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packages/opencode/src/session/llm.ts defines stream(input) as a scoped stream: it acquires an AbortController, aborts it on scope release, and invokes run({ ...input, abort: ctrl.signal }).LLMEvent stream. A result with type === "native" returns result.stream directly; otherwise result.result.fullStream is converted from an async iterable, mapped through LLMAISDK.toLLMEvents(LLMAISDK.adapterState(), event), and flattened.e instanceof Error ? e : new Error(String(e)).packages/opencode/src/session/llm.ts re-exports hasToolCalls as LLMRequestPrep.hasToolCalls and exports the LLM namespace from ./llm.Auth.node, 2. Config.node, 3. Provider.node, 4. Plugin.node, 5. Permission.node, 6. EventV2Bridge.node, 7. llmClient, 8. RuntimeFlags.node.packages/opencode/src/session/tools.ts, flags.experimentalCodeMode bypasses dynamic MCP tool registration by returning the existing tools collection immediately.mcp.tools(), converted with McpCatalog.convertTool(entry.def, entry.client, entry.timeout), and skipped when the converted tool has no execute function.asSchema(item.inputSchema).jsonSchema, normalized to include properties: schema.properties ?? {}, transformed using ProviderTransform.schema(input.model, ...), and wrapped with jsonSchema(transformed)."tool.execute.before" with { tool: key, sessionID: ctx.sessionID, callID: opts.toolCallId } and mutable { args }; it then requests permission through ctx.ask({ permission: key, metadata: {}, patterns: ["*"], always: ["*"] }) before invoking the original MCP execute(args, opts)."Tool.execute" and attributes "tool.name", "tool.call_id", "session.id", and "message.id"; after execution it triggers "tool.execute.after" with the tool, session, call ID, arguments, and result."text" appends contentItem.text; 2. "image" creates a file attachment with mime: contentItem.mimeType and a data:${contentItem.mimeType};base64,${contentItem.data} URL; 3. "resource" appends resource.text and may convert resource.blob into an attachment."application/octet-stream" and size is computed with base64Size(resource.blob). Unsupported MIME types produce text [Binary MCP resource omitted: ${resource.uri} (${mime}, ${formatBytes(size)}) is not a supported attachment type]; blobs exceeding MAX_MCP_RESOURCE_BLOB_BYTES produce text [Binary MCP resource omitted: ${resource.uri} (${mime}, ${formatBytes(size)}) exceeds ${formatBytes(MAX_MCP_RESOURCE_BLOB_BYTES)}].mime, url: data:${mime};base64,${resource.blob}, and filename: resource.uri."\n\n" and passed to truncate.output(..., {}, input.agent). Result metadata merges result.metadata, truncated: truncated.truncated, and conditionally outputPath: truncated.outputPath.title: "", merged truncation metadata, output: truncated.content, original content: result.content, and attachments augmented with PartID.ascending(), sessionID: ctx.sessionID, and messageID: input.processor.message.id.opts.abortSignal?.aborted after a dynamic MCP tool returns, tools.ts explicitly calls input.processor.completeToolCall(opts.toolCallId, output) before returning the output.toRecord(value) returns the value only when isRecord(value), otherwise {}; parseListMcpResourcesArgs(value) returns optional server; parseReadMcpResourceArgs(value) requires both server and uri.optionalString(args, key) maps undefined, null, and "" to undefined, throws ${key} must be a string for non-string values, and otherwise returns the string. requiredString(args, key) returns a truthy optional string or throws ${key} is required.formatMcpResource(resource) and formatMcpResourceTemplate(template) remove the internal client property and expose it publicly as server.formatMcpResourceContent(server, uri, content) normalizes content.contents to an array, filters entries through isRecord, and initializes separate text and file-attachment accumulators.packages/opencode/src/session/session.ts, search located updateMessage at line 629, updatePart at line 635, getPart at line 645, touch at line 749, messages at line 828, updatePartDelta at line 877, and the Service.of(...) return at line 906.