[aw] Workshop Explanatory Diagram Generator failed

### Workflow Failure

**Workflow:** [Workshop Explanatory Diagram Generator](https://github.com/githubnext/gh-aw-workshop/blob/main/.github/workflows/workshop-explanatory-diagrams.md)
**Branch:** main
**Run:** https://github.com/githubnext/gh-aw-workshop/actions/runs/34554904188

**Skill Installation Failed**: One or more frontmatter skills could not be installed before the agent ran. This typically happens when:

- The skill repository does not exist or is not accessible with the configured token
- The skill reference is invalid or points to a non-existent branch/tag/commit
- The `gh` CLI version is too old (requires a recent version that supports `gh skill install`)
- Network connectivity to the skill host is blocked by the firewall

**Failed skills:**
- `github/gh-aw-workshop/.github/skills/github-brand@56127b6381f0f1d976231bb924dadcbae18858de`: The process '/usr/bin/gh' failed with exit code 1

To resolve this, verify that:
1. The skill repository reference is correct (e.g. `owner/repo` or `owner/repo/skill/path@sha`)
2. The token configured for the skill has read access to the skill repository
3. The skill repository and branch/tag/commit exist on GitHub

See: https://github.com/github/gh-aw/blob/main/docs/src/content/docs/reference/skills.mdx

### Action Required

**Assign this issue to an agent** to debug and fix the issue.

Debug with any coding agent

Use this prompt with any coding agent (GitHub Copilot, Claude, Gemini, etc.):

````
Debug the agentic workflow failure using https://raw.githubusercontent.com/github/gh-aw/main/debug.md

The failed workflow run is at https://github.com/githubnext/gh-aw-workshop/actions/runs/34554904188
````

Manually invoke the agent

Debug this workflow failure using your favorite Agent CLI and the `agentic-workflows` prompt.

- Start your agent
- Load the `agentic-workflows` skill from `.github/skills/agentic-workflows/SKILL.md` or
- Type `debug the agentic workflow workshop-explanatory-diagrams failure in https://github.com/githubnext/gh-aw-workshop/actions/runs/34554904188`

> [!TIP]
>
> Stop reporting this workflow as a failure
>
> To stop a workflow from creating failure issues, set `report-failure-as-issue: false` in its frontmatter:
> ```yaml
> safe-outputs:
> report-failure-as-issue: false
> ```
>
>

> Generated from [Workshop Explanatory Diagram Generator](https://github.com/githubnext/gh-aw-workshop/actions/runs/34554904188) · copilot · 128.1 AIC · [◷](https://github.com/search?q=repo%3Agithubnext%2Fgh-aw-workshop+is%3Aissue+%22gh-aw-workflow-id%3A+workshop-explanatory-diagrams%22&type=issues)
> - [x] expires on Sep 18, 2026, 2:44 AM UTC

Start with .github/workflows/workshop-explanatory-diagrams.md and the failed run, then read the gh-aw debug.md and skills documentation linked in the issue. Check why github/gh-aw-workshop/.github/skills/github-brand@56127b6381f0f1d976231bb924dadcbae18858de cannot be installed. Done means the workflow can install the skill and complete successfully on main.

Written by the indexing model from the issue text.