---
name: model-selector
description: Safely change an agent's primary and fallback models by validating IDs against the live LLM proxy model list. Use for model switches, fallback chain updates, and model-availability troubleshooting.
---

# Model Selector

## Core Rules

1. Validate model IDs against `/v1/models` before proposing changes.
2. Keep at least 2 fallback models.
3. Do not remove a primary model without setting a replacement.
4. Use exact IDs from the model catalog; do not guess.
5. Prefer provider diversity in fallbacks.
6. Get explicit user approval before writing config.
7. Treat `/model` as temporary; it creates per-session overrides.
8. After backend default changes, clear session pins and reset active sessions.

## Workflow

### 1) Fetch Available Models

```bash
bash {baseDir}/scripts/list-models.sh
bash {baseDir}/scripts/list-models.sh --providers
```

### 2) Validate Candidate IDs

```bash
bash {baseDir}/scripts/validate-model.sh "nvidia_nim/moonshotai/kimi-k2.5"
```

### 3) Inspect Current Configuration

```bash
bash {baseDir}/scripts/show-current.sh
```

### 4) Apply Backend Model Changes

```bash
# Primary only
bash {baseDir}/scripts/update-model.sh --primary "nanogpt/moonshotai/kimi-k2.5"

# Fallbacks only
bash {baseDir}/scripts/update-model.sh --fallbacks "nvidia_nim/moonshotai/kimi-k2.5,chutes/zai-org/GLM-5-TEE"

# Primary + fallbacks
bash {baseDir}/scripts/update-model.sh \
  --primary "nanogpt/moonshotai/kimi-k2.5" \
  --fallbacks "nvidia_nim/moonshotai/kimi-k2.5,chutes/zai-org/GLM-5-TEE"
```

### 5) Required Rollout Sequence (Do Not Skip)

1. Clear per-session model pins so defaults can apply.
2. Restart gateway so in-memory runtime state reloads config.
3. In active channels/threads, run `/reset` (or `/new`) before testing.

Use pin cleanup helper:

```bash
# Clear all session model pins for an agent
bash {baseDir}/scripts/clear-session-model-pins.sh --agent home

# Clear only one channel session family
bash {baseDir}/scripts/clear-session-model-pins.sh --agent home --channel 1470162839284224184
```

## Model ID Format

- Catalog ID format: `<provider>/<model-path>`
- Config reference format: `llm-proxy/<catalog-id>`

Examples:
- `nanogpt/moonshotai/kimi-k2.5` -> `llm-proxy/nanogpt/moonshotai/kimi-k2.5`
- `nvidia_nim/moonshotai/kimi-k2.5` -> `llm-proxy/nvidia_nim/moonshotai/kimi-k2.5`

For `/model` inside a session, use catalog IDs (without `llm-proxy/`).

## Troubleshooting Quick Checks

1. Model missing: rerun `list-models.sh` and validate exact ID.
2. Old model still used: clear session pins + restart gateway + `/reset`.
3. Unexpected fallbacks: confirm fallback chain order in `show-current.sh`.