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// Schema reference: https://ampcode.com/manual/appendix#stream-json-output
import { config, getToolKind, getToolTitle, getToolLocations, getInlineToolDescription } from './config.js';
import { createLogger } from './logger.js';
const logProtocol = createLogger('acp:protocol');
/**
* State tracker for nested tool call handling
* Tracks mapping between Amp tool_use_id and child tool metadata
* Also tracks per-parent progress counters for consolidated display
*/
export class NestedToolTracker {
constructor() {
// Map: childToolUseId → { parentToolUseId, name, input, status, index }
this.childTools = new Map();
// Map: parentToolUseId → { total, completed, failed, children: [{id, name, input, status}] }
this.parentStats = new Map();
// How many completed/failed items to show before collapsing
this.maxVisibleCompleted = 3;
this.maxVisibleFailed = 5; // Show first 2 + last 3 when collapsed
}
registerChild(childId, parentId, name, input) {
// Initialize parent stats if needed
if (!this.parentStats.has(parentId)) {
this.parentStats.set(parentId, { total: 0, completed: 0, failed: 0, children: [] });
}
const stats = this.parentStats.get(parentId);
const index = stats.total;
stats.total++;
stats.children.push({ id: childId, name, input, status: 'running' });
this.childTools.set(childId, { parentToolUseId: parentId, name, input, status: 'running', index });
}
getChild(childId) {
return this.childTools.get(childId);
}
completeChild(childId, isError) {
const child = this.childTools.get(childId);
Eif (child) {
child.status = isError ? 'failed' : 'completed';
// Update parent stats
const stats = this.parentStats.get(child.parentToolUseId);
Eif (stats) {
if (isError) {
stats.failed++;
} else {
stats.completed++;
}
// Update child in children array
const childEntry = stats.children.find((c) => c.id === childId);
Eif (childEntry) {
childEntry.status = child.status;
}
}
}
return child;
}
getParentStats(parentId) {
return this.parentStats.get(parentId);
}
isChildTool(childId) {
return this.childTools.has(childId);
}
/**
* Get full content array for a parent tool (ACP replaces content on each update)
* Returns array of content objects ready for ACP tool_call_update
*/
getContentArray(parentId) {
const stats = this.parentStats.get(parentId);
Iif (!stats) return [];
const lines = [];
// Separate children by status for smart display
const running = [];
const failed = [];
const completed = [];
for (const child of stats.children) {
if (child.status === 'running') {
running.push(child);
} else if (child.status === 'failed') {
failed.push(child);
} else {
completed.push(child);
}
}
// Always show all running items (need visibility for active work)
for (const child of running) {
lines.push(`◐ ${getInlineToolDescription(child.name, child.input)}`);
}
// Collapse failed items if too many (show first N + last M)
if (failed.length > this.maxVisibleFailed) {
const firstCount = Math.min(2, this.maxVisibleFailed);
const lastCount = Math.max(0, this.maxVisibleFailed - firstCount);
const hiddenFailed = failed.length - this.maxVisibleFailed;
for (const child of failed.slice(0, firstCount)) {
lines.push(`✗ ${getInlineToolDescription(child.name, child.input)}`);
}
lines.push(`✗ ... ${hiddenFailed} more failed`);
Eif (lastCount > 0) {
for (const child of failed.slice(-lastCount)) {
lines.push(`✗ ${getInlineToolDescription(child.name, child.input)}`);
}
}
} else {
for (const child of failed) {
lines.push(`✗ ${getInlineToolDescription(child.name, child.input)}`);
}
}
// Show only the most recent completed items, collapse older ones
const hiddenCompleted = completed.length - this.maxVisibleCompleted;
if (hiddenCompleted > 0) {
lines.push(`✓ ... ${hiddenCompleted} more completed`);
}
const visibleCompleted = completed.slice(-this.maxVisibleCompleted);
for (const child of visibleCompleted) {
lines.push(`✓ ${getInlineToolDescription(child.name, child.input)}`);
}
// Add progress summary using stats counts (not local arrays)
const completedCount = stats.completed;
const failedCount = stats.failed;
const totalCount = stats.total;
const doneCount = completedCount + failedCount;
const runningCount = totalCount - doneCount;
const parts = [];
if (runningCount > 0) parts.push(`${runningCount} running`);
if (completedCount > 0) parts.push(`${completedCount} done`);
if (failedCount > 0) parts.push(`${failedCount} failed`);
Eif (parts.length > 0) {
lines.push(`── ${parts.join(', ')} (${doneCount}/${totalCount}) ──`);
}
// Return as ACP content array (single text block with all lines)
return [{ type: 'content', content: { type: 'text', text: lines.join('\n') } }];
}
clear() {
this.childTools.clear();
this.parentStats.clear();
}
}
export function toAcpNotifications(
msg,
sessionId,
activeToolCalls = new Map(),
_clientCapabilities = {},
nestedTracker = null
) {
const output = [];
const inlineMode = config.nestedToolMode === 'inline';
/**
* Generate a session-unique ACP tool call ID from an Amp tool_use_id
* If the ID already exists, generate a unique replacement and track the mapping
* @param {string} ampId - Original Amp tool_use_id
* @returns {string} - Session-unique ACP tool call ID
*/
const getUniqueToolCallId = (ampId) => {
if (!activeToolCalls.has(ampId)) {
return ampId; // ID is unique, use as-is
}
// Generate unique replacement ID
const uniqueId = `${ampId}_${Date.now().toString(36)}_${Math.random().toString(36).slice(2, 6)}`;
logProtocol.warn('Generated unique toolCallId for duplicate', {
originalId: ampId,
uniqueId,
sessionId,
});
return uniqueId;
};
/**
* Find the ACP tool call ID for a given Amp tool_use_id
* Handles both direct matches and ampId->acpId mappings
* @param {string} ampId - Original Amp tool_use_id from tool_result
* @returns {string|null} - ACP tool call ID or null if not found
*/
const findAcpToolCallId = (ampId) => {
// Direct match (most common case - ID wasn't remapped)
if (activeToolCalls.has(ampId)) {
return ampId;
}
// Search for mapped ID
for (const [acpId, toolCall] of activeToolCalls) {
if (toolCall.ampId === ampId) {
return acpId;
}
}
return null;
};
// Track tool call state transitions for validation
const validateStatusTransition = (toolCallId, newStatus) => {
const existingCall = activeToolCalls.get(toolCallId);
if (!existingCall) return true; // New tool call
const currentStatus = existingCall.lastStatus;
const validTransitions = {
in_progress: ['completed', 'failed'],
completed: [], // Terminal state
failed: [], // Terminal state
};
Iif (!validTransitions[currentStatus]?.includes(newStatus)) {
logProtocol.warn('Invalid status transition', {
toolCallId,
from: currentStatus,
to: newStatus,
validTransitions: validTransitions[currentStatus],
});
return false;
}
return true;
};
switch (msg.type) {
case 'system':
Eif (msg.subtype === 'init') {
const mcpList = msg.mcp_servers?.map((s) => `${s.name} (${s.status})`).join(', ') || 'none';
output.push({
sessionId,
update: {
sessionUpdate: 'agent_thought_chunk',
content: {
type: 'text',
text: `Session started. Tools: ${msg.tools?.length || 0}, MCP Servers: ${mcpList}`,
},
},
});
}
break;
case 'user':
// User messages contain tool_result content
Eif (Array.isArray(msg.message?.content)) {
for (const chunk of msg.message.content) {
if (chunk.type === 'tool_result') {
const isError = chunk.is_error;
const status = isError ? 'failed' : 'completed';
const ampId = chunk.tool_use_id;
// Find the ACP tool call ID (handles remapped IDs)
const acpToolCallId = findAcpToolCallId(ampId) || ampId;
// Validate status transition before emitting
Iif (!validateStatusTransition(acpToolCallId, status)) {
logProtocol.warn('Skipping invalid tool result status transition', {
toolCallId: acpToolCallId,
ampId,
attemptedStatus: status,
});
continue;
}
// Check if this is a child tool result in inline mode
if (inlineMode && nestedTracker) {
const childInfo = nestedTracker.completeChild(ampId, isError);
Eif (childInfo) {
// Emit full content array on PARENT (ACP replaces content, not appends)
output.push({
sessionId,
update: {
toolCallId: childInfo.parentToolUseId,
sessionUpdate: 'tool_call_update',
content: nestedTracker.getContentArray(childInfo.parentToolUseId),
},
});
continue; // Don't emit separate tool_call_update for child
}
}
// Normal (non-child) tool result
activeToolCalls.delete(acpToolCallId);
output.push({
sessionId,
update: {
toolCallId: acpToolCallId,
sessionUpdate: 'tool_call_update',
status,
content: toAcpContentArray(chunk.content, isError),
},
});
}
// Ignore text chunks in user messages - they're internal model context, not user input
}
}
break;
case 'assistant':
Eif (Array.isArray(msg.message?.content)) {
for (const chunk of msg.message.content) {
if (chunk.type === 'text') {
// Text from subagent goes to parent as thought, not message
Iif (msg.parent_tool_use_id && inlineMode) {
// Skip subagent text in inline mode - the summary comes in tool_result
continue;
}
output.push({
sessionId,
update: {
sessionUpdate: 'agent_message_chunk',
content: { type: 'text', text: chunk.text },
},
});
} else if (chunk.type === 'tool_use') {
// Generate session-unique tool call ID (handles duplicates)
const ampId = chunk.id;
const acpToolCallId = getUniqueToolCallId(ampId);
const isChildTool = !!msg.parent_tool_use_id;
// In inline mode, embed child tool calls into parent's content
if (inlineMode && isChildTool && nestedTracker) {
// Register this child tool (use original ampId for Amp correlation)
nestedTracker.registerChild(ampId, msg.parent_tool_use_id, chunk.name, chunk.input);
// Emit full content array on the parent (ACP replaces content, not appends)
output.push({
sessionId,
update: {
toolCallId: msg.parent_tool_use_id,
sessionUpdate: 'tool_call_update',
content: nestedTracker.getContentArray(msg.parent_tool_use_id),
},
});
continue; // Don't emit separate tool_call for child
}
// Build locations array for file-based tools
const locations = getToolLocations(chunk.name, chunk.input);
// Build _meta for nested tool calls (subagent/oracle) in separate mode
const meta = msg.parent_tool_use_id ? { parentToolCallId: msg.parent_tool_use_id } : undefined;
// Track tool call state with ampId mapping - start directly as in_progress
activeToolCalls.set(acpToolCallId, {
ampId, // Store original Amp ID for correlation
name: chunk.name,
startTime: Date.now(),
lastStatus: 'in_progress',
});
// Emit tool_call with status: in_progress directly (skip pending for atomic emission)
// This prevents orphan states if the first emission fails
output.push({
sessionId,
update: {
toolCallId: acpToolCallId,
sessionUpdate: 'tool_call',
rawInput: JSON.stringify(chunk.input),
status: 'in_progress',
title: getToolTitle(chunk.name, msg.parent_tool_use_id, chunk.input),
kind: getToolKind(chunk.name),
content: [],
...(locations.length > 0 && { locations }),
...(meta && { _meta: meta }),
},
});
} else Eif (chunk.type === 'thinking') {
output.push({
sessionId,
update: {
sessionUpdate: 'agent_thought_chunk',
content: { type: 'text', text: chunk.thinking },
},
});
}
}
}
break;
case 'result':
// Final result - could emit a summary if needed
Eif (msg.subtype === 'error_during_execution' || msg.subtype === 'error_max_turns') {
output.push({
sessionId,
update: {
sessionUpdate: 'agent_message_chunk',
content: { type: 'text', text: `Error: ${msg.error}` },
},
});
}
break;
default:
break;
}
return output;
}
function toAcpContentArray(content, isError = false) {
if (Array.isArray(content) && content.length > 0) {
return content.map((c) => ({
type: 'content',
content: c.type === 'text' ? { type: 'text', text: isError ? wrapCode(c.text) : c.text } : c,
}));
}
Eif (typeof content === 'string' && content.length > 0) {
return [{ type: 'content', content: { type: 'text', text: isError ? wrapCode(content) : content } }];
}
return [];
}
function wrapCode(t) {
return '```\n' + t + '\n```';
}
/**
* Check if a message chunk is a Bash tool_use
*/
export function isBashToolUse(chunk) {
return chunk?.type === 'tool_use' && chunk?.name === 'Bash';
}
/**
* Extract tool result info from a tool_result chunk
*/
export function getToolResult(chunk) {
if (chunk?.type !== 'tool_result') return null;
// Return the tool_use_id; caller tracks which tool type it was
return { toolUseId: chunk.tool_use_id };
}
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