add-llm-provider

name	add-llm-provider
description	Add a new LLM provider or model to the AI dispatch system. Use when adding a new model from an existing provider (e.g., a new Claude version) or wiring up a new OpenAI-compatible endpoint. Walks through the places that must change to keep pricing, quotas, and the admin model catalog in sync.

Add an LLM Provider or Model

The AI dispatch agent supports multiple LLM providers via the ILlmProvider adapter pattern. New OpenAI-compatible providers (DeepSeek, GLM, etc.) reuse OpenAiLlmProvider with a custom BaseUrl. New non-compatible providers need a new ILlmProvider implementation.

Decide the path

• New OpenAI-compatible provider (DeepSeek-style): no SDK code needed - just a new LlmProvider enum value and config. Skip step 3.
• New custom-SDK provider (e.g., Gemini, Mistral): create a new ILlmProvider implementation in step 3.
• New model from an existing provider (e.g., new Claude version): only steps 4–6 needed.

The dispatch model is global (admin-selected). There is no per-tenant model selection and no per-plan tier gating. The admin dropdown is populated automatically from LlmModelCatalog, so adding a model needs no UI change - just the catalog + pricing.

Files that must change (full provider)

1. src/Core/Logistics.Domain.Primitives/Enums/Llm/LlmProvider.cs - add enum value
2. src/Infrastructure/Logistics.Infrastructure.AI/Options/LlmOptions.cs - provider config section
3. src/Infrastructure/Logistics.Infrastructure.AI/Providers/{X}LlmProvider.cs - only for non-OpenAI-compatible
4. src/Infrastructure/Logistics.Infrastructure.AI/Providers/LlmProviderFactory.cs - resolution case
5. src/Infrastructure/Logistics.Infrastructure.AI/Services/LlmPricing.cs - pricing, multiplier, tier, billing units
6. src/Core/Logistics.Application.Abstractions/AiDispatch/LlmModelCatalog.cs - add the model { Id, DisplayName, Provider } (single source for the admin dropdown)

Step-by-step

1. Add enum value

public enum LlmProvider
{
    Anthropic,
    OpenAi,
    DeepSeek,
    NewProvider // ← here
}

2. Add provider config section

In LlmOptions.cs:

public record LlmProviderOptions
{
    public string ApiKey { get; set; } = "";
    public string Model { get; set; } = "";
    public string? BaseUrl { get; set; } // null for native SDKs
}

Then in appsettings.json:

{
  "Llm": {
    "Providers": {
      "NewProvider": {
        "ApiKey": "...",
        "Model": "new-model-1",
        "BaseUrl": "https://api.newprovider.com/v1"
      }
    }
  }
}

API key passed via env var: Llm__Providers__NewProvider__ApiKey.

3. (Custom SDK only) Create ILlmProvider implementation

If the provider is OpenAI-compatible (most modern providers are), skip this step - OpenAiLlmProvider handles it via BaseUrl.

If it requires a custom SDK, add Providers/NewLlmProvider.cs:

internal sealed class NewLlmProvider(IOptions<LlmProviderOptions> options) : ILlmProvider
{
    public async Task<LlmResponse> SendMessageAsync(LlmRequest request, CancellationToken ct)
    {
        // Translate LlmRequest → provider SDK request
        // Translate provider response → LlmResponse (LlmTypes only - no SDK types leak out)
    }
}

Provider-specific SDK types must not leak outside this class. The agent loop uses only LlmTypes (LlmRequest, LlmResponse, LlmToolUseBlock).

4. Resolve in LlmProviderFactory

public ILlmProvider GetProvider(LlmProvider provider) => provider switch
{
    LlmProvider.Anthropic => anthropic,
    LlmProvider.OpenAi => openai,
    LlmProvider.DeepSeek => deepseek,        // OpenAI-compatible reuse
    LlmProvider.NewProvider => newProvider,  // ← here
    _ => throw new NotSupportedException($"Unknown provider: {provider}")
};

For OpenAI-compatible providers, instantiate OpenAiLlmProvider with the right BaseUrl from options.

5. Update LlmPricing.cs

Three places in this file. Miss any one and quota/billing breaks silently.

private static readonly Dictionary<string, ModelPricing> Pricing = new()
{
    // existing entries
    ["new-model-1"] = new(0.50m, 2.0m, 0.05m), // input, output, cache-read per M tokens
};

public static int GetMultiplier(string model) => model switch
{
    "deepseek-..." or "claude-haiku-4-5" or "gpt-5.4-mini" or "new-model-1" => 1, // base = 1x
    "gpt-5.4" or "claude-sonnet-4-6" => 5, // premium = 5x
    "claude-opus-4-8" => 10, // ultra = 10x
    _ => 1
};

public static int GetOverageBillingUnits(string model) => model switch
{
    "gpt-5.4" or "claude-sonnet-4-6" => 2,
    "claude-opus-4-8" => 4,
    _ => 1 // ← matches GetMultiplier mapping
};

Decide the cost tier (1× / 5× / 10×), then keep billing units in step (1 / 2 / 4 at $0.20/unit). The tier only affects quota cost - it does not gate which plans can use the model (the model is global).

6. Add the model to LlmModelCatalog

In src/Core/Logistics.Application.Abstractions/AiDispatch/LlmModelCatalog.cs:

public static readonly IReadOnlyList<LlmModelInfo> Models =
[
    // existing entries
    new("new-model-1", "New Model 1", LlmProvider.NewProvider),
];

This is the single source for the admin AI Settings dropdown (GET /ai/settings) and for validating the selected model in UpdateAiSettingsCommand. The admin UI populates automatically - no frontend change.

Verification checklist

• Enum value added
• Config section + appsettings entry + env var documented
• (If custom SDK) Provider implementation, no SDK types leak
• Factory resolves the new provider
• All three LlmPricing switches/dictionaries updated (Pricing, GetMultiplier, GetOverageBillingUnits)
• LlmModelCatalog includes the model (id matches the LlmPricing keys)
• Admin AI Settings page shows the new model in the dropdown
• Selecting the model as the global model runs a dispatch session successfully

Common mistakes

• GetMultiplier and GetOverageBillingUnits out of sync: a Premium model with multiplier=5 but billing=1 underbills overages.
• LlmModelCatalog id ≠ LlmPricing key: the catalog offers a model the pricing map doesn't know, so it falls back to default pricing/multiplier.
• Forgetting BaseUrl for OpenAI-compatible providers - OpenAiLlmProvider defaults to OpenAI's endpoint and 401s.
• SDK types leaking: importing the provider SDK in any file other than Providers/{X}LlmProvider.cs breaks the abstraction.

Related

• .claude/rules/backend/ai-agent.md - multi-provider architecture overview
• docs/ai-dispatch.md - agent architecture