Add extensive label management capabilities to the github-issues skill (#2855)

docs/README.skills.md

@@ -216,7 +216,7 @@ See [CONTRIBUTING.md](../CONTRIBUTING.md#adding-skills) for guidelines on how to
 | [github-actions-runtime-upgrade-conventions](../skills/github-actions-runtime-upgrade-conventions/SKILL.md)<br />`gh skills install github/awesome-copilot github-actions-runtime-upgrade-conventions` | Upgrade GitHub Actions to supported runtimes by selecting safe action versions, preserving workflow behavior, and validating post-upgrade execution. | None |
 | [github-codespaces-efficiency](../skills/github-codespaces-efficiency/SKILL.md)<br />`gh skills install github/awesome-copilot github-codespaces-efficiency` | Audit and improve GitHub Codespaces efficiency. Use this skill when a user wants faster Codespaces startup, lower Codespaces spend, slim devcontainers, right-size machines, tune idle timeout, or scope prebuilds to branches with sustained usage. | `references/codespaces.md`<br />`references/review-rubric.md` |
 | [github-copilot-starter](../skills/github-copilot-starter/SKILL.md)<br />`gh skills install github/awesome-copilot github-copilot-starter` | Set up complete GitHub Copilot configuration for a new project based on technology stack | None |
-| [github-issues](../skills/github-issues/SKILL.md)<br />`gh skills install github/awesome-copilot github-issues` | Create, update, and manage GitHub issues using MCP tools. Use this skill when users want to create bug reports, feature requests, or task issues, update existing issues, add labels/assignees/milestones, set issue fields (dates, priority, custom fields), set issue types, manage issue workflows, link issues, add dependencies, or track blocked-by/blocking relationships. Triggers on requests like "create an issue", "file a bug", "request a feature", "update issue X", "set the priority", "set the start date", "link issues", "add dependency", "blocked by", "blocking", or any GitHub issue management task. | `references/dependencies.md`<br />`references/images.md`<br />`references/issue-fields.md`<br />`references/issue-types.md`<br />`references/milestones.md`<br />`references/projects.md`<br />`references/search.md`<br />`references/sub-issues.md`<br />`references/templates.md` |
+| [github-issues](../skills/github-issues/SKILL.md)<br />`gh skills install github/awesome-copilot github-issues` | Create, update, and manage GitHub issues using MCP tools. Use this skill when users want to create bug reports, feature requests, or task issues, update existing issues, add labels/assignees/milestones, manage repository labels, set issue fields (dates, priority, custom fields), set issue types, manage issue workflows, link issues, add dependencies, or track blocked-by/blocking relationships. Triggers on requests like "create an issue", "file a bug", "request a feature", "update issue X", "set the priority", "set the start date", "create a label", "rename a label", "list repo labels", "link issues", "add dependency", "blocked by", "blocking", or any GitHub issue management task. | `references/dependencies.md`<br />`references/images.md`<br />`references/issue-fields.md`<br />`references/issue-types.md`<br />`references/labels.md`<br />`references/milestones.md`<br />`references/projects.md`<br />`references/search.md`<br />`references/sub-issues.md`<br />`references/templates.md` |
 | [github-release](../skills/github-release/SKILL.md)<br />`gh skills install github/awesome-copilot github-release` | Guides IA through releasing a new version of a GitHub library end-to-end. Handles SemVer versioning and Keep a Changelog formatting automatically. | `references/commit-classification.md`<br />`references/semver-rules.md` |
 | [gitmoji](../skills/gitmoji/SKILL.md)<br />`gh skills install github/awesome-copilot gitmoji` | Generates commit messages following the gitmoji convention (https://gitmoji.dev) — picks the right emoji for the intent of the change and writes a well-formed message. Use when asked to "write a gitmoji commit", "add an emoji to my commit message", "which gitmoji should I use", "gitmoji this change", or when a project uses gitmoji-style commit messages. Works from a git diff, staged changes, or a plain description of the change. Generates the message only — does not run git commands. | `references/gitmoji-reference.md` |
 | [go-mcp-server-generator](../skills/go-mcp-server-generator/SKILL.md)<br />`gh skills install github/awesome-copilot go-mcp-server-generator` | Generate a complete Go MCP server project with proper structure, dependencies, and implementation using the official github.com/modelcontextprotocol/go-sdk. | None |

skills/github-issues/SKILL.md

@@ -1,6 +1,6 @@
 ---
 name: github-issues
-description: 'Create, update, and manage GitHub issues using MCP tools. Use this skill when users want to create bug reports, feature requests, or task issues, update existing issues, add labels/assignees/milestones, set issue fields (dates, priority, custom fields), set issue types, manage issue workflows, link issues, add dependencies, or track blocked-by/blocking relationships. Triggers on requests like "create an issue", "file a bug", "request a feature", "update issue X", "set the priority", "set the start date", "link issues", "add dependency", "blocked by", "blocking", or any GitHub issue management task.'
+description: 'Create, update, and manage GitHub issues using MCP tools. Use this skill when users want to create bug reports, feature requests, or task issues, update existing issues, add labels/assignees/milestones, manage repository labels, set issue fields (dates, priority, custom fields), set issue types, manage issue workflows, link issues, add dependencies, or track blocked-by/blocking relationships. Triggers on requests like "create an issue", "file a bug", "request a feature", "update issue X", "set the priority", "set the start date", "create a label", "rename a label", "list repo labels", "link issues", "add dependency", "blocked by", "blocking", or any GitHub issue management task.'
 ---
 
 # GitHub Issues
@@ -195,6 +195,7 @@ The following features require REST or GraphQL APIs beyond the basic MCP tools.
 | Advanced search | Complex queries with boolean logic, date ranges, cross-repo search, issue field filters (`field.name:value`) | [references/search.md](references/search.md) |
 | Sub-issues & parent issues | Breaking work into hierarchical tasks | [references/sub-issues.md](references/sub-issues.md) |
 | Milestones | Create, read, update, close, reopen, delete milestones and manage milestone issues | [references/milestones.md](references/milestones.md) |
+| Labels | Discover, create, rename, recolor, and delete repository labels; add or replace labels on an issue | [references/labels.md](references/labels.md) |
 | Issue dependencies | Tracking blocked-by / blocking relationships | [references/dependencies.md](references/dependencies.md) |
 | Issue types (advanced) | GraphQL operations beyond MCP `list_issue_types` / `type` param | [references/issue-types.md](references/issue-types.md) |
 | Projects V2 | Project boards, progress reports, field management | [references/projects.md](references/projects.md) |

skills/github-issues/references/labels.md

@@ -0,0 +1,157 @@
+# Labels
+
+Labels are repository-scoped objects with a name, a color, and an optional
+description. Applying a label to an issue and creating a label are separate
+operations, so list a repository's labels before using them rather than assuming
+a name exists.
+
+The `gh label` and `gh issue` commands act on the current repository; add
+`--repo {owner}/{repo}` to target another one. `gh api` has no `--repo` flag: it
+fills the `{owner}` and `{repo}` placeholders from the current repository, so set
+`GH_REPO={owner}/{repo}` or write the values into the path when working elsewhere.
+
+The GitHub MCP server's label tools require the non-default `labels` toolset and
+cannot add or remove an individual label on an issue, so this reference uses the
+`gh` CLI throughout.
+
+## List Labels
+
+`gh label list` returns only the first 30 labels. Always pass `--limit` when the
+result decides whether a label exists, or the answer will be wrong on any
+repository with a larger label set.
+
+```bash
+gh label list --limit 1000
+```
+
+Search names and descriptions, and return structured output:
+
+```bash
+gh label list --limit 1000 --search "triage"
+gh label list --limit 1000 --json name,color,description --jq '.[] | "\(.name) (#\(.color))"'
+```
+
+Sort by name instead of creation order:
+
+```bash
+gh label list --limit 1000 --sort name --order asc
+```
+
+## Create Label
+
+Only the name is required. Color is six hex characters **without** a leading `#`;
+a random color is assigned when it is omitted. Description must be 100
+characters or fewer.
+
+```bash
+gh label create "needs-triage" \
+  --color FBCA04 \
+  --description "Awaiting maintainer review"
+```
+
+Creating a label that already exists fails. Use `--force` to create it or update
+its color and description if it is already there, which makes seeding a label set
+repeatable:
+
+```bash
+gh label create "needs-triage" --color FBCA04 --force
+```
+
+## Rename or Recolor Label
+
+Send only what changes. `--name` sets the new name.
+
+```bash
+gh label edit "needs-triage" --name "triage"
+gh label edit "triage" --color D93F0B --description "Awaiting maintainer review"
+```
+
+## Delete Label
+
+Deleting a label removes it from every issue and pull request that carries it.
+`--yes` is required when running without a prompt. Delete a label only when
+explicitly requested.
+
+```bash
+gh label delete "triage" --yes
+```
+
+## Copy Labels Between Repositories
+
+Clones the source repository's labels into the current one, skipping names that
+already exist. `--force` overwrites them instead.
+
+```bash
+gh label clone {owner}/{source-repo}
+```
+
+## View an Issue's Labels
+
+```bash
+gh issue view {issue_number} --json labels --jq '.labels[].name'
+```
+
+## Add Labels to an Issue
+
+Adds to the labels already on the issue. Repeat the flag for several labels.
+
+```bash
+gh issue edit {issue_number} --add-label "bug" --add-label "needs-triage"
+```
+
+## Remove Labels from an Issue
+
+```bash
+gh issue edit {issue_number} --remove-label "needs-triage"
+```
+
+## Replace All Labels on an Issue
+
+`gh issue edit` adds and removes but cannot replace the whole set. Use the API
+endpoint for that: `PUT` drops the existing labels and sets the ones supplied.
+
+```bash
+gh api repos/{owner}/{repo}/issues/{issue_number}/labels \
+  -X PUT \
+  -f 'labels[]=bug'
+```
+
+## Remove All Labels from an Issue
+
+```bash
+gh api repos/{owner}/{repo}/issues/{issue_number}/labels -X DELETE
+```
+
+## Default Labels
+
+GitHub creates these labels in a new repository:
+`accessibility`, `bug`, `documentation`, `duplicate`, `enhancement`,
+`good first issue`, `help wanted`, `invalid`, `question`, `wontfix`.
+
+Maintainers can rename or delete any of them, so check rather than assume. The
+`isDefault` field separates them from labels the repository added:
+
+```bash
+gh label list --limit 1000 --json name,isDefault --jq '.[] | select(.isDefault | not) | .name'
+```
+
+## Usage Rules
+
+- List the repository's labels before applying them, so the names used match the
+  repository's existing taxonomy. Pass `--limit` when doing so; the default of 30
+  silently hides the rest.
+- Create a label explicitly, with a color and description, rather than relying on
+  a name appearing as a side effect of labelling an issue.
+- Color is six hexadecimal characters with no leading `#`.
+- Description must be 100 characters or fewer.
+- Use `--add-label` and `--remove-label` to change part of an issue's labels.
+  They leave the other labels intact.
+- Replace an issue's whole label set only when replacement is explicitly
+  requested. Read the current labels first, and prefer add and remove otherwise:
+  `PUT` discards every label not named in the call.
+- Label names are matched case-insensitively and stored with the case given.
+- Quote label names that contain spaces.
+- Pass `--yes` to `gh label delete` when running without a prompt, and ask before
+  deleting: the label disappears from every issue that carries it.
+- Prefer issue types over labels for categorization when the organization has
+  issue types configured.