agentfootprint/dist/esm/core/agent/middleware/messagePhase.js

The explainable agent framework — backtrack a wrong answer to the exact context that caused it (evidence, not guesses). Built on footprintjs.

import { allow } from './outcomes.js';
// Only wrappers made here can promise not to inspect output. Ordinary callbacks
// can branch on either phase, so their delivery must wait for the output walk.
const phases = new WeakMap();
/** Bind a declared phase without changing the other phase's recorded allow row. */
export function messageAt(phase, middleware) {
    const wrapped = {
        name: middleware.name,
        onMessage: (message) => (message.phase === phase ? middleware.onMessage(message) : allow()),
    };
    phases.set(wrapped, phase);
    // Keep the declared phase inseparable from its guard; the caller's rule stays mutable.
    return Object.freeze(wrapped);
}
/** Build-time knowledge, never an inference from a callback's name or source. */
export function hasOutputMiddleware(chain) {
    return chain.some((middleware) => phases.get(middleware) !== 'input');
}
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