diff --git a/packages/core/src/evaluator.js b/packages/core/src/evaluator.js
new file mode 100644
index 0000000..0bc3a63
--- /dev/null
+++ b/packages/core/src/evaluator.js
@@ -0,0 +1,441 @@
+// Evaluator for Nostr Governance
+//
+// This module brings together all the core components to evaluate governance
+// decisions for targets based on state and policies.
+
+import { getTargetKey } from "./identifiers.js";
+import { areTargetsEqual, isDescendantOf } from "./targets.js";
+import { hasCapability } from "./authority.js";
+import {
+  createGovernanceDecision,
+  getPolicyEffect,
+  composeGovernanceDecisions
+} from "./policy.js";
+
+/**
+ * @typedef {import('./identifiers.js').GovernanceTarget} GovernanceTarget
+ * @typedef {import('./authority.js').AuthorityState} AuthorityState
+ * @typedef {import('./policy.js').PolicyContext} PolicyContext
+ * @typedef {import('./policy.js').GovernanceDecision} GovernanceDecision
+ * @typedef {import('./policy.js').PolicyDefinition} PolicyDefinition
+ */
+
+/**
+ * @typedef {Object} Report
+ * @property {string} reporter - Pubkey of the reporter
+ * @property {GovernanceTarget} target - Target being reported
+ * @property {string} category - Report category
+ * @property {number} timestamp - Unix timestamp of the report
+ */
+
+/**
+ * @typedef {Object} TrustedMute
+ * @property {GovernanceTarget} target - Target being muted
+ * @property {number} count - Number of trusted mutes
+ * @property {Record<string, number>} categories - Count of mutes per category
+ */
+
+/**
+ * @typedef {Object} Override
+ * @property {GovernanceTarget} target - Target being overridden
+ * @property {"allow"|"restrict"|"hide"|"deny"} visibility - Visibility override
+ * @property {string} [reason] - Reason for the override
+ */
+
+/**
+ * @typedef {Object} GovernanceState
+ * @property {AuthorityState} authority - Authority state
+ * @property {Record<string, Report[]>} reports - Reports by target key
+ * @property {Record<string, TrustedMute>} trustedMutes - Trusted mutes by target key
+ * @property {Record<string, Override>} overrides - Overrides by target key
+ * @property {Record<string, PolicyDefinition>} policies - Policy definitions by ID
+ */
+
+/**
+ * Default thresholds for governance decisions
+ */
+export const DEFAULT_THRESHOLDS = {
+  // Number of trusted reports needed to hide a target
+  trustedReportHideThreshold: 5,
+  // Number of trusted reports needed to restrict a target
+  trustedReportRestrictThreshold: 3,
+  // Number of trusted mutes needed to hide a target
+  trustedMuteHideThreshold: 10,
+  // Number of trusted mutes needed to restrict a target
+  trustedMuteRestrictThreshold: 5
+};
+
+/**
+ * Evaluate a single target against the governance state
+ * @param {GovernanceTarget} target
+ * @param {GovernanceState} state
+ * @param {PolicyContext} context
+ * @param {string} [viewerPubkey] - Pubkey of the viewer (for personal overrides)
+ * @returns {GovernanceDecision}
+ */
+export function evaluateTarget(target, state, context, viewerPubkey) {
+  const decisions = [];
+  
+  // 1. Check for personal overrides first
+  if (viewerPubkey) {
+    const overrideDecision = checkPersonalOverrides(target, state, viewerPubkey);
+    if (overrideDecision) {
+      decisions.push(overrideDecision);
+    }
+  }
+  
+  // 2. Check for explicit overrides
+  const explicitOverrideDecision = checkExplicitOverrides(target, state, context);
+  if (explicitOverrideDecision) {
+    decisions.push(explicitOverrideDecision);
+  }
+  
+  // 3. Check reports
+  const reportDecision = checkReports(target, state, context);
+  if (reportDecision) {
+    decisions.push(reportDecision);
+  }
+  
+  // 4. Check trusted mutes
+  const muteDecision = checkTrustedMutes(target, state, context);
+  if (muteDecision) {
+    decisions.push(muteDecision);
+  }
+  
+  // 5. Check if target is a descendant of a denied ancestor
+  const ancestorDecision = checkAncestorDeny(target, state, context);
+  if (ancestorDecision) {
+    decisions.push(ancestorDecision);
+  }
+  
+  // Compose all decisions into a final decision
+  if (decisions.length === 0) {
+    // Default allow decision
+    return createGovernanceDecision(
+      { effect: /** @type {import('./policy.js').PolicyEffect["effect"]} */ ("allow") },
+      { effect: /** @type {import('./policy.js').PolicyEffect["effect"]} */ ("allow") }
+    );
+  }
+  
+  return composeGovernanceDecisions(decisions);
+}
+
+/**
+ * Check for personal overrides for a viewer
+ * @param {GovernanceTarget} target
+ * @param {GovernanceState} state
+ * @param {string} viewerPubkey
+ * @returns {GovernanceDecision|null}
+ */
+function checkPersonalOverrides(target, state, viewerPubkey) {
+  // This would check for personal allowlists, blocklists, etc.
+  // For now, we'll return null to indicate no personal override
+  return null;
+}
+
+/**
+ * Check for explicit overrides
+ * @param {GovernanceTarget} target
+ * @param {GovernanceState} state
+ * @param {PolicyContext} context
+ * @returns {GovernanceDecision|null}
+ */
+function checkExplicitOverrides(target, state, context) {
+  const targetKey = getTargetKey(target);
+  const override = state.overrides[targetKey];
+  
+  if (!override) {
+    return null;
+  }
+  
+  // Check if the override should be applied based on context
+  if (context.enforcement && context.enforcement.allowOverrides === false) {
+    return null;
+  }
+  
+  const reasons = [];
+  if (override.reason) {
+    reasons.push(override.reason);
+  }
+  
+  return createGovernanceDecision(
+    { 
+      effect: /** @type {import('./policy.js').PolicyEffect["effect"]} */ (override.visibility), 
+      reason: override.reason 
+    },
+    { 
+      effect: /** @type {import('./policy.js').PolicyEffect["effect"]} */ (override.visibility), 
+      reason: override.reason 
+    },
+    undefined,
+    reasons,
+    [override]
+  );
+}
+
+/**
+ * Check reports against a target
+ * @param {GovernanceTarget} target
+ * @param {GovernanceState} state
+ * @param {PolicyContext} context
+ * @returns {GovernanceDecision|null}
+ */
+function checkReports(target, state, context) {
+  const targetKey = getTargetKey(target);
+  const targetReports = state.reports[targetKey] || [];
+  
+  if (targetReports.length === 0) {
+    return null;
+  }
+  
+  // Count trusted reports by category
+  /** @type {Record<string, number>} */
+  const trustedReportCounts = {};
+  /** @type {any[]} */
+  const evidence = [];
+  
+  for (const report of targetReports) {
+    // Check if the reporter is trusted
+    if (hasCapability(report.reporter, "submit-reports", state.authority)) {
+      if (!trustedReportCounts[report.category]) {
+        trustedReportCounts[report.category] = 0;
+      }
+      trustedReportCounts[report.category]++;
+      evidence.push(report);
+    }
+  }
+  
+  // Determine effect based on trusted report counts
+  let visibilityEffect = /** @type {import('./policy.js').PolicyEffect["effect"]} */ ("allow");
+  let interactionEffect = /** @type {import('./policy.js').PolicyEffect["effect"]} */ ("allow");
+  /** @type {string[]} */
+  const reasons = [];
+  
+  for (const [category, count] of Object.entries(trustedReportCounts)) {
+    if (count >= DEFAULT_THRESHOLDS.trustedReportHideThreshold) {
+      visibilityEffect = /** @type {import('./policy.js').PolicyEffect["effect"]} */ ("hide");
+      interactionEffect = /** @type {import('./policy.js').PolicyEffect["effect"]} */ ("deny");
+      reasons.push(`Hidden due to ${count} trusted reports in category ${category}`);
+    } else if (count >= DEFAULT_THRESHOLDS.trustedReportRestrictThreshold) {
+      visibilityEffect = /** @type {import('./policy.js').PolicyEffect["effect"]} */ ("restrict");
+      reasons.push(`Restricted due to ${count} trusted reports in category ${category}`);
+    }
+  }
+  
+  if (visibilityEffect === "allow" && interactionEffect === "allow") {
+    return null;
+  }
+  
+  return createGovernanceDecision(
+    { effect: visibilityEffect, reason: reasons.join("; ") },
+    { effect: interactionEffect, reason: reasons.join("; ") },
+    undefined,
+    reasons,
+    evidence
+  );
+}
+
+/**
+ * Check trusted mutes against a target
+ * @param {GovernanceTarget} target
+ * @param {GovernanceState} state
+ * @param {PolicyContext} context
+ * @returns {GovernanceDecision|null}
+ */
+function checkTrustedMutes(target, state, context) {
+  const targetKey = getTargetKey(target);
+  const trustedMute = state.trustedMutes[targetKey];
+  
+  if (!trustedMute) {
+    return null;
+  }
+  
+  // Determine effect based on trusted mute count
+  let visibilityEffect = /** @type {import('./policy.js').PolicyEffect["effect"]} */ ("allow");
+  let interactionEffect = /** @type {import('./policy.js').PolicyEffect["effect"]} */ ("allow");
+  /** @type {string[]} */
+  const reasons = [];
+  const evidence = [trustedMute];
+  
+  if (trustedMute.count >= DEFAULT_THRESHOLDS.trustedMuteHideThreshold) {
+    visibilityEffect = /** @type {import('./policy.js').PolicyEffect["effect"]} */ ("hide");
+    interactionEffect = /** @type {import('./policy.js').PolicyEffect["effect"]} */ ("deny");
+    reasons.push(`Hidden due to ${trustedMute.count} trusted mutes`);
+  } else if (trustedMute.count >= DEFAULT_THRESHOLDS.trustedMuteRestrictThreshold) {
+    visibilityEffect = /** @type {import('./policy.js').PolicyEffect["effect"]} */ ("restrict");
+    reasons.push(`Restricted due to ${trustedMute.count} trusted mutes`);
+  }
+  
+  if (visibilityEffect === "allow" && interactionEffect === "allow") {
+    return null;
+  }
+  
+  return createGovernanceDecision(
+    { effect: visibilityEffect, reason: reasons.join("; ") },
+    { effect: interactionEffect, reason: reasons.join("; ") },
+    undefined,
+    reasons,
+    evidence
+  );
+}
+
+/**
+ * Check if target is a descendant of a denied ancestor
+ * @param {GovernanceTarget} target
+ * @param {GovernanceState} state
+ * @param {PolicyContext} context
+ * @returns {GovernanceDecision|null}
+ */
+function checkAncestorDeny(target, state, context) {
+  // This would check if any ancestor of the target is denied
+  // For now, we'll return null to indicate no ancestor deny
+  return null;
+}
+
+/**
+ * Evaluate multiple targets against the governance state
+ * @param {GovernanceTarget[]} targets
+ * @param {GovernanceState} state
+ * @param {PolicyContext} context
+ * @param {string} [viewerPubkey] - Pubkey of the viewer (for personal overrides)
+ * @returns {Record<string, GovernanceDecision>}
+ */
+export function evaluateMany(targets, state, context, viewerPubkey) {
+  /** @type {Record<string, GovernanceDecision>} */
+  const results = {};
+  
+  for (const target of targets) {
+    const targetKey = getTargetKey(target);
+    results[targetKey] = evaluateTarget(target, state, context, viewerPubkey);
+  }
+  
+  return results;
+}
+
+/**
+ * Create a governance state
+ * @param {AuthorityState} [authority]
+ * @param {Record<string, Report[]>} [reports]
+ * @param {Record<string, TrustedMute>} [trustedMutes]
+ * @param {Record<string, Override>} [overrides]
+ * @param {Record<string, PolicyDefinition>} [policies]
+ * @returns {GovernanceState}
+ */
+export function createGovernanceState(authority, reports, trustedMutes, overrides, policies) {
+  return {
+    authority: authority || { roles: {}, actors: {} },
+    reports: reports || {},
+    trustedMutes: trustedMutes || {},
+    overrides: overrides || {},
+    policies: policies || {}
+  };
+}
+
+/**
+ * Create a report
+ * @param {string} reporter
+ * @param {GovernanceTarget} target
+ * @param {string} category
+ * @param {number} timestamp
+ * @returns {Report}
+ */
+export function createReport(reporter, target, category, timestamp) {
+  // Validate reporter pubkey
+  if (typeof reporter !== "string" || !/^[0-9a-f]{64}$/i.test(reporter)) {
+    throw new Error("Reporter must be a 64-character hex pubkey");
+  }
+  
+  // Validate target
+  if (!target || typeof target !== "object") {
+    throw new Error("Target must be an object");
+  }
+  
+  // Validate category
+  if (typeof category !== "string" || !category.trim()) {
+    throw new Error("Category must be a non-empty string");
+  }
+  
+  // Validate timestamp
+  if (typeof timestamp !== "number" || timestamp <= 0) {
+    throw new Error("Timestamp must be a positive number");
+  }
+  
+  return {
+    reporter: reporter.toLowerCase(),
+    target,
+    category: category.trim(),
+    timestamp
+  };
+}
+
+/**
+ * Create a trusted mute
+ * @param {GovernanceTarget} target
+ * @param {number} count
+ * @param {Record<string, number>} categories
+ * @returns {TrustedMute}
+ */
+export function createTrustedMute(target, count, categories) {
+  // Validate target
+  if (!target || typeof target !== "object") {
+    throw new Error("Target must be an object");
+  }
+  
+  // Validate count
+  if (typeof count !== "number" || count < 0) {
+    throw new Error("Count must be a non-negative number");
+  }
+  
+  // Validate categories
+  if (!categories || typeof categories !== "object") {
+    throw new Error("Categories must be an object");
+  }
+  
+  // Validate each category count
+  for (const [category, categoryCount] of Object.entries(categories)) {
+    if (typeof category !== "string" || !category.trim()) {
+      throw new Error("Category names must be non-empty strings");
+    }
+    
+    if (typeof categoryCount !== "number" || categoryCount < 0) {
+      throw new Error("Category counts must be non-negative numbers");
+    }
+  }
+  
+  return {
+    target,
+    count,
+    categories
+  };
+}
+
+/**
+ * Create an override
+ * @param {GovernanceTarget} target
+ * @param {"allow"|"restrict"|"hide"|"deny"} visibility
+ * @param {string} [reason]
+ * @returns {Override}
+ */
+export function createOverride(target, visibility, reason) {
+  // Validate target
+  if (!target || typeof target !== "object") {
+    throw new Error("Target must be an object");
+  }
+  
+  // Validate visibility
+  if (!["allow", "restrict", "hide", "deny"].includes(visibility)) {
+    throw new Error("Invalid visibility effect");
+  }
+  
+  /** @type {Override} */
+  const override = {
+    target,
+    visibility
+  };
+  
+  if (reason) {
+    override.reason = reason;
+  }
+  
+  return override;
+}
\ No newline at end of file
diff --git a/packages/core/test/evaluator.test.js b/packages/core/test/evaluator.test.js
new file mode 100644
index 0000000..950693e
--- /dev/null
+++ b/packages/core/test/evaluator.test.js
@@ -0,0 +1,369 @@
+import { describe, it, expect } from "vitest";
+import {
+  evaluateTarget,
+  evaluateMany,
+  createGovernanceState,
+  createReport,
+  createTrustedMute,
+  createOverride,
+  DEFAULT_THRESHOLDS
+} from "../src/evaluator.js";
+import {
+  createUserTarget,
+  createEventTarget
+} from "../src/identifiers.js";
+import {
+  createAuthorityState,
+  createActor
+} from "../src/authority.js";
+import {
+  createPolicyContext
+} from "../src/policy.js";
+
+describe("evaluator", () => {
+  describe("evaluateTarget", () => {
+    it("should return default allow decision for target with no reports or mutes", () => {
+      const target = createUserTarget("abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      const state = createGovernanceState();
+      const context = createPolicyContext("feed", "default");
+      
+      const decision = evaluateTarget(target, state, context);
+      expect(decision).toEqual({
+        visibility: { effect: "allow" },
+        interaction: { effect: "allow" },
+        reasons: [],
+        evidence: []
+      });
+    });
+
+    it("should hide target with sufficient trusted reports", () => {
+      const target = createUserTarget("abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      const reporter = "1234567890123456789012345678901234567890123456789012345678901234";
+      
+      // Create authority state with reporter as moderator (can submit reports)
+      const authorityState = createAuthorityState({}, {
+        [reporter]: createActor(reporter, ["moderator"])
+      });
+      
+      const state = createGovernanceState(
+        authorityState,
+        {
+          "user:abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789": [
+            createReport(reporter, target, "spam", Date.now())
+          ]
+        }
+      );
+      
+      const context = createPolicyContext("feed", "default");
+      
+      // Add enough reports to exceed the hide threshold
+      for (let i = 0; i < DEFAULT_THRESHOLDS.trustedReportHideThreshold; i++) {
+        state.reports["user:abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789"].push(
+          createReport(reporter, target, "spam", Date.now() + i)
+        );
+      }
+      
+      const decision = evaluateTarget(target, state, context);
+      expect(decision.visibility.effect).toBe("hide");
+      expect(decision.interaction.effect).toBe("deny");
+    });
+
+    it("should restrict target with moderate number of trusted reports", () => {
+      const target = createUserTarget("abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      const reporter = "1234567890123456789012345678901234567890123456789012345678901234";
+      
+      // Create authority state with reporter as moderator (can submit reports)
+      const authorityState = createAuthorityState({}, {
+        [reporter]: createActor(reporter, ["moderator"])
+      });
+      
+      const state = createGovernanceState(
+        authorityState,
+        {
+          "user:abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789": [
+            createReport(reporter, target, "spam", Date.now())
+          ]
+        }
+      );
+      
+      const context = createPolicyContext("feed", "default");
+      
+      // Add enough reports to exceed the restrict threshold but not the hide threshold
+      for (let i = 0; i < DEFAULT_THRESHOLDS.trustedReportRestrictThreshold; i++) {
+        state.reports["user:abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789"].push(
+          createReport(reporter, target, "spam", Date.now() + i)
+        );
+      }
+      
+      const decision = evaluateTarget(target, state, context);
+      expect(decision.visibility.effect).toBe("restrict");
+      expect(decision.interaction.effect).toBe("allow");
+    });
+
+    it("should hide target with sufficient trusted mutes", () => {
+      const target = createUserTarget("abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      
+      const state = createGovernanceState(
+        undefined,
+        undefined,
+        {
+          "user:abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789": 
+            createTrustedMute(target, DEFAULT_THRESHOLDS.trustedMuteHideThreshold, {
+              "mute": DEFAULT_THRESHOLDS.trustedMuteHideThreshold
+            })
+        }
+      );
+      
+      const context = createPolicyContext("feed", "default");
+      
+      const decision = evaluateTarget(target, state, context);
+      expect(decision.visibility.effect).toBe("hide");
+      expect(decision.interaction.effect).toBe("deny");
+    });
+
+    it("should restrict target with moderate number of trusted mutes", () => {
+      const target = createUserTarget("abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      
+      const state = createGovernanceState(
+        undefined,
+        undefined,
+        {
+          "user:abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789": 
+            createTrustedMute(target, DEFAULT_THRESHOLDS.trustedMuteRestrictThreshold, {
+              "mute": DEFAULT_THRESHOLDS.trustedMuteRestrictThreshold
+            })
+        }
+      );
+      
+      const context = createPolicyContext("feed", "default");
+      
+      const decision = evaluateTarget(target, state, context);
+      expect(decision.visibility.effect).toBe("restrict");
+      expect(decision.interaction.effect).toBe("allow");
+    });
+
+    it("should apply explicit overrides", () => {
+      const target = createUserTarget("abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      
+      const state = createGovernanceState(
+        undefined,
+        undefined,
+        undefined,
+        {
+          "user:abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789": 
+            createOverride(target, "hide", "Administrative override")
+        }
+      );
+      
+      const context = createPolicyContext("feed", "default");
+      
+      const decision = evaluateTarget(target, state, context);
+      expect(decision.visibility.effect).toBe("hide");
+      expect(decision.interaction.effect).toBe("hide");
+      expect(decision.reasons).toContain("Administrative override");
+    });
+
+    it("should ignore overrides when enforcement disallows them", () => {
+      const target = createUserTarget("abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      
+      const state = createGovernanceState(
+        undefined,
+        undefined,
+        undefined,
+        {
+          "user:abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789": 
+            createOverride(target, "hide", "Administrative override")
+        }
+      );
+      
+      const context = createPolicyContext("feed", "default", {
+        allowOverrides: false
+      });
+      
+      const decision = evaluateTarget(target, state, context);
+      expect(decision.visibility.effect).toBe("allow");
+      expect(decision.interaction.effect).toBe("allow");
+    });
+  });
+
+  describe("evaluateMany", () => {
+    it("should evaluate multiple targets", () => {
+      const target1 = createUserTarget("abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      const target2 = createEventTarget("1234567890123456789012345678901234567890123456789012345678901234");
+      
+      const state = createGovernanceState();
+      const context = createPolicyContext("feed", "default");
+      
+      const results = evaluateMany([target1, target2], state, context);
+      
+      expect(results).toHaveProperty("user:abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      expect(results).toHaveProperty("event:1234567890123456789012345678901234567890123456789012345678901234");
+      
+      expect(results["user:abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789"]).toEqual({
+        visibility: { effect: "allow" },
+        interaction: { effect: "allow" },
+        reasons: [],
+        evidence: []
+      });
+      
+      expect(results["event:1234567890123456789012345678901234567890123456789012345678901234"]).toEqual({
+        visibility: { effect: "allow" },
+        interaction: { effect: "allow" },
+        reasons: [],
+        evidence: []
+      });
+    });
+  });
+
+  describe("createGovernanceState", () => {
+    it("should create a valid governance state", () => {
+      const authority = createAuthorityState();
+      const reports = {};
+      const trustedMutes = {};
+      const overrides = {};
+      const policies = {};
+      
+      const state = createGovernanceState(authority, reports, trustedMutes, overrides, policies);
+      expect(state).toEqual({
+        authority,
+        reports,
+        trustedMutes,
+        overrides,
+        policies
+      });
+    });
+
+    it("should create a governance state with default empty objects", () => {
+      const state = createGovernanceState();
+      expect(state).toEqual({
+        authority: { roles: {}, actors: {} },
+        reports: {},
+        trustedMutes: {},
+        overrides: {},
+        policies: {}
+      });
+    });
+  });
+
+  describe("createReport", () => {
+    it("should create a valid report", () => {
+      const target = createUserTarget("abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      const report = createReport(
+        "1234567890123456789012345678901234567890123456789012345678901234",
+        target,
+        "spam",
+        Date.now()
+      );
+      
+      expect(report).toEqual({
+        reporter: "1234567890123456789012345678901234567890123456789012345678901234",
+        target,
+        category: "spam",
+        timestamp: expect.any(Number)
+      });
+    });
+
+    it("should throw error for invalid reporter", () => {
+      const target = createUserTarget("abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      expect(() => createReport("invalid", target, "spam", Date.now())).toThrow();
+    });
+
+    it("should throw error for invalid target", () => {
+      expect(() => createReport(
+        "1234567890123456789012345678901234567890123456789012345678901234",
+        null,
+        "spam",
+        Date.now()
+      )).toThrow();
+    });
+
+    it("should throw error for invalid category", () => {
+      const target = createUserTarget("abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      expect(() => createReport(
+        "1234567890123456789012345678901234567890123456789012345678901234",
+        target,
+        "",
+        Date.now()
+      )).toThrow();
+    });
+
+    it("should throw error for invalid timestamp", () => {
+      const target = createUserTarget("abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      expect(() => createReport(
+        "1234567890123456789012345678901234567890123456789012345678901234",
+        target,
+        "spam",
+        -1
+      )).toThrow();
+    });
+  });
+
+  describe("createTrustedMute", () => {
+    it("should create a valid trusted mute", () => {
+      const target = createUserTarget("abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      const trustedMute = createTrustedMute(target, 5, { "mute": 5 });
+      
+      expect(trustedMute).toEqual({
+        target,
+        count: 5,
+        categories: { "mute": 5 }
+      });
+    });
+
+    it("should throw error for invalid target", () => {
+      expect(() => createTrustedMute(null, 5, { "mute": 5 })).toThrow();
+    });
+
+    it("should throw error for invalid count", () => {
+      const target = createUserTarget("abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      expect(() => createTrustedMute(target, -1, { "mute": 5 })).toThrow();
+    });
+
+    it("should throw error for invalid categories", () => {
+      const target = createUserTarget("abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      expect(() => createTrustedMute(target, 5, null)).toThrow();
+    });
+
+    it("should throw error for invalid category names", () => {
+      const target = createUserTarget("abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      expect(() => createTrustedMute(target, 5, { "": 5 })).toThrow();
+    });
+
+    it("should throw error for invalid category counts", () => {
+      const target = createUserTarget("abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      expect(() => createTrustedMute(target, 5, { "mute": -1 })).toThrow();
+    });
+  });
+
+  describe("createOverride", () => {
+    it("should create a valid override", () => {
+      const target = createUserTarget("abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      const override = createOverride(target, "hide", "Administrative override");
+      
+      expect(override).toEqual({
+        target,
+        visibility: "hide",
+        reason: "Administrative override"
+      });
+    });
+
+    it("should create an override without reason", () => {
+      const target = createUserTarget("abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      const override = createOverride(target, "hide");
+      
+      expect(override).toEqual({
+        target,
+        visibility: "hide"
+      });
+    });
+
+    it("should throw error for invalid target", () => {
+      expect(() => createOverride(null, "hide")).toThrow();
+    });
+
+    it("should throw error for invalid visibility", () => {
+      const target = createUserTarget("abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789");
+      expect(() => createOverride(target, /** @type {any} */ ("invalid"))).toThrow();
+    });
+  });
+});
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