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Date: Sep 8, 2026
/home/byk/Code/opencode-v2-pilot/packages/core/src/session/model-request.ts defines declineDefect(cause) to scan cause.reasons for died defects that are Permission.DeclinedError or QuestionTool.CancelledError; it returns the first decline via Result.succeed(decline), otherwise preserves the original cause via Result.fail(cause). The defect tunnel resurfaces declines as typed failures exactly once at the SessionModelRequest.executeTool runner seam.Prepared in /home/byk/Code/opencode-v2-pilot/packages/core/src/session/model-request.ts contains request: LLMRequest, options: StreamOptions, retry(event), and request-scoped executeTool(input): Effect.Effect<Tool.NormalizedResult, ExecuteError>; unknown and hook-removed calls fail individually through this same seam.PrepareInput identifies requests with kind: SessionRequestKind; scope includes session, agentID, optional contextAgentID, resolved model, and optional tools; transcript includes system and messages; optional controls are toolChoice, contextHooks?: false, and webSocket?: "session".baseTranscript() in /home/byk/Code/opencode-v2-pilot/packages/core/src/session/model-request.ts selects providerMetadataKey from input.model.model.route.providerMetadataKey ?? input.model.model.provider, uses input.agent.system or SessionSystemPrompt.make(...), filters empty system parts, and converts messages through toLLMMessages(input.messages, input.model.ref, providerMetadataKey)./home/byk/Code/opencode-v2-pilot/packages/core/src/session/model-request.ts are IMAGE_BYTES_TRIGGER = 25 * 1024 * 1024 (25 MiB) and IMAGE_BYTES_TARGET = 15 * 1024 * 1024 (15 MiB). Removed images are replaced with text saying the image is no longer visible, claims must not be made from memory, and it should be retrieved again or reattached if needed./home/byk/Code/opencode-v2-pilot/packages/plugin/src/effect/session.ts defines SessionRequestKind in order as "primary" | "compaction" | "title" | "generate"; SessionModelRequest, SessionHttpRequest, and SessionHttpResponse all carry readonly sessionID, agent, model, and kind./home/byk/Code/opencode-v2-pilot/packages/plugin/src/effect/session.ts are prompt, context, model.request, http.request, http.response, and retry. SessionRetryDecision is { retry: false } | { retry: true; delay: number }; SessionRetry exposes sessionID, agent, model, error, attempt, and mutable decision./home/byk/Code/opencode-v2-pilot/packages/plugin/src/effect/plugin.ts defines plugin Context domains: app, location, options, agent, aisdk, catalog, command, event, experimental.terminal.read, integration, mcp, generate, permission, plugin.list, reference, rpc, session, shell, skill, storage, tool, vcs, websearch, and worktree. Plugin<R = Scope.Scope> requires id and effect(context): Effect.Effect<void, never, R>, and define() returns the plugin unchanged.ToolFailure and must not use catchCause, because interruption and defects must survive.Permission.assert and question dismissals travel as defects beneath leaf mapError blankets, resurface as typed failures at SessionModelRequest.executeTool, and leaves must “never catch or convert them.”Permission.CorrectedError—a decline with feedback—remains typed so the leaf converts it into ToolFailure and the model continues.ToolEditor.add; the heterogeneous Core registry deliberately erases definitions to Tool.Info; internal storage should use any, not unknown, JSON-value plumbing, casts, or compiled wrappers merely to retain post-registration type safety. Runtime validation handles model input and declared output.Permission.Service dependency and performs no execution authorization; a registration’s permission action exists only for whole-tool definition filtering. Most tools default to their effective name, while edit, write, and patch share the edit action./home/byk/Code/opencode-v2-pilot/packages/core/src/tool.ts defines Snapshot with definitions, optional codeModeCatalog, and execute(input) receiving sessionID, agent, messageID, call, optional progress, and optional surviving request definitions; execution returns Effect.Effect<NormalizedResult, Tool.Error>.whollyDisabled(tool.options?.permission ?? name, rules), where the last wildcard-matching permission rule disables an action only when resource === "*" and effect === "deny". Direct tools have codemode === false; all others enter the CodeMode inventory. The synthetic execute tool and CodeMode catalog are omitted when action "execute" is wholly disabled./home/byk/Code/opencode-v2-pilot/packages/core/src/tool.ts always constructs Tool.Context from invocation sessionID, agent, messageID, Tool.CallID.make(input.call.id), and progress ?? (() => Effect.void), then runs execute.before. Hook-repaired names are resolved against surviving request definitions; removed tools fail with Tool.Error("Tool is not available for this request: ..."), and unresolved names fail with Tool.Error("Unknown tool: ...").executeTool() catches only Tool.Error into an "error" execute.after event, permits the hook to mutate the error, then fails with afterEvent.error. Successful execution emits a "completed" event containing output/content/metadata, then normalizes hook-modified content and images before returning the final NormalizedResult./home/byk/Code/opencode-v2-pilot/packages/core/src/tool.ts processes base64 data-URI image file content through image.normalize(...); Image.ResizerUnavailableError preserves the original image, Image.DecodeError omits it with a decode note, and Image.SizeError omits it with a size-limit note. Omission notes include the exact count and singular/plural wording./^[A-Za-z0-9_-]{1,64}$/; direct tool ID "execute" is reserved for CodeMode. Invalid registrations are collected and logged as Skipping invalid tool registration or Skipping invalid namespace registration; update() preserves the existing tool name, ID, and namespace./home/byk/Code/opencode-v2-pilot/packages/schema/src/permission.ts defines Permission.Source as a "tool" source containing messageID and id. Permission requests contain sessionID, action, resources, and optional save, metadata, source, and message; replies are "once", "always", or "reject"; effects are "allow", "deny", or "ask"./home/byk/Code/opencode-v2-pilot/packages/schema/src/permission.ts are ephemeral permission.asked and permission.replied; the reply event carries sessionID, requestID, and reply. A rule contains action, resource, and effect, and Ruleset is an array of rules./home/byk/.local/share/opencode/repos/github.com/Effect-TS/effect-smol/packages/effect/src/internal/effect.ts implements runPromiseExitWith(context) by forking with runForkWith(context) and resolving a Promise from the fiber observer. runPromiseWith(context) awaits that exit, throws causeSquash(exit.cause) for a failure, and returns exit.value for success; runPromise uses Context.empty().