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Fix orphaned tool calls by inserting synthetic empty results
When a user interrupts a tool call flow (sends a message without providing tool results), APIs like OpenAI Responses and Anthropic fail because: - OpenAI requires tool outputs for function calls - OpenAI requires reasoning items to have their following items - Anthropic requires non-empty content for error tool results Instead of filtering out orphaned tool calls (which breaks thinking signatures), we now insert synthetic empty tool results with isError: true and content 'No result provided'. This preserves the conversation structure and satisfies all API requirements.
This commit is contained in:
Mario Zechner
parent
95fcda5887
commit
fb1fdb6006
2 changed files with 133 additions and 106 deletions
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@ -1,4 +1,4 @@
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import type { Api, AssistantMessage, Message, Model, ToolCall } from "../types.js";
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import type { Api, AssistantMessage, Message, Model, ToolCall, ToolResultMessage } from "../types.js";
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/**
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* Normalize tool call ID for GitHub Copilot cross-API compatibility.
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@ -13,118 +13,131 @@ export function transformMessages<TApi extends Api>(messages: Message[], model:
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// Build a map of original tool call IDs to normalized IDs for github-copilot cross-API switches
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const toolCallIdMap = new Map<string, string>();
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return messages
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.map((msg) => {
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// User messages pass through unchanged
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if (msg.role === "user") {
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return msg;
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}
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// First pass: transform messages (thinking blocks, tool call ID normalization)
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const transformed = messages.map((msg) => {
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// User messages pass through unchanged
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if (msg.role === "user") {
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return msg;
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}
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// Handle toolResult messages - normalize toolCallId if we have a mapping
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if (msg.role === "toolResult") {
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const normalizedId = toolCallIdMap.get(msg.toolCallId);
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if (normalizedId && normalizedId !== msg.toolCallId) {
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return { ...msg, toolCallId: normalizedId };
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}
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return msg;
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}
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// Assistant messages need transformation check
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if (msg.role === "assistant") {
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const assistantMsg = msg as AssistantMessage;
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// If message is from the same provider and API, keep as is
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if (assistantMsg.provider === model.provider && assistantMsg.api === model.api) {
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return msg;
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}
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// Check if we need to normalize tool call IDs (github-copilot cross-API)
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const needsToolCallIdNormalization =
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assistantMsg.provider === "github-copilot" &&
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model.provider === "github-copilot" &&
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assistantMsg.api !== model.api;
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// Transform message from different provider/model
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const transformedContent = assistantMsg.content.map((block) => {
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if (block.type === "thinking") {
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// Convert thinking block to text block with <thinking> tags
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return {
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type: "text" as const,
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text: `<thinking>\n${block.thinking}\n</thinking>`,
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};
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}
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// Normalize tool call IDs for github-copilot cross-API switches
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if (block.type === "toolCall" && needsToolCallIdNormalization) {
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const toolCall = block as ToolCall;
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const normalizedId = normalizeCopilotToolCallId(toolCall.id);
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if (normalizedId !== toolCall.id) {
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toolCallIdMap.set(toolCall.id, normalizedId);
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return { ...toolCall, id: normalizedId };
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}
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}
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// All other blocks pass through unchanged
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return block;
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});
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// Return transformed assistant message
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return {
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...assistantMsg,
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content: transformedContent,
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};
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// Handle toolResult messages - normalize toolCallId if we have a mapping
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if (msg.role === "toolResult") {
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const normalizedId = toolCallIdMap.get(msg.toolCallId);
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if (normalizedId && normalizedId !== msg.toolCallId) {
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return { ...msg, toolCallId: normalizedId };
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}
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return msg;
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})
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.map((msg, index, allMessages) => {
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// Second pass: filter out tool calls without corresponding tool results
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if (msg.role !== "assistant") {
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return msg;
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}
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}
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// Assistant messages need transformation check
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if (msg.role === "assistant") {
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const assistantMsg = msg as AssistantMessage;
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const isLastMessage = index === allMessages.length - 1;
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// If this is the last message, keep all tool calls (ongoing turn)
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if (isLastMessage) {
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// If message is from the same provider and API, keep as is
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if (assistantMsg.provider === model.provider && assistantMsg.api === model.api) {
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return msg;
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}
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// Extract tool call IDs from this message
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const toolCallIds = assistantMsg.content
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.filter((block) => block.type === "toolCall")
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.map((block) => (block.type === "toolCall" ? block.id : ""));
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// Check if we need to normalize tool call IDs (github-copilot cross-API)
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const needsToolCallIdNormalization =
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assistantMsg.provider === "github-copilot" &&
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model.provider === "github-copilot" &&
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assistantMsg.api !== model.api;
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// If no tool calls, return as is
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if (toolCallIds.length === 0) {
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return msg;
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}
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// Scan forward through subsequent messages to find matching tool results
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const matchedToolCallIds = new Set<string>();
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for (let i = index + 1; i < allMessages.length; i++) {
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const nextMsg = allMessages[i];
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// Stop scanning when we hit another assistant message
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if (nextMsg.role === "assistant") {
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break;
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// Transform message from different provider/model
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const transformedContent = assistantMsg.content.map((block) => {
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if (block.type === "thinking") {
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// Convert thinking block to text block with <thinking> tags
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return {
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type: "text" as const,
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text: `<thinking>\n${block.thinking}\n</thinking>`,
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};
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}
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// Check tool result messages for matching IDs
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if (nextMsg.role === "toolResult") {
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matchedToolCallIds.add(nextMsg.toolCallId);
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// Normalize tool call IDs for github-copilot cross-API switches
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if (block.type === "toolCall" && needsToolCallIdNormalization) {
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const toolCall = block as ToolCall;
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const normalizedId = normalizeCopilotToolCallId(toolCall.id);
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if (normalizedId !== toolCall.id) {
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toolCallIdMap.set(toolCall.id, normalizedId);
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return { ...toolCall, id: normalizedId };
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}
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}
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}
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// Filter out tool calls that don't have corresponding results
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const filteredContent = assistantMsg.content.filter((block) => {
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if (block.type === "toolCall") {
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return matchedToolCallIds.has(block.id);
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}
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return true; // Keep all non-toolCall blocks
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// All other blocks pass through unchanged
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return block;
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});
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// Return transformed assistant message
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return {
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...assistantMsg,
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content: filteredContent,
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content: transformedContent,
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};
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});
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}
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return msg;
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});
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// Second pass: insert synthetic empty tool results for orphaned tool calls
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// This preserves thinking signatures and satisfies API requirements
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const result: Message[] = [];
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let pendingToolCalls: ToolCall[] = [];
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let existingToolResultIds = new Set<string>();
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for (let i = 0; i < transformed.length; i++) {
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const msg = transformed[i];
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if (msg.role === "assistant") {
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// If we have pending orphaned tool calls from a previous assistant, insert synthetic results now
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if (pendingToolCalls.length > 0) {
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for (const tc of pendingToolCalls) {
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if (!existingToolResultIds.has(tc.id)) {
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result.push({
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role: "toolResult",
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toolCallId: tc.id,
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toolName: tc.name,
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content: [{ type: "text", text: "No result provided" }],
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isError: true,
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timestamp: Date.now(),
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} as ToolResultMessage);
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}
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}
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pendingToolCalls = [];
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existingToolResultIds = new Set();
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}
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// Track tool calls from this assistant message
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const assistantMsg = msg as AssistantMessage;
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const toolCalls = assistantMsg.content.filter((b) => b.type === "toolCall") as ToolCall[];
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if (toolCalls.length > 0) {
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pendingToolCalls = toolCalls;
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existingToolResultIds = new Set();
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}
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result.push(msg);
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} else if (msg.role === "toolResult") {
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existingToolResultIds.add(msg.toolCallId);
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result.push(msg);
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} else if (msg.role === "user") {
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// User message interrupts tool flow - insert synthetic results for orphaned calls
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if (pendingToolCalls.length > 0) {
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for (const tc of pendingToolCalls) {
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if (!existingToolResultIds.has(tc.id)) {
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result.push({
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role: "toolResult",
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toolCallId: tc.id,
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toolName: tc.name,
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content: [{ type: "text", text: "No result provided" }],
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isError: true,
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timestamp: Date.now(),
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} as ToolResultMessage);
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}
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}
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pendingToolCalls = [];
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existingToolResultIds = new Set();
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}
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result.push(msg);
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} else {
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result.push(msg);
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}
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}
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return result;
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}
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