Your Task

Command: $ARGUMENTS

Based on the command:

1. check - Discover current models, scan all skills, report status
2. update - Update outdated models to current versions
3. update --dry-run - Show what would be updated without making changes

---

Skill Model Updater

You maintain model currency across all skill files, ensuring skills use the latest Claude models.

---

Step 1: Discover Current Models

Before checking or updating skills, you MUST first discover current model IDs.

Discovery Method

1. Search for current Anthropic models:

   WebSearch: "Anthropic Claude model IDs 2025" OR "Claude API models list current"
   

2. Fetch official documentation:

   WebFetch: https://docs.anthropic.com/en/docs/about-claude/models
   

3. Extract current model IDs for each tier:

   • Opus (most capable) - Look for

     claude-opus-*

     or

     claude-*-opus-*

   • Sonnet (balanced) - Look for

     claude-sonnet-*

     or

     claude-*-sonnet-*

   • Haiku (fast) - Look for

     claude-haiku-*

     or

     claude-*-haiku-*

4. Identify the latest version of each tier by date suffix (e.g.,

   20250514

   >

   20250114

   )

Expected Output Format

After discovery, report:

CURRENT CLAUDE MODELS (discovered)
==================================
Source: docs.anthropic.com/en/docs/about-claude/models
Date checked: [today's date]

Opus:   claude-opus-4-5-20251101
Sonnet: claude-sonnet-4-5-20250929
Haiku:  claude-haiku-4-5-20251001

Shorthand aliases (always valid, resolve to current):

• opus

  → current opus model

• sonnet

  → current sonnet model

• haiku

  → current haiku model

---

Workflow

Check Mode

/skill-model-updater check

1. Discover current models (Step 1 above) - WebSearch/WebFetch Anthropic docs
2. Glob for all

   skills/*/SKILL.md

   files
3. Extract

   model:

   field from YAML frontmatter
4. Compare against discovered current models
5. Check CLAUDE.md - Scan

   ${CLAUDE_PLUGIN_ROOT}/CLAUDE.md

   for

   Co-Authored-By: Claude

   lines and verify model name is current
6. Report status for each skill and CLAUDE.md

Output format:

SKILL MODEL AUDIT
=================

Current Models (discovered from docs.anthropic.com):
- Opus: claude-opus-4-5-20251101
- Sonnet: claude-sonnet-4-5-20250929
- Haiku: claude-haiku-4-5-20251001

Skill Status:
✓ lyric-writer: claude-opus-4-5-20251101 (current)
✓ researcher: claude-sonnet-4-5-20250929 (current)
⚠ album-art-director: claude-sonnet-4-20250114 (outdated → claude-sonnet-4-5-20250929)
✓ import-audio: claude-haiku-4-5-20251001 (current)

Summary: 19/20 skills current, 1 needs update

Update Mode

/skill-model-updater update

1. Discover current models (Step 1 above)
2. Run check to identify outdated skills
3. For each outdated skill:
   • Read the SKILL.md file
   • Update the

     model:

     field to discovered current version
   • Preserve the skill's tier (don't change opus to sonnet)
4. Update CLAUDE.md - If

   Co-Authored-By

   line in

   ${CLAUDE_PLUGIN_ROOT}/CLAUDE.md

   references an outdated model name, update it to current
5. Report changes made

Output format:

SKILL MODEL UPDATE
==================

Models discovered from docs.anthropic.com:
- Opus: claude-opus-4-5-20251101
- Sonnet: claude-sonnet-4-5-20250929
- Haiku: claude-haiku-4-5-20251001

Updated 1 skill:
- album-art-director: claude-sonnet-4-20250114 → claude-sonnet-4-5-20250929

All skills now current.

Dry Run Mode

/skill-model-updater update --dry-run

Same as update but only reports what would change without editing files.

---

Model Detection Logic

Identifying Outdated Models

A model is outdated if:

1. It's an older version of a current model family (e.g.,

   claude-sonnet-4-20250114

   vs

   claude-sonnet-4-5-20250929

   )
2. It's a deprecated model (e.g.,

   claude-3-opus-20240229

   )

Tier Detection (Auto)

Detect tier from the skill's existing

model:

field - no hardcoded tier list needed:

• If model contains

  opus

  → update to current opus
• If model contains

  sonnet

  → update to current sonnet
• If model contains

  haiku

  → update to current haiku
• If model is shorthand (

  opus

  ,

  sonnet

  ,

  haiku

  ) → leave as-is (always resolves to current)

This preserves deliberate tier assignments without maintaining a separate mapping.

---

When New Models Release

This skill discovers models automatically and detects tiers from existing assignments.

When Anthropic releases new models:

1. Run check -

   /skill-model-updater check

   will discover new models automatically
2. Review changes - Verify discovered models are correct
3. Run update -

   /skill-model-updater update

   to propagate changes

Note: Tier assignments are documented in

${CLAUDE_PLUGIN_ROOT}/reference/model-strategy.md

. This skill preserves existing tiers - it only updates version numbers.

---

Example: Full Update Cycle

User: "New Claude models released, update skills"

1. Run check (discovers models automatically):
   /skill-model-updater check

   Output:
   - Discovered from docs.anthropic.com: Opus 4.5, Sonnet 4, Haiku 3.5
   - 3 skills using outdated sonnet (20250114 → 20250514)
   - 1 skill using deprecated opus (claude-3-opus → claude-opus-4-5)

2. Run dry-run:
   /skill-model-updater update --dry-run

   Output shows proposed changes

3. Run update:
   /skill-model-updater update

   Output confirms 4 skills updated

4. Verify:
   /skill-model-updater check

   Output: All 21 skills current

---

Error Handling

Missing Model Field

If a SKILL.md has no

model:

field:

• Report as "⚠ [skill]: No model specified"
• Do not add one automatically (requires manual decision)

Unknown Model

If a SKILL.md has an unrecognized model:

• Report as "? [skill]: Unknown model '[model-id]'"
• Do not update (requires manual review)

Invalid YAML

If a SKILL.md has malformed frontmatter:

• Report as "✗ [skill]: Invalid YAML frontmatter"
• Do not attempt to update

---

Scope

This skill updates model references in:

1. All

   skills/*/SKILL.md

   files - The

   model:

   field in YAML frontmatter

2. CLAUDE.md

   - The

   Co-Authored-By: Claude [Model] <noreply@anthropic.com>

   line in the versioning section

Both locations must stay in sync with the latest Claude model names.

---

Remember

• Check before update - Always know what will change
• Tiers are auto-detected - Skill reads existing model field to determine tier (opus/sonnet/haiku)
• Shorthand is safe -

  opus

  ,

  sonnet

  ,

  haiku

  always resolve to current versions
• Tier rationale - See

  ${CLAUDE_PLUGIN_ROOT}/reference/model-strategy.md

  for why each skill uses its tier
• CLAUDE.md co-author line - Must reflect the current top-tier model name used for commits