--- title: "@earendil-works/pi-agent-core (npm) | Since.dev" description: "What each @earendil-works/pi-agent-core release removed, renamed or changed: 1,234 breaking changes in 9 versions on npm, each with its source." canonical_url: https://since.dev/packages/npm/@earendil-works/pi-agent-core last_updated: 2026-10-01 --- # @earendil-works/pi-agent-core breaking changes Every breaking API change we have recorded in @earendil-works/pi-agent-core on npm: 1,234 breaking changes in 9 versions. Below are its newest 6 versions, removals and renames first, each with its source. Newest change October 1, 2026 ## 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](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/1.0.0) - **Removed** `AbortResult` AbortResult was removed in @earendil-works/pi-agent-core 1.0.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/1.0.0) - **Removed** `AcquireLaneOptions` AcquireLaneOptions was removed in @earendil-works/pi-agent-core 1.0.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/1.0.0) - **Removed** `AGENT_TELEMETRY_SCHEMAS` AGENT_TELEMETRY_SCHEMAS was removed in @earendil-works/pi-agent-core 1.0.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/1.0.0) - **Removed** `AgentHarness` AgentHarness was removed in @earendil-works/pi-agent-core 1.0.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/1.0.0) - **Removed** `AgentHarnessConstructor` AgentHarnessConstructor was removed in @earendil-works/pi-agent-core 1.0.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/1.0.0) - **Removed** `AgentHarnessOptions` AgentHarnessOptions was removed in @earendil-works/pi-agent-core 1.0.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/1.0.0) - **Removed** `AgentHarnessResources` AgentHarnessResources was removed in @earendil-works/pi-agent-core 1.0.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/1.0.0) - **Removed** `AgentHarnessStreamOptions` AgentHarnessStreamOptions was removed in @earendil-works/pi-agent-core 1.0.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/1.0.0) - **Removed** `AgentHarnessStreamOptionsPatch` AgentHarnessStreamOptionsPatch was removed in @earendil-works/pi-agent-core 1.0.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/1.0.0) 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](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.99.0) - **Removed** `ValueList.__@storedValueType@3992944` list().\_\_@storedValueType@3992944 was removed in @earendil-works/pi-agent-core 0.99.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.99.0) - **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:. [github.com](https://github.com/earendil-works/pi/releases/tag/v0.99.0) - **Signature changed** `experimental/pico3:JsonlStorage.rewindableLog` Was protected readonly rewindableLog: Map; now protected readonly rewindableLog: Map. [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.99.0) - **Signature changed** `experimental/pico3:kinds` Was const kinds: {readonly generation: import("./types.ts").CoreKind; now protected readonly rewindableLog: Map. [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.99.0) - **Signature changed** `experimental/pico3:toStored` Was const toStored: (value: T) => JsonRepresentation; now const toStored: (value: T) => Stored. [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.99.0) - **Signature changed** `operationToolArgsPrefix` Was const operationToolArgsPrefix: (operationId: string, stepId?: string | undefined) => Value>; now const operationToolArgsPrefix: (operationId: string, stepId?: string) => Value>. [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.99.0) - **Signature changed** `operationToolMemoPrefix` Was const operationToolMemoPrefix: (operationId: string, invocationId?: string | undefined) => Value; now const operationToolMemoPrefix: (operationId: string, invocationId?: string) => Value. [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.99.0) ## 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](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.87.0) - **Removed** `AgentOptions.shouldStopAfterTurn` AgentOptions.shouldStopAfterTurn was removed in @earendil-works/pi-agent-core 0.87.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.87.0) - **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](https://github.com/earendil-works/pi/releases/tag/v0.87.0) - **Removed** `ShouldStopAfterTurnContext` ShouldStopAfterTurnContext was removed in @earendil-works/pi-agent-core 0.87.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.87.0) - **Removed** `Value.__@storedValueType@4024151` value().\_\_@storedValueType@4024151 was removed in @earendil-works/pi-agent-core 0.87.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.87.0) - **Removed** `ValueList.__@storedValueType@4024151` list().\_\_@storedValueType@4024151 was removed in @earendil-works/pi-agent-core 0.87.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.87.0) - **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](https://github.com/earendil-works/pi/releases/tag/v0.87.0) - **Behavior changed** `context` Context handlers no longer receive system messages; Pi restores the prompt and tool state after they run. [github.com](https://github.com/earendil-works/pi/releases/tag/v0.87.0) - **Behavior changed** `ExtensionRunner.emit` Host integrations must dispatch turn_end boundaries with emitBoundary(baseEvent, buildContext) instead of emit. [github.com](https://github.com/earendil-works/pi/releases/tag/v0.87.0) - **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](https://github.com/earendil-works/pi/releases/tag/v0.87.0) 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](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.86.0) - **Removed** `AgentToolResult.addedToolNames` AgentToolResult.addedToolNames was removed in @earendil-works/pi-agent-core 0.86.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.86.0) - **Removed** `classifyForkAddress` classifyForkAddress was removed in @earendil-works/pi-agent-core 0.86.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.86.0) - **Removed** `ForkDisposition` ForkDisposition was removed in @earendil-works/pi-agent-core 0.86.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.86.0) - **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](https://github.com/earendil-works/pi/releases/tag/v0.86.0) - **Removed** `Value.__@storedValueType@4100102` value().\_\_@storedValueType@4100102 was removed in @earendil-works/pi-agent-core 0.86.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.86.0) - **Removed** `ValueList.__@storedValueType@4100102` list().\_\_@storedValueType@4100102 was removed in @earendil-works/pi-agent-core 0.86.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.86.0) - **Behavior changed** `--continue` Bash and PowerShell tool durations of at least one minute are now shown as minutes and seconds. [github.com](https://github.com/earendil-works/pi/releases/tag/v0.86.0) - **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](https://github.com/earendil-works/pi/releases/tag/v0.86.0) - **Behavior changed** `compat.allowedFallbackModels` Added configuration for overriding or disabling Anthropic server-side fallback models. [github.com](https://github.com/earendil-works/pi/releases/tag/v0.86.0) 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](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.85.0) - **Removed** `AbortRequestedRecord` AbortRequestedRecord was removed in @earendil-works/pi-agent-core 0.85.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.85.0) - **Removed** `ActionInfo` ActionInfo was removed in @earendil-works/pi-agent-core 0.85.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.85.0) - **Removed** `ActiveToolsEntry` ActiveToolsEntry was removed in @earendil-works/pi-agent-core 0.85.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.85.0) - **Removed** `AgentHarness.abort` AgentHarness.abort was removed in @earendil-works/pi-agent-core 0.85.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.85.0) - **Removed** `AgentHarness.cancelQueued` AgentHarness.cancelQueued was removed in @earendil-works/pi-agent-core 0.85.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.85.0) - **Removed** `AgentHarness.compact` AgentHarness.compact was removed in @earendil-works/pi-agent-core 0.85.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.85.0) - **Removed** `AgentHarness.create` AgentHarness.create was removed in @earendil-works/pi-agent-core 0.85.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.85.0) - **Removed** `AgentHarness.createLane` AgentHarness.createLane was removed in @earendil-works/pi-agent-core 0.85.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.85.0) - **Removed** `AgentHarness.followUp` AgentHarness.followUp was removed in @earendil-works/pi-agent-core 0.85.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.85.0) 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](https://github.com/earendil-works/pi/releases/tag/v0.84.0) - **Removed** The legacy JSONL and in-memory repository APIs are gone. Use JsonlSessionRepo or InMemorySessionRepo, which implement the new SessionRepo contract. [github.com](https://github.com/earendil-works/pi/releases/tag/v0.84.0) - **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](https://github.com/earendil-works/pi/releases/tag/v0.84.0) - **Removed** `AbortEvent` AbortEvent was removed in @earendil-works/pi-agent-core 0.84.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.84.0) - **Removed** `AbortResult.clearedFollowUp` AbortResult.clearedFollowUp was removed in @earendil-works/pi-agent-core 0.84.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.84.0) - **Removed** `AbortResult.clearedSteer` AbortResult.clearedSteer was removed in @earendil-works/pi-agent-core 0.84.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.84.0) - **Removed** `ActiveToolsChangeEntry` ActiveToolsChangeEntry was removed in @earendil-works/pi-agent-core 0.84.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.84.0) - **Removed** `AfterProviderResponseEvent` AfterProviderResponseEvent was removed in @earendil-works/pi-agent-core 0.84.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.84.0) - **Removed** `AgentHarness.appendMessage` AgentHarness.appendMessage was removed in @earendil-works/pi-agent-core 0.84.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.84.0) - **Removed** `AgentHarness.constructor` new AgentHarness() was removed in @earendil-works/pi-agent-core 0.84.0 [npmjs.com](https://www.npmjs.com/package/@earendil-works/pi-agent-core/v/0.84.0) 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](https://since.dev/scan.md), or have your coding agent call `check_code` with your manifest or lockfile over [MCP](https://since.dev/docs.md#mcp). [The API](https://since.dev/docs.md#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. ## Put your code on continuous maintenance. Scan a public repository now, or give your agent one line. [Scan a repository](https://since.dev/scan.md). Any public GitHub repository. No sign-in. ### Tell your agent what changed since it was trained. `claude mcp add --transport http since https://api.since.dev/mcp` [Get an API key](https://app.since.dev/login?mode=signup) Codex, Cursor and any MCP client use https://api.since.dev/mcp. --- Every page on this site as Markdown: https://since.dev/sitemap.md. For agents: https://since.dev/llms.txt.