Ed Zynda 8b442d2cbc feat(extensions): add OnLLMUsage, SetState, enriched AgentEndEvent (#53) ...

Three additive primitives to the extension API:

- OnLLMUsage event: per-LLM-call token + cost deltas attributed to the
  specific model/provider used for each round-trip. Derived from the SDK
  StepFinishEvent in the extension bridge. Enables accurate budget
  enforcement between calls instead of only at turn boundaries.

- ctx.SetState / GetState / DeleteState / ListState: session-scoped,
  last-write-wins key-value store backed by a sidecar file
  (<session>.ext-state.json) outside the conversation tree. Reads are
  O(1), writes don't grow the JSONL, and the store is not duplicated on
  fork. State is preserved across hot-reloads.

- Enriched AgentEndEvent: ToolCallCount, ToolNames, LLMCallCount, token
  deltas (input/output/cache-read/cache-write), CostDelta, and
  DurationMs populated by a per-turn aggregator. Existing handlers
  reading only Response/StopReason are unaffected.

Includes unit tests for the state store, LLMUsage registration,
enriched AgentEndEvent, turn aggregator, llmUsageMeta, and sidecar path
derivation. Adds examples/extensions/usage-budget.go demoing all three
primitives together. Documents the additions in README, the docs site
(extensions overview, capabilities, examples), and the kit-extensions
and kit-sdk skill guides.

Fixes #53

2026-06-09 14:00:35 +03:00

..

extensions

feat(extensions): add OnLLMUsage, SetState, enriched AgentEndEvent (#53)

2026-06-09 14:00:35 +03:00

sdk

feat(kit): isolate viper config per Kit instance + add NewAgent (#42)

2026-06-02 14:41:35 +03:00