133 lines
6.1 KiB
Markdown
133 lines
6.1 KiB
Markdown
# LLM Runtime Internals
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`internal/framework/llm` implements Notarius's transport boundary for structured
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completion. It contains the Scriptorium adapter, concurrency scheduler,
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prompt/schema registries, selected-profile recording, and provider-error
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redaction.
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Provider-neutral ownership rules are defined in
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[Architecture](../policy/architecture.md#llm-boundary). Profile sources,
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credentials, and concurrency settings are defined in
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[Configuration](../config.md).
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## Structured Contract
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Modules and LLM-backed validators depend on
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`contracts.StructuredLLMClient.CompleteStructured`. A request identifies a
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prompt and optional profile/session, supplies named input materials and
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variables, and provides a caller-owned decoding target. A successful response
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contains the validated raw structured bytes plus non-secret provider, model,
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profile, and token metadata.
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The caller owns prompt selection, response-schema selection, and interpretation
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of the decoded result. `LLMInputMaterial` keeps source and reference bytes with
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their origin metadata so the adapter can pass named artifacts to Scriptorium
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without exposing Scriptorium types through stage contracts.
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## Production Construction
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`internal/cli` constructs the production runtime by:
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1. collecting embedded prompt and response-schema assets from production module
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packages;
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2. creating a `ScriptoriumClient` from the effective profile source;
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3. attaching an `LLMProfileRecorder`;
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4. creating a scheduler from the effective concurrency limit;
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5. returning a `ScheduledClient` wrapper.
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The CLI separately gathers explicit profile IDs from resolved LLM-capable stage
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and validator bindings. It prepares a small internal check prompt for each ID so
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missing or invalid profiles fail before pipeline execution. The runtime profile
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override syntax and scope are defined in the
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[CLI reference](../cli.md#run); binding rules are defined in
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[Configuration](../config.md#module-bindings).
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## Scriptorium Adapter
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`ScriptoriumClient` converts a Notarius request into a Scriptorium `RunRequest`.
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It validates the decoding target and prompt identity, maps named input materials
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to inline artifacts, forwards explicit profile and session context, delegates
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rendering/provider execution/structured validation, and unmarshals successful
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JSON into the caller target.
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Empty optional input material is represented by a single space so Scriptorium
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retains the named input. The client returns Scriptorium's validated structured
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bytes rather than re-encoding the caller target, allowing modules to preserve
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the runtime result exactly.
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Selected profile, provider, model, and token metadata are mapped into the
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Notarius response. The recorder deduplicates profiles by identity and supplies
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manifest-safe profile summaries after actual calls; manifest population does
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not guess the selected prompt default in advance.
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Generated-output validation failures and provider failures are wrapped with
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prompt context. Error strings pass through bearer-token redaction before they
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cross the runtime boundary.
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## Scheduling
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`Scheduler` uses a bounded permit count and a FIFO waiter queue. Immediate
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acquisition increments the in-flight count; queued acquisition waits for a
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permit or context cancellation. Cancellation removes a queued waiter, while a
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cancelled waiter that has already received a permit releases it.
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`ScheduledClient` acquires a permit around each structured completion and
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defers release on every result path. The effective limit and default are
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configuration facts in [Configuration](../config.md#defaults).
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## Prompt And Schema Assets
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`AssetRegistry` combines caller-owned prompt filesystems under stable prefixes
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and rejects invalid or conflicting registrations. Production module packages
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register their own prompt and schema assets; generic framework code contains no
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D&D prompt content.
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Schema helpers load embedded JSON Schema with identity and digest metadata,
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return defensive copies, and expose a diagnostics map that omits schema bytes.
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The small framework registry contains only generic test schemas; production
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schemas remain package-owned.
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## Debug And Redaction Boundaries
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The pipeline may wrap the client with a debug recorder that captures prepared
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prompt/response material for an explicitly enabled debug run. Default
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diagnostics and manifests receive identities, hashes, usage, and selected
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profile summaries rather than prompt, source, reference, schema, or response
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content.
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The Scriptorium error wrapper removes bearer credential values from surfaced
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provider errors; `RedactSecrets` and `ErrorWithSecretsRedacted` support known
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secret values elsewhere in the runtime. Config diagnostics use a separate
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clone-and-redact path in `internal/core/config`. These mechanisms implement the
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security invariant in
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[Architecture](../policy/architecture.md#state-output-and-safety); operator
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handling of debug data is defined in [Operations](../operations.md#debug).
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## Failure Behavior
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- Invalid targets, missing prompt IDs, malformed structured output, and
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Scriptorium failures return contextual errors to the calling module.
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- Scheduler construction rejects non-positive limits; acquisition respects
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context cancellation.
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- Asset registration rejects invalid roots, missing content, and path conflicts.
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- Schema loading distinguishes missing assets, invalid JSON, and invalid
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metadata.
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- Profile validation errors occur during CLI preparation when an explicit
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selected ID cannot be prepared.
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## Tests To Inspect
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- `internal/framework/llm/scriptorium_client_test.go` and
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`scriptorium_api_test.go`: adapter mapping and local HTTP integration.
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- `internal/framework/llm/scheduler_test.go` and
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`scheduled_client_test.go`: permits, FIFO behavior, cancellation, and wrapper
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release.
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- `internal/framework/llm/asset_registry_test.go` and
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`schema_registry_test.go`: asset composition, validation, and defensive
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copies.
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- `internal/framework/llm/secrets_test.go`: provider-error redaction.
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- `internal/cli/run_test.go`: profile validation, production client wiring,
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manifest recording, and debug integration.
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- Module-local `scriptorium_assets_test.go` files: prompt inputs and package
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asset registration.
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