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* Agent Sessions - Programmatic API for AI agents
*
* Track agent runs with automatic file watching, git tracking,
* AI cost logging, and budget enforcement.
*
* @example
* ```typescript
* import { AgentSession } from 'codesession-cli/agents';
*
* const session = new AgentSession('Refactor auth module', {
* budget: 5.00,
* directory: './src',
* git: true,
* });
*
* session.start();
* // ... agent does work ...
* const summary = session.end();
* ```
*/
import {
createSession,
endSession as dbEndSession,
getSession,
addAIUsage,
getFileChanges,
getCommits,
getAIUsage,
} from './db';
import { initGit, startGitPolling, stopGitPolling, checkForNewCommits, cleanupGit } from './git';
import { startWatcher, stopWatcher, cleanupWatcher } from './watcher';
export interface AgentSessionConfig {
/** Hard budget cap in dollars. Session auto-ends if exceeded. */
budget?: number;
/** Directory to watch for file changes. Defaults to cwd. */
directory?: string;
/** Enable git commit tracking. Defaults to true. */
git?: boolean;
/** Interval (ms) to check for new git commits. Defaults to 5000. */
gitPollInterval?: number;
/** Callback when budget is exceeded. Called before session ends. */
onBudgetExceeded?: (spent: number, budget: number) => void;
/** Callback when AI usage is logged. */
onAIUsage?: (cost: number, totalCost: number, model: string) => void;
/** Callback on each file change. */
onFileChange?: (filePath: string, changeType: string) => void;
/** Optional metadata to attach to the session. */
metadata?: Record<string, any>;
}
export interface AgentSessionSummary {
sessionId: number;
name: string;
duration: number;
filesChanged: number;
commits: number;
aiCost: number;
aiTokens: number;
budgetRemaining: number | null;
files: { path: string; type: string; timestamp: string }[];
commitList: { hash: string; message: string; timestamp: string }[];
aiUsageBreakdown: { provider: string; model: string; tokens: number; cost: number; timestamp: string }[];
metadata?: Record<string, any>;
}
export class AgentSession {
private sessionId: number | null = null;
private name: string;
private config: AgentSessionConfig;
private totalCost = 0;
private totalTokens = 0;
private started = false;
private ended = false;
constructor(name: string, config: AgentSessionConfig = {}) {
this.name = name;
this.config = {
git: true,
gitPollInterval: 5000,
...config,
};
}
/**
* Start the agent session. Begins file watching and git tracking.
* @returns The session ID
*/
start(): number {
if (this.started) {
throw new Error(`Session "${this.name}" is already started.`);
}
Iif (this.ended) {
throw new Error(`Session "${this.name}" has already ended. Create a new AgentSession.`);
}
const cwd = this.config.directory || process.cwd();
this.sessionId = createSession({
name: this.name,
startTime: new Date().toISOString(),
workingDirectory: cwd,
filesChanged: 0,
commits: 0,
aiCost: 0,
aiTokens: 0,
status: 'active',
});
// Start file watcher
startWatcher(this.sessionId, cwd);
// Start git polling
Iif (this.config.git) {
initGit(this.sessionId, cwd);
startGitPolling(this.sessionId, this.config.gitPollInterval);
}
this.started = true;
return this.sessionId;
}
/**
* Log AI usage for this session. Automatically checks budget.
* Cost is optional — auto-calculated from built-in pricing if omitted (requires known model).
* @returns The remaining budget (null if no budget set)
* @throws BudgetExceededError if budget is exceeded
*/
logAI(provider: string, model: string, tokens: number, cost: number, options?: { promptTokens?: number; completionTokens?: number; agentName?: string }): number | null {
this.assertStarted();
// Check budget BEFORE writing to database
const newTotalCost = this.totalCost + cost;
if (this.config.budget !== undefined && newTotalCost >= this.config.budget) {
// Write the usage to DB since it's the last allowed call, then end the session
addAIUsage({
sessionId: this.sessionId!,
provider,
model,
tokens,
promptTokens: options?.promptTokens,
completionTokens: options?.completionTokens,
cost,
agentName: options?.agentName,
timestamp: new Date().toISOString(),
});
this.totalCost = newTotalCost;
this.totalTokens += tokens;
if (this.config.onBudgetExceeded) {
this.config.onBudgetExceeded(newTotalCost, this.config.budget);
}
// End session before throwing so there's no orphaned active session
this.end(`Budget reached: $${newTotalCost.toFixed(2)} / $${this.config.budget.toFixed(2)}`);
throw new BudgetExceededError(newTotalCost, this.config.budget);
}
// Budget check passed - safe to write to DB
addAIUsage({
sessionId: this.sessionId!,
provider,
model,
tokens,
promptTokens: options?.promptTokens,
completionTokens: options?.completionTokens,
cost,
agentName: options?.agentName,
timestamp: new Date().toISOString(),
});
this.totalCost = newTotalCost;
this.totalTokens += tokens;
// Notify callback
if (this.config.onAIUsage) {
this.config.onAIUsage(cost, this.totalCost, model);
}
return this.config.budget !== undefined
? Math.max(0, this.config.budget - this.totalCost)
: null;
}
/**
* Check how much budget remains.
* @returns Remaining budget in dollars, or null if no budget set
*/
get budgetRemaining(): number | null {
Iif (this.config.budget === undefined) return null;
return Math.max(0, this.config.budget - this.totalCost);
}
/** Current total cost spent in this session */
get spent(): number {
return this.totalCost;
}
/** Current total tokens used in this session */
get tokens(): number {
return this.totalTokens;
}
/** Whether this session is currently active */
get isActive(): boolean {
return this.started && !this.ended;
}
/** The database session ID (null if not started) */
get id(): number | null {
return this.sessionId;
}
/**
* End the agent session and return a full summary.
*/
end(notes?: string): AgentSessionSummary {
this.assertStarted();
// Stop tracking
stopWatcher(this.sessionId!);
stopGitPolling(this.sessionId!);
cleanupGit(this.sessionId!);
const endTime = new Date().toISOString();
dbEndSession(this.sessionId!, endTime, notes);
this.ended = true;
// Build summary
const session = getSession(this.sessionId!)!;
const files = getFileChanges(this.sessionId!);
const commits = getCommits(this.sessionId!);
const aiUsage = getAIUsage(this.sessionId!);
return {
sessionId: this.sessionId!,
name: this.name,
duration: session.duration || 0,
filesChanged: session.filesChanged,
commits: session.commits,
aiCost: session.aiCost,
aiTokens: session.aiTokens,
budgetRemaining: this.config.budget !== undefined
? Math.max(0, this.config.budget - session.aiCost)
: null,
files: files.map((f) => ({
path: f.filePath,
type: f.changeType,
timestamp: f.timestamp,
})),
commitList: commits.map((c) => ({
hash: c.hash,
message: c.message,
timestamp: c.timestamp,
})),
aiUsageBreakdown: aiUsage.map((a) => ({
provider: a.provider,
model: a.model,
tokens: a.tokens,
cost: a.cost,
timestamp: a.timestamp,
})),
metadata: this.config.metadata,
};
}
/**
* Check if an AI call would exceed the budget.
* Useful for pre-flight checks before making expensive API calls.
* @returns true if the call would stay within budget
*/
canAfford(estimatedCost: number): boolean {
if (this.config.budget === undefined) return true;
return this.totalCost + estimatedCost <= this.config.budget;
}
private assertStarted(): void {
if (!this.started) {
throw new Error(`Session "${this.name}" has not been started. Call .start() first.`);
}
if (this.ended) {
throw new Error(`Session "${this.name}" has already ended.`);
}
}
}
/**
* Thrown when an agent session exceeds its budget.
* Catch this to handle budget enforcement gracefully.
*
* @example
* ```typescript
* try {
* session.logAI('openai', 'gpt-4o', 5000, 0.10);
* } catch (e) {
* if (e instanceof BudgetExceededError) {
* console.log(`Over budget: spent $${e.spent}, limit $${e.budget}`);
* }
* }
* ```
*/
export class BudgetExceededError extends Error {
public spent: number;
public budget: number;
constructor(spent: number, budget: number) {
super(`Budget exceeded: spent $${spent.toFixed(2)} of $${budget.toFixed(2)} limit`);
this.name = 'BudgetExceededError';
this.spent = spent;
this.budget = budget;
}
}
/**
* Quick helper to run an agent function within a tracked session.
* Handles start/end/error automatically.
*
* @example
* ```typescript
* const summary = await runAgentSession('Fix all linting errors', {
* budget: 3.00,
* directory: './src',
* }, async (session) => {
* // Your agent logic here
* const response = await openai.chat.completions.create({ ... });
* session.logAI('openai', 'gpt-4o', response.usage.total_tokens, 0.05);
* });
* ```
*/
export async function runAgentSession(
name: string,
config: AgentSessionConfig,
agentFn: (session: AgentSession) => Promise<void>
): Promise<AgentSessionSummary> {
const session = new AgentSession(name, config);
session.start();
try {
await agentFn(session);
} catch (error) {
if (error instanceof BudgetExceededError) {
// Session already ended by logAI, return summary from DB
const dbSession = getSession(session.id!);
Iif (!dbSession) {
// Shouldn't happen, but guard against it
return {
sessionId: session.id!,
name,
duration: 0,
filesChanged: 0,
commits: 0,
aiCost: 0,
aiTokens: 0,
budgetRemaining: 0,
files: [],
commitList: [],
aiUsageBreakdown: [],
metadata: config.metadata,
};
}
const files = getFileChanges(session.id!);
const commits = getCommits(session.id!);
const aiUsage = getAIUsage(session.id!);
return {
sessionId: session.id!,
name,
duration: dbSession.duration || 0,
filesChanged: dbSession.filesChanged,
commits: dbSession.commits,
aiCost: dbSession.aiCost,
aiTokens: dbSession.aiTokens,
budgetRemaining: 0,
files: files.map((f) => ({ path: f.filePath, type: f.changeType, timestamp: f.timestamp })),
commitList: commits.map((c) => ({ hash: c.hash, message: c.message, timestamp: c.timestamp })),
aiUsageBreakdown: aiUsage.map((a) => ({ provider: a.provider, model: a.model, tokens: a.tokens, cost: a.cost, timestamp: a.timestamp })),
metadata: config.metadata,
};
}
// For non-budget errors, end session with error note and re-throw
Eif (session.isActive) {
session.end(`Error: ${(error as Error).message}`);
}
throw error;
}
if (session.isActive) {
return session.end();
}
// Session was ended during agentFn (e.g. explicit end call)
const dbSession = getSession(session.id!)!;
const files = getFileChanges(session.id!);
const commitsList = getCommits(session.id!);
const aiUsage = getAIUsage(session.id!);
return {
sessionId: session.id!,
name,
duration: dbSession.duration || 0,
filesChanged: dbSession.filesChanged,
commits: dbSession.commits,
aiCost: dbSession.aiCost,
aiTokens: dbSession.aiTokens,
budgetRemaining: config.budget !== undefined ? Math.max(0, config.budget - dbSession.aiCost) : null,
files: files.map((f) => ({ path: f.filePath, type: f.changeType, timestamp: f.timestamp })),
commitList: commitsList.map((c) => ({ hash: c.hash, message: c.message, timestamp: c.timestamp })),
aiUsageBreakdown: aiUsage.map((a) => ({ provider: a.provider, model: a.model, tokens: a.tokens, cost: a.cost, timestamp: a.timestamp })),
metadata: config.metadata,
};
}
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