It is good - VERY good, that a possibility has opened for a negotiated settlement, to avoid a US military strike in Syria. This is the best possible outcome; no strike will mean no death, destruction, and the long list of bad consequences that such a strike would bring about.
BUT: This is no time to reduce telling Congress "no attack."
The administration says that only the threat of an attack brought about the possible negotiated proposal. DO NOT believe this. It has been YOUR STRONG, NATION-WIDE OPPOSITION to military action which first forced the White House to bring in Congress, and which now makes it necessary for the White House and the Pentagon to even consider a negotiated settlement.
The administration will reserve the "right" to come back to Congress for approval of military action; or, to proceed with military action without Congress addressing authorization. As we've seen time and time and time again, once a form of Congressional authorization is approved, or once an administration determines to act on its own, not matter what the "intent" was, no matter what supposed limitations are attached, the forces for war WILL BE UNLEASHED: the military lobby, the Pentagon, the munitions corporations, will be free to push through a military action and expansion – no matter what.
YOUR pressure, on the White House and the Congress, is the ONLY force which has gotten us this far. Now, it is crucial to increase the message: "no attack on Syria! Give PEACE a chance!"