diagnose

Read-only support bundle. Aggregates everything a maintainer needs to reproduce or pinpoint a nyann bug into one paste-friendly output.

When to trigger

• User reports nyann broke on their repo and wants to file a bug
• User asks for a "support bundle", "diagnostic dump", or wants to know what to include in an issue
• User says nyann is misbehaving and wants help collecting evidence

What gets bundled

bin/diagnose.sh collects, in one structured JSON object:

• `nyann_version` — from .claude-plugin/plugin.json
• `host` — uname -srm, bash version, jq/git/gh versions
• `repo` — bin/explain-state.sh --json output (stack, profile, branching, hooks, CLAUDE.md, recent commits)
• `health` — bin/doctor.sh --json output (drift report + health score)
• `git` — git config --list lines + git status --porcelain, with embedded URL credentials redacted via nyann::redact_url
• `hook_files` — first 8 KB of .git/hooks/pre-commit, .git/hooks/commit-msg, .husky/pre-commit, .husky/commit-msg, .pre-commit-config.yaml (each null when absent)
• `nyann_config` — ~/.claude/nyann/preferences.json + team_profile_sources[] with URLs redacted
• `prereqs` — bin/check-prereqs.sh --json

Every field flows through redaction. The bundle is safe to paste into a public GitHub issue.

Execution flow

Phase 1: Explain what diagnose collects

Tell the user: "I'll run bin/diagnose.sh against this repo. It collects state, drift, hooks, and configuration into one bundle. URL credentials and tokens are redacted before output."

Phase 2: Run the bundle

Run bin/diagnose.sh --target . --json (default mode is human-readable; --json for the paste-into-issue version).

If the user wants to share publicly, suggest:

• Pipe to a file: bin/diagnose.sh --target . --json > nyann-diagnose-$(date +%Y%m%d).json
• OR use the human-readable mode (bin/diagnose.sh --target .) for a quick eyeball summary

Phase 3: Surface the obvious problems

Before handing the bundle off, look at:

• health.summary.broken_links > 0 → user has broken internal links
• health.summary.missing > 0 → user has missing hygiene files
• repo.claude_md.bytes > 8192 → CLAUDE.md over the hard cap
• prereqs[].status of missing for any kind: hard → nyann lacks a required tool

Mention the obvious ones; the maintainer will look at the bundle for the rest.

Phase 4: Where to file

Direct the user to the right surface:

• Bug report: <https://github.com/thettwe/nyann/issues/new>; paste the JSON bundle into a <details> block
• Security issue: see SECURITY.md; do NOT open a public issue

Key constraints

• Read-only. Mirrors doctor's contract: never writes, never persists, never opens a network call beyond what doctor --json already does.
• Redaction is the contract. Any URL with embedded credentials passes through nyann::redact_url before emission. Tokens never reach stdout.
• Truncated hook content (8 KB cap) so a multi-MB hook script doesn't bloat the bundle.
• Per-tier degradation: if gh is missing, the bundle still emits with host.gh = "missing". If ~/.claude/nyann/preferences.json doesn't exist, nyann_config = null. If the target isn't a git repo, git, health, and repo are stub-empty but the bundle still emits.

When to hand off

• "Fix the issues" / "remediate" → retrofit skill (targeted fixes)

or doctor skill (audit first, then decide).

• "Just check health, not a full bundle" → doctor skill.
• "What does nyann see here?" → explain-state skill (lighter, no

health or hook contents).