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90 lines
2.9 KiB
Text
90 lines
2.9 KiB
Text
---
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title: LLM configuration
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description: Configure ktx LLM providers, model roles, and prompt caching.
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---
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Configure text generation, structured extraction, and ingest or memory loops in
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the top-level `llm` block.
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## Backends
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Set `llm.provider.backend` to one of these values:
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- `anthropic`: Use the Anthropic API through `ANTHROPIC_API_KEY` or the
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configured `api_key` reference.
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- `vertex`: Use Vertex AI Anthropic models through Google Cloud credentials.
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- `gateway`: Use AI Gateway-compatible Anthropic model ids.
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- `claude-code`: Use your local Claude Code session through the Claude Agent
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SDK. **ktx** strips provider-routing environment variables from child processes.
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- `codex`: Use your local Codex authentication through the Codex SDK.
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## Claude Code
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Use aliases or full Claude model IDs in `llm.models`:
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```yaml
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llm:
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provider:
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backend: claude-code
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models:
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default: sonnet
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triage: haiku
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candidateExtraction: sonnet
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curator: sonnet
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reconcile: sonnet
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repair: sonnet
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```
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During setup, choose the backend interactively or pass the model in automation:
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```bash
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ktx setup --llm-backend claude-code --llm-model opus --no-input
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```
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For Claude Code, `sonnet`, `opus`, and `haiku` map to **ktx** defaults. Full Claude
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model IDs are also accepted.
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`claude-code` exposes only **ktx** MCP tools for the current agent loop. SDK init
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metadata may still list host slash commands, skills, and subagents; **ktx** does not
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grant execution access to them.
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## Codex backend
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Use `codex` when you want **ktx** to run LLM-backed workflows through your
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local Codex authentication instead of a direct provider API key.
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```yaml
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llm:
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provider:
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backend: codex
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models:
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default: gpt-5.3-codex
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```
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Configure it non-interactively:
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```bash
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ktx setup --llm-backend codex --llm-model gpt-5.3-codex --no-input
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```
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This is separate from Codex agent-client setup. `ktx setup --agents --target
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codex` installs instructions and MCP access for an end-user Codex session.
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`ktx setup --llm-backend codex` makes **ktx** itself execute ingest, scan
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enrichment, memory, and other LLM-backed work through Codex.
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During runtime loops, **ktx** starts a temporary loopback MCP server for the
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current run, exposes only the tools passed to that run, asks Codex to use a
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read-only sandbox, sets `approval_policy=never`, auto-approves only those
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run-scoped MCP tools, and disables Codex web search.
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Codex backend isolation is currently limited by the public Codex SDK and CLI
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surface. Codex may still load user Codex config and built-in command execution
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or read-only file capabilities. Use `llm.provider.backend: claude-code` when
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you need stricter Claude-Code-style runtime tool isolation, or remove host
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Codex MCP and tool config before running untrusted prompts through the `codex`
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backend.
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## Prompt caching
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`llm.promptCaching` has partial parity on `claude-code`. Status and doctor warn
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when the Claude Agent SDK backend ignores configured cache fields.
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