delivered the opinion of the Court.
Section 1291 of the Judicial Code confines appeals as of right to those from “final decisions of the district courts.” 28 U. S. C. § 1291. This case raises the question whether an order vacating a dismissal predicated on the parties’ settlement agreement is final as a collateral order even without a district court’s resolution of the underlying cause of action. See
Cohen
v.
Beneficial Industrial Loan Corp.,
I
Respondent, Desktop Direct, Inc. (Desktop), sells computers and like equipment under the trade name “Desktop Direct.” Petitioner, Digital Equipment Corporation, is engaged in a similar business and in late 1991 began using that trade name to market a new service it called “Desktop Direct from Digital.” In response, Desktop filed this action in the *866 United States District Court for the District of Utah, charging Digital with unlawful use of the Desktop Direct name. Desktop sent Digital a copy of the complaint, and negotiations between officers of the two corporations ensued. Under a confidential settlement reached on March 25, 1992, Digital agreed to pay Desktop a sum of money for the right to use the “Desktop Direct” trade name and corresponding trademark, and for waiver of all damages and dismissal of the suit. That same day, Desktop filed a notice of dismissal in the District Court.
Several months later, Desktop moved to vacate the dismissal and rescind the settlement agreement, alleging misrepresentation of material facts during settlement negotiations. The District Court granted the motion, concluding “that a fact finder could determine that [Digital] failed to disclose material facts to [Desktop] during settlement negotiations which would have resulted in rejection of the settlement offer.” App. to Pet. for Cert. 13a. After the District Court declined to reconsider that ruling or stay its order vacating dismissal, Digital appealed.
The Court of Appeals for the Tenth Circuit dismissed the appeal for lack of jurisdiction, holding that the District Court order was not appealable under §1291, because it neither “end[ed] the litigation on the merits” nor “[fell] within the long-recognized ‘collateral order’ exception to the final judgment requirement.”
The Tenth Circuit recognized that it was thus deviating from the rule followed in some other Courts of Appeals, see
Forbus
v.
Sears, Roebuck & Co.,
II
A
The collateral order doctrine is best understood not as an exception to the “final decision” rule laid down by Congress in § 1291, but as a “practical construction” of it,
Cohen, supra,
at 546; see,
e. g., Coopers & Lybrand, supra,
at 468. We have repeatedly held that the statute entitles a party to appeal not only from a district court decision that “ends the litigation on the merits and leaves nothing more for the court to do but execute the judgment,”
Catlin
v.
United States,
But we have also repeatedly stressed that the “narrow” exception should stay that way and never be allowed to swallow the general rule,
id.,
at 436, that a party is entitled to a single appeal, to be deferred until final judgment has been entered, in which claims of district court error at any stage of the litigation may be ventilated, see
United States
v.
Hollywood Motor Car Co.,
B
Here, the Court of Appeals accepted Digital’s claim that the order vacating dismissal (and so rescinding the settlement agreement) was the “final word on the subject addressed,”
C
The roots of Digital’s argument that the settlement with Desktop gave it a “right not to stand trial altogether” (and that such a right
per se
satisfies the third
Cohen
requirement) are readily traced to
Abney
v.
United States,
Abney’s rationale was applied in
Nixon
v.
Fitzgerald,
Next, in
Mitchell
v.
Forsyth,
D
Digital puts this case on all fours with Mitchell. It maintains that it obtained dual rights under the settlement agreement with Desktop, not only a broad defense to liability but the “right not to stand trial,” the latter being just like the qualified immunity held immediately appealable in Mitchell. As in Mitchell, that right must be enforceable on collateral order appeal, Digital asserts, or an adverse trial ruling will destroy it forever.
While Digital’s argument may exert some pull on a narrow analysis, it does not hold up under the broad scrutiny to which all claims of immediate appealability under §1291 must be subjected. To be sure, Abney and Mitchell are fairly cited for the proposition that orders denying certain immunities are strong candidates for prompt appeal under § 1291. But Digital’s larger contention, that a party’s ability to characterize a district court’s decision as denying an irreparable “right not to stand trial” altogether is sufficient as well as necessary for a collateral order appeal, is neither an accurate distillation of our case law nor an appealing prospect for adding to it.
Even as they have recognized the need for immediate appeals under § 1291 to vindicate rights that would be “irretrievably lost,”
Richardson-Merrell,
*873
Nor does limiting the focus to whether the interest asserted may be called a “right not to stand trial” offer much protection against the urge to push the § 1291 limits. We have, after all, acknowledged that virtually every right that could be enforced appropriately by pretrial dismissal might loosely be described as conferring a “right not to stand trial,” see,
e. g., Midland Asphalt,
*874
In
Midland Asphalt,
for example, we had no trouble in dispatching a defendant’s claim of entitlement to an immediate appeal from an order denying dismissal for alleged violation of Federal Rule of Criminal Procedure 6(e), forbidding disclosure of secret grand jury information. Noting “ ‘a crucial distinction between a right not to be tried and a right whose remedy requires the dismissal of charges,’ ”
The characterization issue surfaced again (and more ominously for Digital, see
infra,
at 880) in
Lauro Lines, supra,
where a defendant sought to appeal under §1291 from an order denying effect to a contractual provision that a Neapolitan court would be the forum for trying all disputes arising from the parties’ cruise-ship agreement. While we realized of course that the value of the forum-selection clause would be diminished if the defendant could be tried before appealing, we saw the contractual right to limit trial to an Italian forum as “different in kind” from the entitlement to “avoid
*875
suit altogether” that
Abney
and
Mitchell
held could be “adequately vindicated]” only on immediate appeal.
E
As Digital reads the cases, the only things standing in the way of an appeal to perfect its claimed rights under the settlement agreement are the lone statement in Midland Asphalt, to the effect that only explicit statutory and constitutional immunities may be appealed immediately under § 1291, and language (said to be stray) repeated in many of our collateral order decisions, suggesting that the “importance” of the right asserted is an independent condition of appeal-ability. See Brief for Petitioner 28-34. The first, Digital explains, cannot be reconciled with Mitchell’s holding, that denial of qualified immunity (which we would be hard pressed to call “explicitly ... guarantee^] ” by a particular constitutional or statutory provision) is a collateral order under § 1291; as between Mitchell and the Midland Asphalt dictum, Digital says, the dictum must give way.. As for the second obstacle, Digital adamantly maintains that “importance” has no place in a doctrine justified as supplying a gloss on Congress’s “final decision” language.
1
These arguments miss the mark. First, even if
Mitchell
could not be squared fully with the literal words of the
Midland Asphalt
sentence (but cf.
Lauro Lines,
Digital answers that the status under § 1291 of these other (seemingly analogous) rights should not give us pause, because the text and structure of this particular settlement with Desktop confer what no res judicata claimant could ever have, an express right not to stand trial.
5
But we cannot attach much significance one way or another to the supposed clarity of the agreement’s terms in this case. To ground a ruling here on whether this settlement agreement in terms confers the prized “right not to stand trial” (a point Desktop by no means concedes) would flout our own frequent admonitions, see,
e. g., Van Cauwenberghe,
2
The more fundamental response, however, to the claim that an agreement's provision for immunity from trial can *878 distinguish it from other arguable rights to be trial free is simply that such a right by agreement does not rise to the level of importance needed for recognition under §1291. This, indeed, is the bone of the fiercest contention in the case. In disparaging any distinction between an order denying a claim grounded on an explicit constitutional guarantee of immunity from trial and an order at odds with an equally explicit right by private agreement of the parties, Digital stresses that the relative “importance” of these rights, heavily relied upon by the Court of Appeals, is a rogue factor. No decision of this Court, Digital maintains, has held an order unappealable as “unimportant” when it has otherwise met the three Cohen requirements, and whether a decided issue is thought “important,” it says, should have no bearing on whether it is “final” under § 1291.
If “finality” were as narrow a concept as Digital maintains, however, the Court would have had little reason to go beyond the first factor in
Cohen,
see also
United States
v.
243.22 Acres of Land in Babylon, Suffolk Cty.,
While there is no need to decide here that a privately conferred right could never supply the basis of a collateral order appeal, but cf. n. 7,
infra
(discussing 9 U. S. C. § 16), there are surely sound reasons for treating such rights differently from those originating in the Constitution or statutes. When a policy is embodied in a constitutional or statutory provision entitling a party to immunity from suit (a rare form of protection), there is little room for the judiciary to gainsay its “importance.” Including a provision in a private contract, by contrast, is barely a prima facie indication that the right secured is “important” to the benefited party (contracts being replete with boilerplate), let alone that its value exceeds that of other rights not embodied in agreements
(e. g.,
the right to be free from a second suit based on a claim that has already been litigated), or that it qualifies as “important” in
Cohen’s
sense, as being weightier than the societal interests advanced by the ordinary operation of final judgment principles. Where statutory and constitutional rights are concerned, “irretrievably] los[s]” can hardly be trivial, and the collateral order doctrine might therefore be understood as reflecting the familiar principle of statutory construction that, when possible, courts should construe statutes (here § 1291) to foster harmony with other statutory and constitutional law, see,
e. g., Ruckelshaus
v.
Monsanto Co.,
Indeed, we do not take issue with the Tenth Circuit’s observation that this case shares more in common with Lauro Lines than with Mitchell. It is hard to see how, for purposes of § 1291, the supposedly explicit “right not to be tried” element of the settlement agreement in this case differs from the unarguably explicit, privately negotiated “right not to be tried in any forum other than Naples, Italy,” in that one. There, no less than here (if Digital reads the settlement agreement correctly), one private party secured from another a promise not to bring suit for reasons that presumably included avoiding the burden, expense, and perhaps embarrassment of a certain class of trials (all but Neapolitan ones or, here, all prompted by Desktop). Cf. Lauro Lines, supra, at 501 (asserted right was “surely as effectively vindicable” on final judgment appeal as was the right in Van Cauwenberghe). 8 The losing argument in Lauro Lines should be a losing argument here.
*881 Nor are we swayed by Digital’s last-ditch effort to come within Cohen’s sense of “importance” by trying to show that settlement-agreement “immunities” merit first-class treatment for purposes of collateral order appeal, because they advance the public policy favoring voluntary resolution of disputes. It defies common sense to maintain that parties’ readiness to settle will be significantly dampened (or the corresponding public interest impaired) by a rule that a district court’s decision to let allegedly barred litigation go forward may be challenged as a matter of right only on appeal from a judgment for the plaintiff’s favor.
Ill
A
Even, finally, if the term “importance” were to be exorcised from the
Cohen
analysis altogether, Digital’s rights would remain “adequately vindicable” or “effectively reviewable” on final judgment to an extent that other immunities, like the right to be free from a second trial on a criminal charge, are not. As noted already, experience suggests that freedom from trial is rarely the
sine qua non
(or “the essence,” see
Van Cauwenberghe,
The case for adequate vindication without immediate appeal is strengthened, moreover, by recognizing that a settling party has a source of recompense unknown to trial immunity claimants dependent on public law alone. The essence of Digital’s claim here is that Desktop, for valuable consideration, promised not to sue, and we have been given no reason to doubt that Utah law provides for the enforcement of that promise in the same way that other rights arising from private agreements are enforced, through an action for breach of contract. See, e.
g., VanDyke
v.
Mountain Coin Machine Distributors, Inc.,
B
In preserving the strict limitations on review as of right under § 1291, our holding should cause no dismay, for the law is not without its safety valve to deal with cases where the contest over a settlement’s enforceability raises serious legal questions taking the case out of the ordinary run. While Digital’s insistence that the District Court applied a fundamentally wrong legal standard in vacating the dismissal order here may not be considered in deciding appealability under §1291, see n. 6,
supra,
it plainly is relevant to the availability of the discretionary interlocutory appeal from particular district court orders “involv[ing] a controlling question of law as to which there is substantial ground for difference of opinion,” provided for in § 1292(b) of Title 28. Indeed, because we suppose that a defendant’s claimed entitlement to a privately negotiated “immunity from suit” could in some instances raise “a controlling question of law . . . [which]... may materially advance the ultimate termination of the litigation,” the discretionary appeal provision (allowing courts to consider the merits of individual claims) would seem a better vehicle for vindicating serious contractual interpretation claims than the blunt, categorical instrument of §1291 collateral order appeal. See
Van Cauwenberghe,
*884 IV
The words of § 1291 have long been construed to recognize that certain categories of prejudgment decisions exist for which it is both justifiable and necessary to depart from the general rule, that “the whole case and every matter in controversy in it [must be] decided in a single appeal.”
McLish
v.
Roff,
Affirmed.
Notes
The Tenth Circuit also denied Digital’s request to stay the District Court proceedings. We granted a stay pending our disposition of Digital’s petition for certiorari.
It might be argued that given the District Court’s “somewhat cryptic” reference,
We have of course held that the
Cohen
requirements go to an appellate court’s subject-matter jurisdiction, see
Firestone Tire & Rubber Co.
v.
Risjord,
That reasoning echoed our decision one Term earlier in
Van Cauwenberghe
v.
Biard,
But c£
Home Building & Loan Assn.
v.
Blaisdell,
Similarly, we must reject as patently irrelevant for § 1291 purposes Digital’s repeated claims that the District Court applied the “wrong legal standard” in granting Desktop’s motion to vacate the dismissal order. If Digital is right that a settlement agreement confers a contractual “immunity from suit,” that protection is no more “irretrievably lost,” and thus no more appealable under § 1291, when a district court applies an erroneous legal standard than when it commits a plain vanilla mistake in misapplying the proper standard.
Nor do we accept uncritically Digital’s novel and highly convenient contention that such a right to be free from trial is, either in this case or generally, more valuable than other rights conferred by a settlement agreement. See infra, at 881-882. While Digital emphasizes that, under the terms of the settlement here, Desktop is owed a larger sum for “dismissal of the above referenced lawsuit and a waiver of all damages” than for “all rights to the Trademarks,” that proves little, if anything. To compare those two amounts is to place the bargained-for damages waiver on the wrong side of the ledger: that (typically quite valuable) right is precisely the sort that is fully vindicable on postjudgment appeal. Moreover, even if a high price tag might otherwise be an indicator of a right’s “importance” to the benefited party, we cannot ignore that settlement agreement “prices” may be structured for tax, accounting, and business strategy reasons that have nothing to do with their true value to the party.
This is not to say that rights originating in a private agreement may never be important enough to warrant immediate appeal. To the contrary, Congress only recently enacted a statute, 102 Stat. 4671, see 9 U. S. C. § 16 (1988 ed., Supp. IV), essentially providing for immediate appeal when a district court rejects a party’s assertion that, under the Arbitration Act, a case belongs before a commercial arbitrator and not in court, a measure predicted to have a “sweeping impact,” 15B C. Wright, A. Miller, & E. Cooper, Federal Practice and Procedure § 3914.17, p. 11 (1992); see generally id., at 7-38. That courts must give full effect to this express congressional judgment that particular policies require that private rights be vindicable immediately, however, by no means suggests that they should now be more ready to make similar judgments for themselves. Congress has expressed no parallel sentiment, to the effect that settlement-agreement rights are, as a matter of federal policy, similarly “too important” to be denied immediate review.
To be fair, the
Lauro Lines
opinion does contain language that, taken alone, might lend succor to petitioner’s claim, see
We recognize that §1292 is not a panacea, both because it depends to a degree on the indulgence of the court from which review is sought and because the discretion to decline to hear an appeal is broad, see,
e.g., Coopers & Lybrand,
