SpacetimeDB/docs/DEVELOP.md

# DEVELOP.md

This document explains how to configure the environment, run the LLM benchmark tool, and work with the benchmark suite.

---

## Table of Contents

1. [Quick Checks & Fixes](#quick-checks-fixes)
2. [Environment Variables](#environment-variables)
3. [Benchmark Suite](#benchmark-suite)
4. [Context Construction](#context-construction)
5. [Troubleshooting](#troubleshooting)
---

## Quick Checks & Fixes

Use this single command to quickly unblock CI by regenerating hashes and running only GPT-5 for the minimal Rust + C# passes. This is not the full benchmark suite.

**Note: You will need OpenAI API keys to run this locally**. Alternatively, any SpacetimeDB member can comment `/update-llm-benchmark` on a PR to start a CI job to do this.

`cargo llm ci-quickfix`
What this does:
1. Runs Rust rustdoc_json pass for GPT-5 only.
2. Runs C# docs pass for GPT-5 only.
3. Writes updated results & summary.

---

> Model IDs passed to `--models` must match configured routes (see `model_routes.rs`), e.g. `"openai:gpt-5"`.


### Spacetime CLI
Publishing is performed via the `spacetime` CLI (`spacetime publish -c -y --server <name> <db>`). Ensure:
- `spacetime` is on PATH
- The target server is reachable/running

## Environment Variables

> These are the **defaults** and/or recommended dev values.

| Name | Purpose | Values / Example | Required |
|---|---|---|---|
| `SPACETIME_SERVER` | Target SpacetimeDB environment | `local` | ✅ |
| `LLM_DEBUG` | Print short debug info while generating | `true` / `false` (default `true` in dev) | ✅ |
| `LLM_DEBUG_VERBOSE` | Extra‑verbose logs (payloads, scoring detail) | `false` | ✅ |
| `LLM_BENCH_CONCURRENCY` | Parallel task concurrency across the whole bench run | `20` | ✅ |
| `LLM_BENCH_ROUTE_CONCURRENCY` | Per‑route concurrency (throttle per vendor/model) | `4` | ✅ |
| `OPENAI_API_KEY` | OpenAI credential | `sk-...` | optional* |
| `OPENAI_BASE_URL` | OpenAI-compatible base URL override | `https://api.openai.com/` | optional |
| `ANTHROPIC_API_KEY` | Anthropic credential | `...` | optional* |
| `ANTHROPIC_BASE_URL` | Anthropic base URL override | `https://api.anthropic.com` | optional |
| `GOOGLE_API_KEY` | Gemini credential | `...` | optional* |
| `GOOGLE_BASE_URL` | Gemini base URL override | `https://generativelanguage.googleapis.com` | optional |
| `XAI_API_KEY` | xAI Grok credential | `...` | optional |
| `DEEPSEEK_API_KEY` | DeepSeek credential | `...` | optional |
| `META_API_KEY` | Meta Llama credential  | `...` | optional* |

\*Required only if you plan to run that provider locally.

**Canonical dev block** (copy/paste into your shell profile):

```bash
OPENAI_API_KEY=
OPENAI_BASE_URL=https://api.openai.com/

ANTHROPIC_API_KEY=
ANTHROPIC_BASE_URL=https://api.anthropic.com

GOOGLE_API_KEY=
GOOGLE_BASE_URL=https://generativelanguage.googleapis.com

XAI_API_KEY=
XAI_BASE_URL=https://api.x.ai

DEEPSEEK_API_KEY=
DEEPSEEK_BASE_URL=https://api.deepseek.com

META_API_KEY=
META_BASE_URL=https://openrouter.ai/api/v1

SPACETIME_SERVER="local"
LLM_DEBUG=true
LLM_DEBUG_VERBOSE=false
LLM_BENCH_CONCURRENCY=20
LLM_BENCH_ROUTE_CONCURRENCY=4
```

Windows PowerShell:

```powershell
$env:SPACETIME_SERVER="local"
$env:LLM_DEBUG="true"
$env:LLM_DEBUG_VERBOSE="false"
$env:LLM_BENCH_CONCURRENCY="20"
$env:LLM_BENCH_ROUTE_CONCURRENCY="4"
```


### LLM Providers — Keys & Base URLs

> Notes
> - These match the providers wired in this repo (`OpenAiClient`, `AnthropicClient`, `GoogleGeminiClient`, `XaiGrokClient`, `DeepSeekClient`, `MetaLlamaClient`).

| Provider      | API Key Env         | Base URL Env (optional) | Default Base URL |
|---------------|---------------------|-------------------------|---|
| OpenAI        | `OPENAI_API_KEY`    | `OPENAI_BASE_URL`       | `https://api.openai.com` |
| Anthropic     | `ANTHROPIC_API_KEY` | `ANTHROPIC_BASE_URL`    | `https://api.anthropic.com` |
| Google Gemini | `GOOGLE_API_KEY`    | `GOOGLE_BASE_URL`       | `https://generativelanguage.googleapis.com` |
| xAI Grok      | `XAI_API_KEY`       | `XAI_BASE_URL`          | `https://api.x.ai` |
| DeepSeek      | `DEEPSEEK_API_KEY`  | `DEEPSEEK_BASE_URL`     | `https://api.deepseek.com` |
| META          | `META_API_KEY`      | `META_BASE_URL`         | `https://openrouter.ai/api/v1` |

---

## Benchmark Suite

Results directory: `docs/llms`

### Result Files

There are two sets of result files, each serving a different purpose:

| Files | Purpose | Updated By |
|-------|---------|------------|
| `docs-benchmark-details.json`<br>`docs-benchmark-summary.json` | Test documentation quality with a single reference model (GPT-5) | `cargo llm ci-quickfix` |
| `llm-comparison-details.json`<br>`llm-comparison-summary.json` | Compare all LLMs against the same documentation | `cargo llm run` |

- **docs-benchmark**: Used by CI to ensure documentation quality. Contains only GPT-5 results.
- **llm-comparison**: Used for manual benchmark runs to compare LLM performance. Contains results from all configured models.

> Results writes are lock-safe and atomic. The tool takes an exclusive lock and writes via a temp file, then renames it, so concurrent runs won't corrupt results.

Open `llm_benchmark_stats_viewer.html` in a browser to inspect merged results locally.
### Current Benchmarks

**basics**
000. empty-reducers — tests whether it can create basic reducers with various arguments
001. basic-tables — can it create tables with basic columns
002. scheduled-table — can it create a scheduled table and reducer
003. struct-in-table — can it put a struct in a table
004. insert — can it insert a row
005. update — can it update a row
006. delete — can it delete a row
007. crud — can it insert, update, and delete a row in the same reducer
008. index-lookup — can it look up something from an index
009. init — can it write the init reducer
010. connect — can it write the client_connected/client_disconnected reducers
011. helper-function — can it create a non-reducer helper function

**schema**
012. spacetime-product-type — can it define a new spacetime product type
013. spacetime-sum-type — can it define a new sum type
014. elementary-columns — can it create columns with basic types
015. product-type-columns — can it create columns with product types
016. sum-type-columns — can it create columns with sum types
017. scheduled — can it create scheduled columns
018. constraints — can it add primary keys, unique constraints, and indexes
019. many-to-many — can it create a many-to-many relationship
020. ecs — can it create a basic ecs
021. multi-column-index — can it create a multi-column index

Benchmarks live under `benchmarks/` with structure like:

```
benchmarks/
  category/
    t_001_foo/
      tasks/
        rust.txt
        csharp.txt
      answers/
        rust.rs
        csharp.cs
      spec.rs          # scoring config, reducer/schema checks, etc.
```

### Creating a new benchmark

1. **Copy existing benchmark**
- Duplicate any existing benchmark folder.
- Bump the numeric prefix to a new, unused ID: `t_123_my_task`.

2. **Rename for the new task**
- Rename the folder to your ID + short slug: `t_123_my_task`.

3. **Write the task prompt**
- Create/update `tasks/rust.txt` and/or `tasks/csharp.txt`.
- Be explicit (tables, reducers, helpers, constraints). Avoid ambiguity.

4. **Add golden answers**
- Implement the canonical solution in `answers/rust.rs` and/or `answers/csharp.cs`.

5. **Define scoring**
- Edit `spec.rs` to add scorers (e.g., schema/table/field checks, reducer/func exists).

6. **Quick validation**
- Build goldens only:  
  `cargo llm run --goldens-only --tasks t_123_my_task`

7. **Categorize**
- Ensure the folder sits under the right category path.


### Typical Commands

```bash
# Run everything with current env (providers/models from your .env)
cargo llm run

# Only Rust (or C#)
cargo llm run --lang rust
cargo llm run --lang csharp

# Only certain categories (use your actual category names)
cargo llm run --categories basics,schema

# Only certain tasks by number (globally numbered)
cargo llm run --tasks 0,7,12

# Limit providers/models explicitly
cargo llm run \
  --providers openai,anthropic \
  --models "openai:gpt-5 anthropic:claude-sonnet-4-5"

# Dry runs
cargo llm run --hash-only         # build context only (no provider calls)
cargo llm run --goldens-only      # build/check goldens only

# Be aggressive (skip some safety checks)
cargo llm run --force

# CI sanity check per language
cargo llm ci-check --lang rust
cargo llm ci-check --lang csharp

# Generate PR comment markdown (compares against master baseline)
cargo llm ci-comment
# With custom baseline ref
cargo llm ci-comment --baseline-ref origin/main
```

Outputs:
- Logs to stdout/stderr (respecting `LLM_DEBUG`/`LLM_DEBUG_VERBOSE`).
- JSON results in a per‑run folder (timestamped), merged into aggregate reports.

---

## Context Construction

The benchmark tool constructs a context (documentation) that is sent to the LLM along with each task prompt. The context varies by language and mode.

### Modes

| Mode | Language | Source | Description |
|------|----------|--------|-------------|
| `rustdoc_json` | Rust | `crates/bindings` | Generates rustdoc JSON and extracts documentation from the spacetimedb crate |
| `docs` | C# | `docs/docs/**/*.md` | Concatenates all markdown files from the documentation |

### Tab Filtering

When building context for a specific language, the tool filters `<Tabs>` components to only include content relevant to the target language. This reduces noise and helps the LLM focus on the correct syntax.

**Filtered tab groupIds:**

| groupId | Purpose | Tab Values |
|---------|---------|------------|
| `server-language` | Server module code examples | `rust`, `csharp`, `typescript` |
| `client-language` | Client SDK code examples | `rust`, `csharp`, `typescript`, `cpp`, `blueprint` |

**Filtering behavior:**
- For C# tests: Only `value="csharp"` tabs are kept
- For Rust tests: Only `value="rust"` tabs are kept
- If no matching tab exists (e.g., `client-language` with only `cpp`/`blueprint`), the entire tabs block is removed

**Example transformation:**

Before (in markdown):
```html
<Tabs groupId="server-language" queryString>
<TabItem value="csharp" label="C#">
C# code here
</TabItem>
<TabItem value="rust" label="Rust">
Rust code here
</TabItem>
</Tabs>
```

After (for C# context):
```
C# code here
```

### Documentation Best Practices

When writing documentation that will be used by the benchmark:

1. **Use consistent tab groupIds**: Always use `server-language` for server module code and `client-language` for client SDK code
2. **Include all supported languages**: Ensure each `<Tabs>` block has tabs for all languages you want to test
3. **Use consistent naming conventions**: The benchmark compares LLM output against golden answers, so documentation should reflect the expected conventions (e.g., PascalCase table names for C#)

---

## Troubleshooting

**HTTP 400/404 from providers**
- Check the model ID spelling and whether it’s available for your account/region.
- Verify the correct base URL for non-default gateways.

**Timeouts / Rate-limits**
- Lower `LLM_BENCH_CONCURRENCY` or `LLM_BENCH_ROUTE_CONCURRENCY`.
- Some providers aggressively throttle bursts; use backoff/retry when supported.