Issue Fields Migration

Issue fields are org-level typed metadata (single select, text, number, date) that replace label-based workarounds with structured, searchable, cross-repo fields. Every organization gets Priority, Effort, Start date, and Target date preconfigured, with support for up to 25 custom fields.

This skill bulk-migrates existing metadata into issue fields from two sources:

• Repo labels: Convert labels like p0, p1, priority/high into structured issue field values (e.g. the Priority field). Supports migrating multiple labels at once and optionally removing them after migration.
• Project V2 fields: Copy field values (single select, text, number, date, iteration) from a GitHub Project into the equivalent org-level issue fields.

When to Use

• User added org-level issue fields that overlap with existing project fields
• User wants to copy values from project fields to issue fields before deleting the old project fields
• User asks about "migrating", "transferring", or "copying" project field data to issue fields
• User wants to convert repo labels (e.g., p0, p1, p2, p3) into issue field values (e.g., Priority field)
• User asks about replacing labels with issue fields or cleaning up labels after adopting issue fields

Prerequisites

• The target org must have issue fields enabled
• The issue fields must already exist at the org level
• For project field migration: issue fields must be added to the project
• For label migration: labels must exist on the target repo(s)
• The user must have write access to the repos (and project, if migrating project fields)
• gh CLI must be authenticated with appropriate scopes

Available Tools

MCP Tools (read operations)

Tool	Purpose
mcp__github__projects_list	List project fields (list_project_fields), list project items with values (list_project_items)
mcp__github__projects_get	Get details of a specific project field or item

CLI / REST API

Operation	Command
List org issue fields	gh api /orgs/{org}/issue-fields -H "X-GitHub-Api-Version: 2026-03-10"
Read issue field values	gh api /repos/{owner}/{repo}/issues/{number}/issue-field-values -H "X-GitHub-Api-Version: 2026-03-10"
Write issue field values	gh api /repositories/{repo_id}/issues/{number}/issue-field-values -X POST -H "X-GitHub-Api-Version: 2026-03-10" --input -
Get repository ID	gh api /repos/{owner}/{repo} --jq .id
List repo labels	gh label list -R {owner}/{repo} --limit 1000 --json name,color,description
List issues by label	gh issue list -R {owner}/{repo} --label "{name}" --state all --json number,title,labels --limit 1000
Remove label from issue	gh api /repos/{owner}/{repo}/issues/{number}/labels/{label_name} -X DELETE

See references/issue-fields-api.md, references/projects-api.md, and references/labels-api.md for full API details.

Workflow

Step 0: Migration Source

Ask the user what they are migrating:

1. "Are you migrating labels or project fields?"

   • Labels: proceed to the Label Migration Flow below.
   • Project fields: proceed to the Project Field Migration Flow below.

2. If the user says labels:

   • Ask: "Which org and repo(s) contain the labels?"
   • Ask: "Which labels do you want to migrate?" (they can name them or say "show me the labels first")

3. If the user says project fields:

   • Ask: "Can you share the link to your project or tell me the org name and project number?"
   • Ask: "Which field do you want to migrate?"

---

Label Migration Flow

Use this flow when the user wants to convert repo labels into issue field values. Labels can only map to single_select issue fields (each label name maps to one option value).

Phase L1: Input & Label Discovery

1. Ask the user for: org name and repo(s) to migrate.
2. Fetch labels from each repo:

gh label list -R {owner}/{repo} --limit 1000 --json name,color,description

3. Fetch org issue fields:

gh api /orgs/{org}/issue-fields \
  -H "X-GitHub-Api-Version: 2026-03-10" \
  --jq '.[] | {id, name, content_type, options: [.options[]?.name]}'

4. Filtering (for repos with many labels): if the repo has 50+ labels, group by common prefix (e.g., priority-*, team-*, type-*) or color. Let the user filter with "show labels matching priority" or "show blue labels" before mapping. Never dump 100+ labels at once.

5. Ask the user which labels map to which issue field and option. Support these patterns:

   • Single label to single field: e.g., label "bug" → Type field, "Bug" option
   • Multiple labels to one field (bulk): e.g., labels p0, p1, p2, p3 → Priority field with matching options
   • Multiple labels to multiple fields: e.g., p1 → Priority + frontend → Team. Handle as separate mapping groups.

6. Auto-suggest mappings: for each label, attempt to match issue field options using these patterns (in order):

   • Exact match (case-insensitive): label Bug → option Bug
   • Prefix-number ({prefix}-{n} → {P}{n}): label priority-1 → option P1
   • Strip separators (hyphens, underscores, spaces): label good_first_issue → option Good First Issue
   • Substring containment: label type: bug → option Bug

   Present all suggestions at once for the user to confirm, correct, or skip.

Example output:

Labels in github/my-repo (showing relevant ones):
  p0, p1, p2, p3, bug, enhancement, frontend, backend

Org issue fields (single_select):
  Priority: Critical, P0, P1, P2, P3
  Type: Bug, Feature, Task
  Team: Frontend, Backend, Design

Suggested mappings:
  Label "p0" → Priority "P0"
  Label "p1" → Priority "P1"
  Label "p2" → Priority "P2"
  Label "p3" → Priority "P3"
  Label "bug" → Type "Bug"
  Label "frontend" → Team "Frontend"
  Label "backend" → Team "Backend"
  Label "enhancement" → (no auto-match; skip or map manually)

Confirm, adjust, or add more mappings?

Phase L2: Conflict Detection

After finalizing the label-to-option mappings, check for conflicts. A conflict occurs when an issue has multiple labels that map to the same issue field (since single_select fields can hold only one value).

1. Group label mappings by target issue field.
2. For each field with multiple label sources, note the potential for conflicts.
3. Ask the user for a conflict resolution strategy:
   • First match: use the first matching label found (by order of label mapping list)
   • Skip: skip issues with conflicting labels and report them
   • Manual: present each conflict for the user to decide

Example:

Potential conflict: labels "p0" and "p1" both map to the Priority field.
If an issue has both labels, which value should win?

Options:
  1. First match (use "p0" since it appears first in the mapping)
  2. Skip conflicting issues
  3. I'll decide case by case

Phase L3: Pre-flight Checks & Data Scan

1. For each repo, verify write access and cache the repository_id:

gh api /repos/{owner}/{repo} --jq '{full_name, id, permissions: .permissions}'

2. For each label in the mapping, fetch matching issues:

gh issue list -R {owner}/{repo} --label "{label_name}" --state all \
  --json number,title,labels,type --limit 1000

Warning: --limit 1000 silently truncates results. If you expect a label may have more than 1000 issues, paginate manually or verify the total count first (e.g., gh issue list --label "X" --state all --json number | jq length).

PR filtering: gh issue list returns both issues and PRs. Include type in the --json output and filter for type == "Issue" if the user only wants issues migrated.

3. If all selected labels return 0 issues, stop and tell the user. Suggest: try different labels, check spelling, or try a different repository. Do not proceed with an empty migration.

4. For multi-repo migrations, repeat across all specified repos.

5. For each issue found:

   • Check if the issue already has a value for the target issue field (skip if set).
   • Detect multi-label conflicts (issue has two labels for the same field).
   • Apply the conflict resolution strategy chosen in Phase L2.
   • Classify: migrate, skip (already set), skip (conflict), or skip (no matching label).

Phase L4: Preview / Dry-Run

Present a summary before any writes.

Example preview:

Label Migration Preview

Source: labels in github/my-repo
Target fields: Priority, Type, Team

| Category                | Count |
|-------------------------|-------|
| Issues to migrate       |   156 |
| Already set (skip)      |    12 |
| Conflicting labels (skip)|    3 |
| Total issues with labels|   171 |

Label breakdown:
  "p1" → Priority "P1": 42 issues
  "p2" → Priority "P2": 67 issues
  "p3" → Priority "P3": 38 issues
  "bug" → Type "Bug": 9 issues

Sample changes (first 5):
  github/my-repo#101: Priority → "P1"
  github/my-repo#203: Priority → "P2", Type → "Bug"
  github/my-repo#44:  Priority → "P3"
  github/my-repo#310: Priority → "P1"
  github/my-repo#7:   Type → "Bug"

After migration, do you also want to remove the migrated labels from issues? (optional)

Estimated time: ~24s (156 API calls at 0.15s each)

Proceed?

Phase L5: Execution

1. For each issue to migrate, write the issue field value (same endpoint as project field migration):

echo '{"issue_field_values": [{"field_id": FIELD_ID, "value": "OPTION_NAME"}]}' | \
  gh api /repositories/{repo_id}/issues/{number}/issue-field-values \
    -X POST \
    -H "X-GitHub-Api-Version: 2026-03-10" \
    --input -

Replace FIELD_ID with the integer field ID (e.g., 1) and OPTION_NAME with the option name string.

2. If the user opted to remove labels, remove each migrated label after successful field write:

gh api /repos/{owner}/{repo}/issues/{number}/labels/{label_name} -X DELETE

URL-encode label names that contain spaces or special characters.

3. Pacing: 100ms delay between calls. Exponential backoff on HTTP 429 (1s, 2s, 4s, up to 30s).
4. Progress: report every 25 items (e.g., "Migrated 75/156 issues...").
5. Error handling: log failures but continue. Include label removal failures separately.
6. Final summary:

Label Migration Complete

| Result                | Count |
|-----------------------|-------|
| Fields set            |   153 |
| Labels removed        |   153 |
| Skipped               |    15 |
| Failed (field write)  |     2 |
| Failed (label remove) |     1 |

Failed items:
  github/my-repo#501: 403 Forbidden (insufficient permissions)
  github/my-repo#88:  422 Validation failed (field not available on repo)
  github/my-repo#120: label removal failed (404, label already removed)

---

Project Field Migration Flow

Use this flow when the user wants to copy values from a GitHub Project V2 field to the corresponding org-level issue field.

Follow these six phases in order. Always preview before executing.

Phase P1: Input & Discovery

1. Ask the user for: org name and project number (or project URL).
2. Fetch project fields:

# Use MCP tool
mcp__github__projects_list(owner: "{org}", project_number: {n}, method: "list_project_fields")

3. Fetch org issue fields:

gh api /orgs/{org}/issue-fields \
  -H "X-GitHub-Api-Version: 2026-03-10" \
  --jq '.[] | {id, name, content_type, options: [.options[]?.name]}'

4. Filter out proxy fields: after issue fields are enabled on a project, some project fields appear as "proxy" entries with empty options: [] for single-select types. These mirror the real issue fields and should be ignored. Only match against project fields that have actual option values.

5. Auto-match fields by name (case-insensitive) with compatible types:

Project Field Type	Issue Field Type	Compatible?
TEXT	text	Yes, direct copy
SINGLE_SELECT	single_select	Yes, option mapping needed
NUMBER	number	Yes, direct copy
DATE	date	Yes, direct copy
ITERATION	(none)	No equivalent; skip with warning

6. Present the proposed field mappings as a table. Let the user confirm, adjust, or skip fields.

Example output:

Found 3 potential field mappings:

| # | Project Field      | Type          | Issue Field        | Status     |
|---|-------------------|---------------|--------------------|------------|
| 1 | Priority (renamed) | SINGLE_SELECT | Priority           | Auto-match |
| 2 | Due Date           | DATE          | Due Date           | Auto-match |
| 3 | Sprint             | ITERATION     | (no equivalent)    | Skipped    |

Proceed with fields 1 and 2? You can also add manual mappings.

Phase P2: Option Mapping (single-select fields only)

For each matched single-select pair:

1. Compare option names between the project field and issue field (case-insensitive).
2. Auto-match options with identical names.
3. For any unmapped project field options, present all unmapped options in a single summary and ask the user to provide mappings for all of them at once. Do not prompt one-by-one; batch them into a single exchange.
4. Show the final option mapping table for confirmation.

Example output:

Option mapping for "Release - Target":

Auto-matched (case-insensitive):
  "GA" → "GA"
  "Private Preview" → "Private Preview"
  "Public Preview" → "