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tessleng/sdlc-implementation

Implementation guidance for executing plans with test-driven development and systematic debugging.

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Overview
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name:
executing-plans
description:
Executes a written multi-step implementation plan end to end - loads the plan, reviews it critically for gaps, works through each task with its verification steps, and reports when everything is done. This is the execution stage inside the delivery-flow workflow, entered by requests like "implement this plan", "run the plan", "execute the plan", or "work through these tasks" once delivery-flow has produced a written plan. Do not activate directly for a standalone request that has not gone through delivery-flow first.

Executing Plans

Overview

Load plan, review critically, execute all tasks, report when complete.

Announce at start: "I'm using the executing-plans skill to implement this plan."

Note: Execution runs inline in this agent; use an independent reviewer for the review stage when the harness supports it.

The Process

Step 1: Load and Review Plan

  1. Verify that the current workspace is appropriate for the task; do not create or switch worktrees unless the user asks
  2. Read plan file
  3. Review critically - identify any questions or concerns about the plan
  4. If concerns: Raise them with your human partner before starting
  5. If no concerns: Create todos for the plan items and proceed

Step 2: Execute Tasks

For each task:

  1. Mark as in_progress
  2. Follow each step exactly (plan has bite-sized steps)
  3. Run the verification the plan names for that task (a build, test, or lint command, or a manual check) and confirm it passes before moving on
  4. Mark as completed

Step 3: Complete Development

After all tasks complete and verified:

  • Announce: "I'm using the finishing-a-development-branch skill to complete this work."
  • REQUIRED SUB-SKILL: Use finishing-a-development-branch only when the user authorized an integration action; otherwise return to delivery-flow for a PR-ready handoff
  • Follow that skill to verify tests, present options, execute choice

When to Stop and Ask for Help

STOP executing immediately when:

  • Hit a blocker (missing dependency, test fails, instruction unclear)
  • Plan has critical gaps preventing starting
  • You don't understand an instruction
  • Verification fails repeatedly

Ask for clarification rather than guessing.

When to Revisit Earlier Steps

Return to Review (Step 1) when:

  • Partner updates the plan based on your feedback
  • Fundamental approach needs rethinking

Don't force through blockers - stop and ask.

Remember

  • Reference skills when plan says to
  • Never start implementation on main/master branch without explicit user consent
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tessleng
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