@earendil-works/pi-agent-core breaking changes

1.0.0

642 breaking changes, first published October 1, 2026.

• Removed AbortRequestResult
  AbortRequestResult was removed in @earendil-works/pi-agent-core 1.0.0 npmjs.com
• Removed AbortResult
  AbortResult was removed in @earendil-works/pi-agent-core 1.0.0 npmjs.com
• Removed AcquireLaneOptions
  AcquireLaneOptions was removed in @earendil-works/pi-agent-core 1.0.0 npmjs.com
• Removed AGENT_TELEMETRY_SCHEMAS
  AGENT_TELEMETRY_SCHEMAS was removed in @earendil-works/pi-agent-core 1.0.0 npmjs.com
• Removed AgentHarness
  AgentHarness was removed in @earendil-works/pi-agent-core 1.0.0 npmjs.com
• Removed AgentHarnessConstructor
  AgentHarnessConstructor was removed in @earendil-works/pi-agent-core 1.0.0 npmjs.com
• Removed AgentHarnessOptions
  AgentHarnessOptions was removed in @earendil-works/pi-agent-core 1.0.0 npmjs.com
• Removed AgentHarnessResources
  AgentHarnessResources was removed in @earendil-works/pi-agent-core 1.0.0 npmjs.com
• Removed AgentHarnessStreamOptions
  AgentHarnessStreamOptions was removed in @earendil-works/pi-agent-core 1.0.0 npmjs.com
• Removed AgentHarnessStreamOptionsPatch
  AgentHarnessStreamOptionsPatch was removed in @earendil-works/pi-agent-core 1.0.0 npmjs.com

And 632 more in this version.

0.99.0

9 breaking changes, first published September 29, 2026.

• Removed Value.__@storedValueType@3992944
  value().__@storedValueType@3992944 was removed in @earendil-works/pi-agent-core 0.99.0 npmjs.com
• Removed ValueList.__@storedValueType@3992944
  list().__@storedValueType@3992944 was removed in @earendil-works/pi-agent-core 0.99.0 npmjs.com
• Configuration changed --no-extensions
  Passing --no-extensions also turns off built-in extensions, including the llama.cpp provider. To load one, pass it explicitly with -e builtin:<name>. github.com
• Signature changed experimental/pico3:JsonlStorage.rewindableLog
  Was protected readonly rewindableLog: Map<number, {seq: number; ops: Op[];}[]>; now protected readonly rewindableLog: Map<number, {seq: Seq; ops: Op[];}[]>. npmjs.com
• Signature changed experimental/pico3:kinds
  Was const kinds: {readonly generation: import("./types.ts").CoreKind<import("./kinds/generation.ts").GenerationInput, import("./kinds/generation.ts").GenerationCheckpoint, import("./kinds/generation.ts").GenerationResult... npmjs.com
• Signature changed experimental/pico3:MemoryStorage.rewindableLog
  Was protected readonly rewindableLog: Map<number, {seq: number; ops: Op[];}[]>; now protected readonly rewindableLog: Map<number, {seq: Seq; ops: Op[];}[]>. npmjs.com
• Signature changed experimental/pico3:toStored
  Was const toStored: <T>(value: T) => JsonRepresentation<T>; now const toStored: <T>(value: T) => Stored<T>. npmjs.com
• Signature changed operationToolArgsPrefix
  Was const operationToolArgsPrefix: (operationId: string, stepId?: string | undefined) => Value<Record<string, JsonValue>>; now const operationToolArgsPrefix: (operationId: string, stepId?: string) => Value<Record<string, JsonValue>>. npmjs.com
• Signature changed operationToolMemoPrefix
  Was const operationToolMemoPrefix: (operationId: string, invocationId?: string | undefined) => Value<JsonValue>; now const operationToolMemoPrefix: (operationId: string, invocationId?: string) => Value<JsonValue>. npmjs.com

0.87.0

12 breaking changes, first published September 21, 2026.

• Removed Agent.shouldStopAfterTurn
  Agent.shouldStopAfterTurn was removed in @earendil-works/pi-agent-core 0.87.0 npmjs.com
• Removed AgentOptions.shouldStopAfterTurn
  AgentOptions.shouldStopAfterTurn was removed in @earendil-works/pi-agent-core 0.87.0 npmjs.com
• Removed shouldStopAfterTurn
  The inherited shouldStopAfterTurn agent option is removed. Use finishTurn and return { action: "end" } instead; return undefined for error and aborted responses. github.com
• Removed ShouldStopAfterTurnContext
  ShouldStopAfterTurnContext was removed in @earendil-works/pi-agent-core 0.87.0 npmjs.com
• Removed Value.__@storedValueType@4024151
  value().__@storedValueType@4024151 was removed in @earendil-works/pi-agent-core 0.87.0 npmjs.com
• Removed ValueList.__@storedValueType@4024151
  list().__@storedValueType@4024151 was removed in @earendil-works/pi-agent-core 0.87.0 npmjs.com
• Behavior changed agent_settled
  Runs requested from agent_settled handlers now start after all settled handlers finish, so no reentrant agent_start occurs during the same dispatch. github.com
• Behavior changed context
  Context handlers no longer receive system messages; Pi restores the prompt and tool state after they run. github.com
• Behavior changed ExtensionRunner.emit
  Host integrations must dispatch turn_end boundaries with emitBoundary(baseEvent, buildContext) instead of emit. github.com
• Behavior changed SessionManager
  Assigning session.agent.state.messages no longer replaces future request history. Restore with SessionManager.inMemory, navigate with session.navigateTree(), or append through session.sessionManager and call session.refreshContext(). github.com

And 2 more in this version.

0.86.0

20 breaking changes, first published September 19, 2026.

• Removed AgentContext.systemPrompt
  AgentContext.systemPrompt was removed in @earendil-works/pi-agent-core 0.86.0 npmjs.com
• Removed AgentToolResult.addedToolNames
  AgentToolResult.addedToolNames was removed in @earendil-works/pi-agent-core 0.86.0 npmjs.com
• Removed classifyForkAddress
  classifyForkAddress was removed in @earendil-works/pi-agent-core 0.86.0 npmjs.com
• Removed ForkDisposition
  ForkDisposition was removed in @earendil-works/pi-agent-core 0.86.0 npmjs.com
• Removed GLM 5.2 and Kimi K3 effort aliases
  Redundant reasoning effort aliases for GLM 5.2 and Kimi K3 on Fireworks were removed. github.com
• Removed Value.__@storedValueType@4100102
  value().__@storedValueType@4100102 was removed in @earendil-works/pi-agent-core 0.86.0 npmjs.com
• Removed ValueList.__@storedValueType@4100102
  list().__@storedValueType@4100102 was removed in @earendil-works/pi-agent-core 0.86.0 npmjs.com
• Behavior changed --continue
  Bash and PowerShell tool durations of at least one minute are now shown as minutes and seconds. github.com
• Behavior changed before_agent_start
  When before_agent_start returns systemPrompt or forceSystemPrompt on models with mid-conversation system messages, the prompt is now sent as the leading system prompt rather than appended as a section patch. github.com
• Behavior changed compat.allowedFallbackModels
  Added configuration for overriding or disabling Anthropic server-side fallback models. github.com

And 10 more in this version.

0.85.0

311 breaking changes, first published September 4, 2026.

• Removed AbortRejected
  AbortRejected was removed in @earendil-works/pi-agent-core 0.85.0 npmjs.com
• Removed AbortRequestedRecord
  AbortRequestedRecord was removed in @earendil-works/pi-agent-core 0.85.0 npmjs.com
• Removed ActionInfo
  ActionInfo was removed in @earendil-works/pi-agent-core 0.85.0 npmjs.com
• Removed ActiveToolsEntry
  ActiveToolsEntry was removed in @earendil-works/pi-agent-core 0.85.0 npmjs.com
• Removed AgentHarness.abort
  AgentHarness.abort was removed in @earendil-works/pi-agent-core 0.85.0 npmjs.com
• Removed AgentHarness.cancelQueued
  AgentHarness.cancelQueued was removed in @earendil-works/pi-agent-core 0.85.0 npmjs.com
• Removed AgentHarness.compact
  AgentHarness.compact was removed in @earendil-works/pi-agent-core 0.85.0 npmjs.com
• Removed AgentHarness.create
  AgentHarness.create was removed in @earendil-works/pi-agent-core 0.85.0 npmjs.com
• Removed AgentHarness.createLane
  AgentHarness.createLane was removed in @earendil-works/pi-agent-core 0.85.0 npmjs.com
• Removed AgentHarness.followUp
  AgentHarness.followUp was removed in @earendil-works/pi-agent-core 0.85.0 npmjs.com

And 301 more in this version.

0.84.0

199 breaking changes, first published August 6, 2026.

• Removed
  The v2 session and AgentHarness API moved from the experimental entrypoint to the default export, and the experimental subpaths were removed. Update imports to the default export. github.com
• Removed
  The legacy JSONL and in-memory repository APIs are gone. Use JsonlSessionRepo or InMemorySessionRepo, which implement the new SessionRepo contract. github.com
• Removed
  The inherited pi-agent-core harness session model is replaced by the v4 Session, SessionStorage, and SessionRepo APIs. Code using the old session model must move to the new APIs. github.com
• Removed AbortEvent
  AbortEvent was removed in @earendil-works/pi-agent-core 0.84.0 npmjs.com
• Removed AbortResult.clearedFollowUp
  AbortResult.clearedFollowUp was removed in @earendil-works/pi-agent-core 0.84.0 npmjs.com
• Removed AbortResult.clearedSteer
  AbortResult.clearedSteer was removed in @earendil-works/pi-agent-core 0.84.0 npmjs.com
• Removed ActiveToolsChangeEntry
  ActiveToolsChangeEntry was removed in @earendil-works/pi-agent-core 0.84.0 npmjs.com
• Removed AfterProviderResponseEvent
  AfterProviderResponseEvent was removed in @earendil-works/pi-agent-core 0.84.0 npmjs.com
• Removed AgentHarness.appendMessage
  AgentHarness.appendMessage was removed in @earendil-works/pi-agent-core 0.84.0 npmjs.com
• Removed AgentHarness.constructor
  new AgentHarness() was removed in @earendil-works/pi-agent-core 0.84.0 npmjs.com

And 189 more in this version.

Check your code

These are the changes. To see which of them reach your code, scan a public repository, or have your coding agent call check_code with your manifest or lockfile over MCP. The API reads every change in every version, not only the newest. A fix pull request opens for the changes that reach a connected repository. Nothing merges or deploys.