delivered the opinion of the Court.
In thе wake of successive police raids on a nightclub in Chambers County, Alabama, two of the club’s owners joined by an employee and a patron (petitioners here) sued the Chambers County Commission (respondent here), the city of Wadley, and three individual police officers. Petitioners sought damages and other relief, pursuant to 42 U. S. C. § 1988, for alleged civil rights violations. We granted certiorari to review the decision of the United States Court of Appeals for the Eleventh Circuit, which held that the Chambers County Commission qualified for summary judgment because thе sheriff who authorized the raids was a state executive officer and not an agent of the county commission. We do not reach that issue, however, because we conclude *38 that the Eleventh Circuit lacked jurisdiction to rule on the county commission’s liability at this interlocutory stage of the litigation.
The Eleventh Circuit unquestionably had jurisdiction to review the denial of the individual police officer defendants’ motions for summary judgment based on their alleged qualified immunity from suit. But the Circuit Court did not thereby gain authority to review the denial of the Chambers County Commissiоn’s motion for summary judgment. The commission’s appeal, we hold, does not fit within the “collateral order” doctrine, nor is there “pendent party” appellate authority to take up the commission’s case. We therefore vacate the relevant portion of the Eleventh Circuit’s judgment and remand the case for proceedings consistent with this opinion.
I
On December 14, 1990, and again on March 29, 1991, law enforcement officers from Chambers County and the city of Wadley, Alabama, raided the Capri Club in Chambers County as part of a narcotiсs operation. The raids were conducted without a search warrant or an arrest warrant. Petitioners filed suit, alleging, among other claims for relief, violations of their federal civil rights. Petitioners named as defendants the county commission; the city of Wadley; and three individual defendants, Chambers County Sheriff James C. Morgan, Wadley Police Chief Freddie Morgan, and Wadley Police Officer Gregory Dendinger.
The five defendants moved for summary judgment on varying grounds. The three individual defendants asserted qualified immunity from suit on petitioners’ federal claims. See
Anderson
v.
Creighton,
The United States District Court for the Middle District of Alabama denied the motions for summary judgment. The District Court agreed that § 1983 liability could not be imposed on the city for an injury inflicted by a nonpolicymaking employee; that court denied the city’s summary judgment motion, however, because the city had failed to argue that Wadley Police Chief Freddie Morgan was not its policymaker for law enforcement. Regarding the county commission’s motion, the District Court was “persuaded by the Plaintiffs that Sheriff [James C.] Morgan may have been the final decision-maker for the County in ferreting out crime, although he is a State of Alabama employee.” App. to Pet. for Cert. 67a. The District Court later denied the defendants’ motions for reconsideration, but indicated its intent to revisit, before jury deliberations, the question whether Sheriff Morgan was a policymaker for the county:
“The Chambers County Defendants correctly point out that whether Sheriff James Morgan was the final policy maker is a question of law that this Court can decide. What th[is] Court decided in its [prior order] was that the Plaintiffs had come forwаrd with sufficient evidence to persuade this Court that Sheriff Morgan may be the final policy maker for the County. The parties will have an opportunity to convince this Court that Sheriff Morgan was or was not the final policy maker *40 for the County, and the Court will make a ruling as a matter of law on that issue before the case goes to the jury.” Id., at 72a.
Invoking the rule that an order denying qualified immunity is appealable before trial,
Mitchell
v.
Forsyth,
The Eleventh Circuit affirmed in part and reversed in part the District Court’s order denying summary judgment for the individual defendants.
We granted certiorari to review the Court of Appeals’ decision that Sheriff Morgan is not a policymaker for Chambers County.
II
We inquire first whether the denial of the county commission’s summary judgment motion was appealable as a collateral order. The answer, as the Court of Appeals recognized, is a firm “No.”
By statute, federal courts of appeals have “jurisdiction of appeals from all final decisions of the district courts,” except where direct review may be had in this Court. 28 U. S. C. § 1291. “The collateral order doctrine is best understood not as an еxception to the ‘final decision’ rule laid down by Con
*42
gress in § 1291, but as a ‘practical construction’ of it.”
Digital Equipment Corp.
v.
Desktop Direct, Inc.,
The District Court planned to reconsider its ruling on the county commission’s summary judgment motion before the case went to the jury. That court had initially determined only that “Sheriff Morgan ...
may have been
the final policy maker for the County.” App. to Pet. for Cert. 67a (emphasis added). The ruling thus fails the
Cohen
test, which “disallow[s] appeal from any decision which is tentative, informal or incomplete.”
Moreover, the order denying the county commission’s summary judgment motion does not satisfy
Cohen’s
requirement that the decision be effectively unreviewable after final judgment. When we placed within the collateral order doctrine decisions denying pleas of government officials for qualified immunity, we stressed that an official’s qualified immunity is “an
immunity from suit
rather than a mere defense to liability; and like an absolute immunity, it is effectively lost if a case is erroneously permitted to go to trial.”
Mitchell,
*43
The county commission invokes our decision in
Monell,
which held that municipalities are liable under § 1983 only for violations of federal law that occur рursuant to official governmental policy or custom.
Monell,
the commission contends, should be read to accord local governments a qualified right to be free from the burdens of trial. Accordingly, the commission maintains, the commission should be able to appeal immediately the District Court’s denial of its summary judgment motion. This argument undervalues a core point we reiterated last Term: “§ 1291 requires courts of appeals to view claims of a ‘right not to be tried’ with skepticism, if not a jaundiced eye,”
Digital Equipment,
The commission’s assertion that Sheriff Morgan is not its policymaker does not rank, under our decisions, as an immunity from suit. Instead, the plea ranks as a “mere defense to liability.”
Mitchell,
Ill
Although the Court of Appeals recognized that the District Court’s order denying the county commission’s summary judgment motion was not appealable as a collateral order, the Circuit Court reviewed that ruling by assuming jurisdiction pendent to its undisputed jurisdiction to review the denial of the individual defendants’ summary judgment motions. Describing this “pendent appellate jurisdiction” as discretionary, the Eleventh Circuit concluded that judicial
*44
economy warranted its exercise in the instant case: “If thе County Commission is correct about the merits in its appeal,” the court explained, “reviewing the district court’s order would put an end to the entire case against the County____”
*45 Petitioners join respondent Chambers County Commission in urging that the Eleventh Circuit had pendent appellate jurisdiction to review, the District Court’s order denying the commission’s summary judgment motion. Both sides emphasize that § 1291’s final decision requirement is designed to prevent parties from interrupting litigation by pursuing piecemeal appeals. Once litigation has already been interrupted by аn authorized pretrial appeal, petitioners and the county commission reason, there is no cause to resist the economy that pendent appellate jurisdiction promotes. See Supplemental Brief for Petitioners 16-17; Supplemental Brief for Respondent 5, 9. Respondent county commission invites us to adopt a “‘liberafl]’” construction of § 1291, and petitioners urge an interpretation sufficiently “[practical” and “[flexible” to accommodate pendent appellate review as exercised by the Elеventh Circuit. See id., at 4; Supplemental Brief for Petitioners 14.
These arguments drift away from the statutory instructions Congress has given to control the timing of appellate proceedings. The main rule on review of “final decisions,”. § 1291, is followed by prescriptions for appeals from “interlocutory decisions,” § 1292. Section 1292(a) lists three cate *46 gories of immediately appealable interlocutory decisions. 3 Of prime significance to the jurisdictional issue before us, Congress, in 1958, augmented the §1292 catalog of immediately appealable orders; Congress added a provision, § 1292(b), according the district courts circumscribed authority to certify for immediate appeal interlocutory orders deemed pivotal and debatable. Section 1292(b) provides:
“When a district judge, in making in a civil action an order not otherwise appealable under this section, shall be of the opinion that such order involves a controlling question of law as to which there is substantial ground for difference of opinion and that an immediate appeal from the order may materially advance the ultimate termination of the litigation, he shall so state in writing in such order. The Court of Appeals which would have jurisdiction of an appeal of such action may thereupon, in its discretion, permit an appeal to be taken from such order, if application is made to it within ten days after the entry of the order: Provided, however, That application for an appeal hereunder shall not stay proceedings in the district court unless the district judge or the Court of Appeals or a judge thereof shall so order.”
*47 Congress thus chose to confer on district courts first line discretion to allow interlocutory appeals. 4 If courts of appeals had discretion to append to a Cohen-authorized appeal from a collateral order further rulings of a kind neither independently appealable nor certified by the district court, then the two-tiered arrangement § 1292(b) mandates would be severely undermined. 5
*48 Two relatively recent additions to the Judicial Code also counsel resistance to expansion of appellate jurisdiction in the manner endorsed by the Eleventh Circuit. The Rules Enabling Act, 28 U. S. C. § 2071 et seq., gives this Court “the power to prescribe general rules of practice and procеdure ... for cases in the United States district courts . . . and courts of appeals.” § 2072(a). In 1990, Congress added § 2072(c), which authorizes us to prescribe rules “defin[ing] when a ruling of a district court is final for the purposes of appeal under section 1291.” Two years later, Congress added § 1292(e), which allows us to “prescribe rules, in accordance with section 2072 ... to provide for an appeal of an interlocutory decision to the courts of appeals that is not otherwise provided for under [§ 1292] (a), (b), (c), or (d).”
Congress thus has empowered this Court to clarify whеn a decision qualifies as “final” for appellate review purposes, and to expand the list of orders appealable on an interlocutory basis. The procedure Congress ordered for such changes, however, is not expansion by court decision, but by rulemaking under § 2072. Our rulemaking authority is constrained by §§2073 and 2074, which require, among other things, that meetings of bench-bar committees established to recommend rules ordinarily be open to the public, § 2073(c)(1), and that any proposed rule be submitted to Congress before the rule takes effeсt, § 2074(a). Congress’ designation of the rulemaking process as the way to define or refine when a district court ruling is “final” and when an interlocutory order is appealable warrants the Judiciary’s full respect. 6
*49
Two decisions of this Court securely support the conclusion that the Eleventh Circuit lacked jurisdiction instantly to review the denial of the county commission’s summary judgment motion:
Abney
v.
United States,
“Our conclusion that a defendant may seek immediate appellate review of a district court’s rejection of his double jeopardy claim is based on the special considerations permeating claims of that nature which justify a departure from the normal rule of finality. Quite obviously, such considerations do not extend beyond the claim of formal jeopardy and encompass other claims presented to, and rejected by, the district court in passing on the accused’s motion to dismiss. Rather, such claims are appealable if, and only if, they too fall within Cohen’s collateral-order exception to the final-judgment rule. Any other rule would encourage criminal defendants to seek review of, or assert, frivolous double jeopardy claims in order to bring more serious, but otherwise nonappealable questions to the attention of the courts of appeals prior to conviсtion and sentence.” Id., at 663 (citation omitted).
Petitioners suggest that Abney should control in criminal cases only. Supplemental Brief for Petitioners 11. But the concern expressed in Abney — that a rule loosely allowing pendent appellate jurisdiction would encourage parties to *50 parlay Cohen-type collateral orders into multi-issue interlocutory appeal tickets — bears on civil cases as well.
In
Stanley,
we similarly refused to allow expansion of the scope of an interlocutory appeal. That civil case involved an order certified by the trial court, and accepted by the аppellate court, for immediate review pursuant to § 1292(b). Immediate appellate review, we held, was limited to the certified order; issues presented by other, noncertified orders could not be considered simultaneously.
The parties are correct that we have not universally required courts of appeals to confine review to the precise decision independently subject to appeal. See,
e. g., Thornburgh
v.
American College of Obstetricians and Gynecologists,
We need not definitively or preemptively settle here whether or when it may be proper for a court of appeals, with jurisdiction over one ruling, to review, conjunctively, *51 related rulings that are not themselves independently appealable. See supra, at 48 (describing provisions by Congress for rulemaking regarding appeals prior to the district court’s final disposition of entire case). The parties dо not contend that the District Court’s decision to deny the Chambers County Commission’s summary judgment motion was inextricably intertwined with that court’s decision to deny the individual defendants’ qualified immunity motions, or that review of the former decision was necessary to ensure meaningful review of the latter. Cf. Kanji, The Proper Scope of Pendent Appellate Jurisdiction in the Collateral Order Context, 100 Yale L. J. 511, 530 (1990) (“Only where essential to the resolution of properly appealed collateral orders should courts extend their Cohen jurisdiction to rulings that would not otherwise qualify for expedited consideration.”). Nor could the parties so argue. The individual defendants’ qualified immunity turns on whether they violated clearly established federal law; the county commission’s liability turns on the allocation of law enforcement power in Alabama.
* * *
The Eleventh Circuit’s authority immediately to review the District Court’s denial of the individual police officer defendants’ summary judgment motions did not include authority to review at once the unrelated question of the county commission’s liability. The District Court’s preliminary ruling regarding the county did not qualify as a “cоllateral order,” and there is no “pendent party” appellate jurisdiction of the kind the Eleventh Circuit purported to exercise. We therefore vacate the relevant portion of the Eleventh Circuit’s judgment and remand the case for proceedings consistent with this opinion.
It is so ordered.
Notes
On Sheriff James C. Morgan’s suggestion for rehearing en banc, the Eleventh Circuit modified its opinion with respect to an issue not relevant here and denied rehearing en banc.
The Federal Courts of Appeals have endorsed the doctrine of pendent appellate jurisdiction, although they have expressed varying views about when such jurisdiction is properly exercised. See,
e. g., Roque-Rodriguez
v.
Lema Moya,
Section 1292(a) provides in relevant part:
“[T]he courts of appeals shall have jurisdiсtion of appeals from:
“(1) Interlocutory orders of the district courts ... granting, continuing, modifying, refusing or dissolving injunctions, or refusing to dissolve or modify injunctions, except where a direct review may be had in the Supreme Court;
“(2) Interlocutory orders appointing receivers, or refusing orders to wind up receiverships or to take steps to accomplish the purposes thereof, such as directing sales or other disposals of property;
“(3) Interlocutory decrees of such district courts or the judges thereof determining the rights and liabilities of the pаrties to admiralty cases in which appeals from final decrees are allowed.”
When it passed § 1292(b), Congress had before it a proposal, by Jerome Frank of the Court of Appeals for the Second Circuit, to give the courts of appeals sole discretion to allow interlocutory appeals. Judge Frank had opposed making interlocutory appeal contingent upon procurement of a certificate from the district judge; he advanced instead the following proposal:
“ ‘It shall be the duty of the district judge to state in writing whether in his opinion the appeal is warranted; this statement shall be appended to the petition for appeal or, as promptly as possible after the filing of such petition in the court of appeals, shall be forwarded to said court by the district judge. The court of appeals shall take into account, but shall not be bound by, such statement in exercising its discretion.’” Undated letter from study committee to the Tenth Circuit Judicial Conference, in S. Rep. No. 2434, 85th Cong., 2d Sess., 8-9 (1958).
This case indicates how the initial discretion Congress lodged in district courts under § 1292(b) could be circumvented by the “liberal” or “flexible” approach petitioners and respondent prefer. The District Court here ruled only tentatively on the county commission’s motion and apparently contemplated receipt of further evidence from the parties before ruling definitively. See order denying motions to reconsider, App. to Pet. for Cert. 72a (“The parties will have an opportunity to convince this Court that Sheriff Morgan was or was not the final policy maker for the County, and the Court will make a ruling as a matter of law on that issue before the case goes to the jury.”); cf.
Swint
v.
Wadley,
In the instant case, the Eleventh Circuit asserted not merely pendent appellate jurisdiction, but pendent party appellate jurisdiction: The court appended to its jurisdiction to review the denial of the individual defendants’ qualified immunity motions jurisdiction to review the denial of the commission’s summary judgment motion. We note that in 1990, Congress endeavored to clarify and codify instances appropriate for the exercise of pendent or “supplemental” jurisdiction in district courts. 28 U. S. C. § 1367 (1988 ed., Supp. V); see § 1367(a) (providing for “supplemen *49 tal jurisdiction” over “claims that involve the joinder or intervention of additional parties”).
