control.
ExcelAutomate a recurring Excel report: deterministic Python, AI only for the fuzzy parts
The pattern practitioners recommend on r/AI_Agents and r/automation: scripts for ingest, transform and validate, an OpenAI or Claude API call only for fields that need interpretation, and a hard stop when totals don't reconcile.
CodingPlan in Obsidian, build with Claude Code: the PRD-to-tasks loop
How practitioners on r/hermesagent run projects: requirements and task lists in an Obsidian vault, small tasks handed to a coding agent, every diff reviewed by a human.
CodingShip a feature with a coding agent: spec, tests first, then review the diff
The loop experienced developers describe on r/ExperiencedDevs: write the spec, plan the smallest steps, have tests written from the spec, implement, then review against the spec before anything merges.
CodingReview AI-written pull requests against an acceptance contract
A reviewer's method from r/ExperiencedDevs: a short scope contract at the top of the PR, the diff checked against it first, no extra behavior, plus Copilot code review as a first pass.
CodingKeep agent PRs small: one concern per branch
A developer's setup from r/ExperiencedDevs: the agent plans a feature into small chunks, writes the approved plan to the repo, and ships one stacked PR per concern.
ExcelWrite complex Excel formulas with Copilot, then prove they work
How r/excel users actually use Copilot for formulas: describe each field, take the draft as a starting point, test it on awkward rows, and check every reference before filling down.
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