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import { tmpdir } from "node:os";
import { join } from "node:path";
import { getModel } from "@earendil-works/pi-ai/compat";
import { Type } from "typebox";
import { afterEach, beforeEach, describe, expect, it } from "vitest";
import { DefaultResourceLoader } from "../src/core/resource-loader.ts";
import { createAgentSession } from "../src/core/sdk.ts";
import { SessionManager } from "../src/core/session-manager.ts";
import { SettingsManager } from "../src/core/settings-manager.ts";
import { createBashTool } from "../src/core/tools/bash.ts";
describe("AgentSession dynamic tool registration", () => {
let tempDir: string;
let agentDir: string;
beforeEach(() => {
tempDir = join(tmpdir(), `pi-dynamic-tool-test-${Date.now()}-${Math.random().toString(36).slice(2)}`);
agentDir = join(tempDir, "agent");
mkdirSync(agentDir, { recursive: true });
});
afterEach(() => {
if (tempDir && existsSync(tempDir)) {
rmSync(tempDir, { recursive: true, force: true });
}
});
it("exposes session state before custom bash spawn hooks and supports opting out", async () => {
const settingsManager = SettingsManager.create(tempDir, agentDir);
const sessionManager = SessionManager.create(tempDir, join(agentDir, "sessions"), { id: "bash-env-test" });
let sessionEnv: NodeJS.ProcessEnv | undefined;
let optedOutEnv: NodeJS.ProcessEnv | undefined;
const resourceLoader = new DefaultResourceLoader({
cwd: tempDir,
agentDir,
settingsManager,
extensionFactories: [
(pi) => {
pi.registerTool(
createBashTool(tempDir, {
spawnHook: (ctx) => {
sessionEnv = ctx.env;
return ctx;
},
}),
);
pi.registerTool({
...createBashTool(tempDir, {
exposeSessionEnvironment: false,
spawnHook: (ctx) => {
optedOutEnv = ctx.env;
return ctx;
},
}),
name: "bash_without_session_env",
label: "bash without session env",
});
},
],
});
await resourceLoader.reload();
const model = getModel("anthropic", "claude-sonnet-4-5")!;
const { session } = await createAgentSession({
cwd: tempDir,
agentDir,
model,
thinkingLevel: "high",
settingsManager,
sessionManager,
resourceLoader,
});
const bashTool = session.agent.state.tools.find((tool) => tool.name === "bash")!;
expect(session.systemPrompt).toContain(
"You can inspect PI_* environment variables for current model and session details.",
);
await bashTool.execute("bash-env", { command: "printf ok" });
expect(sessionEnv).toMatchObject({
PI_SESSION_ID: session.sessionId,
PI_SESSION_FILE: session.sessionFile,
PI_PROVIDER: model.provider,
PI_MODEL: model.id,
PI_REASONING_LEVEL: session.thinkingLevel,
});
const optedOutBashTool = session.agent.state.tools.find((tool) => tool.name === "bash_without_session_env")!;
await optedOutBashTool.execute("bash-no-env", { command: "printf ok" });
expect(optedOutEnv).not.toHaveProperty("PI_SESSION_ID");
expect(optedOutEnv).not.toHaveProperty("PI_SESSION_FILE");
expect(optedOutEnv).not.toHaveProperty("PI_PROVIDER");
expect(optedOutEnv).not.toHaveProperty("PI_MODEL");
expect(optedOutEnv).not.toHaveProperty("PI_REASONING_LEVEL");
session.dispose();
});
it("refreshes tool registry when tools are registered after initialization", async () => {
const settingsManager = SettingsManager.create(tempDir, agentDir);
const sessionManager = SessionManager.inMemory();
const resourceLoader = new DefaultResourceLoader({
cwd: tempDir,
agentDir,
settingsManager,
extensionFactories: [
(pi) => {
pi.on("session_start", () => {
pi.registerTool({
name: "dynamic_tool",
label: "Dynamic Tool",
description: "Tool registered from session_start",
promptSnippet: "Run dynamic test behavior",
promptGuidelines: ["Use dynamic_tool when the user asks for dynamic behavior tests."],
parameters: Type.Object({}),
execute: async () => ({
content: [{ type: "text", text: "ok" }],
details: {},
}),
});
});
},
],
});
await resourceLoader.reload();
const { session } = await createAgentSession({
cwd: tempDir,
agentDir,
model: getModel("anthropic", "claude-sonnet-4-5")!,
settingsManager,
sessionManager,
resourceLoader,
});
expect(session.getAllTools().map((tool) => tool.name)).not.toContain("dynamic_tool");
await session.bindExtensions({});
const allTools = session.getAllTools();
const dynamicTool = allTools.find((tool) => tool.name === "dynamic_tool");
const readTool = allTools.find((tool) => tool.name === "read");
expect(allTools.map((tool) => tool.name)).toContain("dynamic_tool");
expect(dynamicTool?.promptGuidelines).toEqual([
"Use dynamic_tool when the user asks for dynamic behavior tests.",
]);
expect(dynamicTool?.sourceInfo).toMatchObject({
path: "<inline:1>",
source: "inline",
scope: "temporary",
origin: "top-level",
});
expect(readTool?.sourceInfo).toMatchObject({
path: "<builtin:read>",
source: "builtin",
scope: "temporary",
origin: "top-level",
});
expect(session.getActiveToolNames()).toContain("dynamic_tool");
expect(session.systemPrompt).toContain("- dynamic_tool: Run dynamic test behavior");
expect(session.systemPrompt).toContain("- Use dynamic_tool when the user asks for dynamic behavior tests.");
session.dispose();
});
it("returns source metadata for SDK custom tools", async () => {
const settingsManager = SettingsManager.create(tempDir, agentDir);
const sessionManager = SessionManager.inMemory();
const resourceLoader = new DefaultResourceLoader({
cwd: tempDir,
agentDir,
settingsManager,
});
await resourceLoader.reload();
const { session } = await createAgentSession({
cwd: tempDir,
agentDir,
model: getModel("anthropic", "claude-sonnet-4-5")!,
settingsManager,
sessionManager,
resourceLoader,
customTools: [
{
name: "sdk_tool",
label: "SDK Tool",
description: "Tool registered through createAgentSession",
parameters: Type.Object({}),
execute: async () => ({
content: [{ type: "text", text: "ok" }],
details: {},
}),
},
],
});
const sdkTool = session.getAllTools().find((tool) => tool.name === "sdk_tool");
expect(sdkTool?.sourceInfo).toMatchObject({
path: "<sdk:sdk_tool>",
source: "sdk",
scope: "temporary",
origin: "top-level",
});
expect(session.getActiveToolNames()).toContain("sdk_tool");
session.dispose();
});
it("keeps custom tools active but omits them from available tools when promptSnippet is not provided", async () => {
const settingsManager = SettingsManager.create(tempDir, agentDir);
const sessionManager = SessionManager.inMemory();
const resourceLoader = new DefaultResourceLoader({
cwd: tempDir,
agentDir,
settingsManager,
extensionFactories: [
(pi) => {
pi.on("session_start", () => {
pi.registerTool({
name: "hidden_tool",
label: "Hidden Tool",
description: "Description should not appear in available tools",
parameters: Type.Object({}),
execute: async () => ({
content: [{ type: "text", text: "ok" }],
details: {},
}),
});
});
},
],
});
await resourceLoader.reload();
const { session } = await createAgentSession({
cwd: tempDir,
agentDir,
model: getModel("anthropic", "claude-sonnet-4-5")!,
settingsManager,
sessionManager,
resourceLoader,
});
await session.bindExtensions({});
expect(session.getAllTools().map((tool) => tool.name)).toContain("hidden_tool");
expect(session.getActiveToolNames()).toContain("hidden_tool");
expect(session.systemPrompt).not.toContain("hidden_tool");
expect(session.systemPrompt).not.toContain("Description should not appear in available tools");
session.dispose();
});
});
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