Plugin Runtime Helpers
Reference for the api.runtime object injected into every plugin during
registration. Use these helpers instead of importing host internals directly.
register(api) {
const runtime = api.runtime;
}
Runtime namespaces
api.runtime.agent
Agent identity, directories, and session management.
// Resolve the agent's working directory
const agentDir = api.runtime.agent.resolveAgentDir(cfg);
// Resolve agent workspace
const workspaceDir = api.runtime.agent.resolveAgentWorkspaceDir(cfg);
// Get agent identity
const identity = api.runtime.agent.resolveAgentIdentity(cfg);
// Get default thinking level
const thinking = api.runtime.agent.resolveThinkingDefault(cfg, provider, model);
// Get agent timeout
const timeoutMs = api.runtime.agent.resolveAgentTimeoutMs(cfg);
// Ensure workspace exists
await api.runtime.agent.ensureAgentWorkspace(cfg);
// Run an embedded Pi agent
const agentDir = api.runtime.agent.resolveAgentDir(cfg);
const result = await api.runtime.agent.runEmbeddedPiAgent({
sessionId: "my-plugin:task-1",
runId: crypto.randomUUID(),
sessionFile: path.join(agentDir, "sessions", "my-plugin-task-1.jsonl"),
workspaceDir: api.runtime.agent.resolveAgentWorkspaceDir(cfg),
prompt: "Summarize the latest changes",
timeoutMs: api.runtime.agent.resolveAgentTimeoutMs(cfg),
});
Session store helpers are under api.runtime.agent.session:
const storePath = api.runtime.agent.session.resolveStorePath(cfg);
const store = api.runtime.agent.session.loadSessionStore(cfg);
await api.runtime.agent.session.saveSessionStore(cfg, store);
const filePath = api.runtime.agent.session.resolveSessionFilePath(cfg, sessionId);
api.runtime.agent.defaults
Default model and provider constants:
const model = api.runtime.agent.defaults.model; // e.g. "anthropic/claude-sonnet-4-6"
const provider = api.runtime.agent.defaults.provider; // e.g. "anthropic"
api.runtime.subagent
Launch and manage background subagent runs.
// Start a subagent run
const { runId } = await api.runtime.subagent.run({
sessionKey: "agent:main:subagent:search-helper",
message: "Expand this query into focused follow-up searches.",
provider: "openai", // optional override
model: "gpt-4.1-mini", // optional override
deliver: false,
});
// Wait for completion
const result = await api.runtime.subagent.waitForRun({ runId, timeoutMs: 30000 });
// Read session messages
const { messages } = await api.runtime.subagent.getSessionMessages({
sessionKey: "agent:main:subagent:search-helper",
limit: 10,
});
// Delete a session
await api.runtime.subagent.deleteSession({
sessionKey: "agent:main:subagent:search-helper",
});
Model overrides (provider/model) require operator opt-in via
plugins.entries.<id>.subagent.allowModelOverride: true in config.
Untrusted plugins can still run subagents, but override requests are rejected.
api.runtime.tts
Text-to-speech synthesis.
// Standard TTS
const clip = await api.runtime.tts.textToSpeech({
text: "Hello from FluffBuzz",
cfg: api.config,
});
// Telephony-optimized TTS
const telephonyClip = await api.runtime.tts.textToSpeechTelephony({
text: "Hello from FluffBuzz",
cfg: api.config,
});
// List available voices
const voices = await api.runtime.tts.listVoices({
provider: "elevenlabs",
cfg: api.config,
});
Uses core messages.tts configuration and provider selection. Returns PCM audio
buffer + sample rate.
Image, audio, and video analysis.
// Describe an image
const image = await api.runtime.mediaUnderstanding.describeImageFile({
filePath: "/tmp/inbound-photo.jpg",
cfg: api.config,
agentDir: "/tmp/agent",
});
// Transcribe audio
const { text } = await api.runtime.mediaUnderstanding.transcribeAudioFile({
filePath: "/tmp/inbound-audio.ogg",
cfg: api.config,
mime: "audio/ogg", // optional, for when MIME cannot be inferred
});
// Describe a video
const video = await api.runtime.mediaUnderstanding.describeVideoFile({
filePath: "/tmp/inbound-video.mp4",
cfg: api.config,
});
// Generic file analysis
const result = await api.runtime.mediaUnderstanding.runFile({
filePath: "/tmp/inbound-file.pdf",
cfg: api.config,
});
Returns { text: undefined } when no output is produced (e.g. skipped input).
api.runtime.stt.transcribeAudioFile(...) remains as a compatibility alias
for api.runtime.mediaUnderstanding.transcribeAudioFile(...).
api.runtime.imageGeneration
Image generation.
const result = await api.runtime.imageGeneration.generate({
prompt: "A robot painting a sunset",
cfg: api.config,
});
const providers = api.runtime.imageGeneration.listProviders({ cfg: api.config });
api.runtime.webSearch
Web search.
const providers = api.runtime.webSearch.listProviders({ config: api.config });
const result = await api.runtime.webSearch.search({
config: api.config,
args: { query: "FluffBuzz plugin SDK", count: 5 },
});
Low-level media utilities.
const webMedia = await api.runtime.media.loadWebMedia(url);
const mime = await api.runtime.media.detectMime(buffer);
const kind = api.runtime.media.mediaKindFromMime("image/jpeg"); // "image"
const isVoice = api.runtime.media.isVoiceCompatibleAudio(filePath);
const metadata = await api.runtime.media.getImageMetadata(filePath);
const resized = await api.runtime.media.resizeToJpeg(buffer, { maxWidth: 800 });
api.runtime.config
Config load and write.
const cfg = await api.runtime.config.loadConfig();
await api.runtime.config.writeConfigFile(cfg);
api.runtime.system
System-level utilities.
await api.runtime.system.enqueueSystemEvent(event);
api.runtime.system.requestHeartbeatNow();
const output = await api.runtime.system.runCommandWithTimeout(cmd, args, opts);
const hint = api.runtime.system.formatNativeDependencyHint(pkg);
api.runtime.events
Event subscriptions.
api.runtime.events.onAgentEvent((event) => {
/* ... */
});
api.runtime.events.onSessionTranscriptUpdate((update) => {
/* ... */
});
api.runtime.logging
Logging.
const verbose = api.runtime.logging.shouldLogVerbose();
const childLogger = api.runtime.logging.getChildLogger({ plugin: "my-plugin" }, { level: "debug" });
api.runtime.modelAuth
Model and provider auth resolution.
const auth = await api.runtime.modelAuth.getApiKeyForModel({ model, cfg });
const providerAuth = await api.runtime.modelAuth.resolveApiKeyForProvider({
provider: "openai",
cfg,
});
api.runtime.state
State directory resolution.
const stateDir = api.runtime.state.resolveStateDir();
Memory tool factories and CLI.
const getTool = api.runtime.tools.createMemoryGetTool(/* ... */);
const searchTool = api.runtime.tools.createMemorySearchTool(/* ... */);
api.runtime.tools.registerMemoryCli(/* ... */);
api.runtime.channel
Channel-specific runtime helpers (available when a channel plugin is loaded).
Storing runtime references
Use createPluginRuntimeStore to store the runtime reference for use outside
the register callback:
import { createPluginRuntimeStore } from "fluffbuzz/plugin-sdk/runtime-store";
import type { PluginRuntime } from "fluffbuzz/plugin-sdk/runtime-store";
const store = createPluginRuntimeStore<PluginRuntime>("my-plugin runtime not initialized");
// In your entry point
export default defineChannelPluginEntry({
id: "my-plugin",
name: "My Plugin",
description: "Example",
plugin: myPlugin,
setRuntime: store.setRuntime,
});
// In other files
export function getRuntime() {
return store.getRuntime(); // throws if not initialized
}
export function tryGetRuntime() {
return store.tryGetRuntime(); // returns null if not initialized
}
Other top-level api fields
Beyond api.runtime, the API object also provides:
| Field | Type | Description |
|---|
api.id | string | Plugin id |
api.name | string | Plugin display name |
api.config | FluffBuzzConfig | Current config snapshot |
api.pluginConfig | Record<string, unknown> | Plugin-specific config from plugins.entries.<id>.config |
api.logger | PluginLogger | Scoped logger (debug, info, warn, error) |
api.registrationMode | PluginRegistrationMode | "full", "setup-only", or "setup-runtime" |
api.resolvePath(input) | (string) => string | Resolve a path relative to the plugin root |