- Implemented in-house, zero-dependency utility modules in `pi-utils` covering DOM manipulation, markdown parsing, templating, browser automation helpers, and terminal buffers.
- Migrated packages across the repository to consume the new internal utilities and `omptype` schema validators instead of external dependencies.
- Removed multiple external runtime and development dependencies including Zod, Marked, LRU cache, Turndown, and Puppeteer browser packages.
- Added MockResponse metadata fields and invoked onResponse pre-stream with lowercased headers, status fallback, and requestId.
- Wrapped request onResponse in agent-loop, captured response headers, and forwarded them with baseUrl to finish/fail span handling.
- Added detectGatewayFromHeaders export and pi.gen_ai.gateway.* span attributes via header-based gateway detection.
- Extended telemetry event/span payloads with responseHeaders and validated detection-priority and onResponse forwarding in tests.
- Swapped deprecated telemetry keys for OpenAIAttr/PiGenAIAttr constants, including tool intent keys.
- Normalized provider names via mapProviderNameToOtel and emitted OTEL pi.gen_ai fields on chat/request/response spans.
- Revised usage and aggregate telemetry to include cache-token totals plus failed and skipped step counts in run summaries.
- Updated OTEL and run-summary tests to use z.object schemas and renamed GenAI/PiGenAI attribute assertions.
- Replaced custom MockAssistantStream helpers with createMockModel streams across agent tests.
- Removed manual queueMicrotask stream-event scripting in favor of scripted mock responses.
- Consolidated helper fixtures by deleting local aliases and reusing shared user-message/model helpers.
- Updated test assertions to use mock.calls and mock.model metadata for call and context validation.
- Added resolveAttributes, normalizeProvider, normalizeAgentName, onCostDelta, onTelemetryWarning, and contentSerializer hooks to AgentTelemetryConfig.
- Added "summary" capture mode emitting bounded dashboard-friendly span attributes without full payloads.
- Added recordManualChatTelemetry for instrumenting non-loop model calls.
- Introduced TelemetryAttributeContext as a base for TelemetryHookContext.
- Replaced `GenAIAttr` with an `export const enum` in telemetry while preserving all GenAI attribute constants.
- Updated the OTEL stream test fixture to emit an `error` event with an `error` payload instead of a `done` event.
- Added runSubprocess telemetry propagation tests for inheriting parent telemetry and handling missing parent telemetry.
- Added opt-in telemetry configuration to Agent and session APIs, including Agent#setTelemetry mutator.
- Implemented OpenTelemetry spans for invoke_agent, chat, execute_tool, and handoff paths with metadata and step tracking.
- Added a telemetry helper module, OpenTelemetry request/usage types, and dependency wiring with no-op behavior when tracer SDK is absent.
- Added OTEL end-to-end tests and fixed coding-agent OutputSink realignment and artifact-link newline output issues.
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