Update Requirements

Skill Info

Part of the spec-manager agent. This skill updates requirements and cascades changes through specs and plans.

Input

The user provides a change description as arguments: $ARGUMENTS

The change description is a natural language instruction describing what to add, remove, or modify in the requirements.

Examples:

• /update-requirements Third requirements should be removed
• /update-requirements Add new requirements. API docs should be updated.
• /update-requirements Change FR-2 acceptance criteria to include error handling
• /update-requirements Performance requirement should be <200ms instead of <500ms

If no arguments are provided, ask the user what changes they want to make.

Process

Step 1: Identify Target Spec Set

1. List all */requirements.md files in specs/ directory
2. If only one spec set exists, use it automatically
3. If multiple exist, ask the user which one to update
4. Read all three files for the selected slug:
   • specs/{slug}/requirements.md
   • specs/{slug}/specs.md
   • specs/{slug}/plans.md

Step 2: Analyze the Change Request

Parse the user's natural language instruction to determine:

1. Change type: Add / Remove / Modify
2. Target section: Which part of requirements is affected (functional, non-functional, constraints, goals, etc.)
3. Specific items: Which FR-X, NFR, or section to change
4. Scope of impact: How this change ripples through specs and plans

Present a brief summary of understood changes to confirm with the user before applying:

Understood changes:
  - [Add/Remove/Modify]: {description}
  - Affected sections: {list}
  - Impact: {brief impact assessment}

Proceed with these changes?

Step 3: Update Requirements

Apply changes to specs/{slug}/requirements.md:

• Adding: Insert new FR-X entries with proper numbering, or add to the relevant section
• Removing: Remove the specified requirement and renumber remaining ones
• Modifying: Update the specified content in place
• Update the metadata:
  • Add > Updated: {YYYY-MM-DD} (or update existing)
  • Keep Status as-is or change to "Updated" if it was "Final"

Step 4: Update Specs

Read current specs/{slug}/specs.md and apply cascading changes:

• If specs were already generated (status is not "Pending"):

  1. Identify which TS-X entries are affected by the requirement change
  2. For added requirements: generate new TS-X entries following the existing format
  3. For removed requirements: remove corresponding TS-X entries and related sections (data models, API endpoints, etc.)
  4. For modified requirements: update affected TS-X entries and downstream sections
  5. Re-check architecture, data models, API design, and error handling for consistency
  6. Add entry to Clarification Log:

  | N | Requirement update: {brief description} | Applied via /update-requirements | {date} |
  

  7. Update > Updated: {YYYY-MM-DD}

• If specs are still "Pending": Update status to note requirements have changed, no further action needed

Step 5: Update Plans

Read current specs/{slug}/plans.md and apply cascading changes:

• If plans were already generated (status is not "Pending"):

  1. Identify which implementation steps are affected
  2. For added requirements: add new implementation steps in the appropriate order
  3. For removed requirements: remove corresponding steps, update step numbering, and clean up dependency references
  4. For modified requirements: update affected steps
  5. Update:
     • Implementation Steps (add/remove/modify)
     • Task Breakdown checklist
     • File Change Summary table
     • Dependencies Between Steps
     • Testing Strategy (if test coverage changes)
     • Progress Tracking table (preserve status of unaffected completed steps)
     • Acceptance Criteria Checklist
  6. Update > Updated: {YYYY-MM-DD}

• If plans are still "Pending": Update status to note specs have changed, no further action needed

Step 6: Report Changes

Display a summary of all changes made:

Requirements updated for: "{Original Task Title}"

Changes applied:
  Requirements (specs/{slug}/requirements.md):
    - {change description}

  Specs (specs/{slug}/specs.md):
    - {change description, or "No changes needed (still pending)"}

  Plans (specs/{slug}/plans.md):
    - {change description, or "No changes needed (still pending)"}

Change impact:
  - {N} requirements affected
  - {X} specs updated
  - {Y} plan steps updated

Handling Edge Cases

Conflicting changes

If the requested change conflicts with existing requirements:

• Identify the conflict
• Present both sides to the user
• Ask which takes priority
• Apply the resolution

Completed implementation steps

If some plan steps are already marked as "Completed":

• Do NOT change completed steps unless the change directly invalidates them
• If a completed step is invalidated, warn the user explicitly:

  Warning: Step {N} was already completed but is affected by this change.
  The implementation may need to be revised. Please review.
  

• Add a note in the Progress Tracking table

Ambiguous instructions

If the change description is ambiguous:

• Ask the user for clarification before making any changes
• Never guess which requirement to modify

Important

• Always read all three files before making changes
• Confirm understood changes with the user before applying
• Preserve content that is not affected by the change
• Maintain proper numbering (FR-X, TS-X, Step N) after additions/removals
• Keep the Clarification Log updated in specs
• Never silently drop requirements or specs - always report what was removed
• Preserve completed step progress in plans unless explicitly invalidated