diff --git a/server/src/__tests__/helpers/fake-github-transport.ts b/server/src/__tests__/helpers/fake-github-transport.ts
new file mode 100644
index 00000000000..4fb6013aea4
--- /dev/null
+++ b/server/src/__tests__/helpers/fake-github-transport.ts
@@ -0,0 +1,108 @@
+import type {
+  GitHubAppTransport,
+  GitHubInstallation,
+  GitHubInstallationToken,
+  GitHubRepository,
+} from "../../services/repository-providers/github-provider.js";
+
+/**
+ * Controllable in-memory GitHub App transport for provider tests. It stands in
+ * for GitHub's HTTP API + App JWT/installation-token exchange so the GitHub.com
+ * provider's own logic (state, discovery, pagination, snapshot mapping,
+ * rename/transfer convergence, credential resolution) can be exercised without
+ * a live GitHub. No real app private key is involved.
+ */
+export class FakeGitHubTransport implements GitHubAppTransport {
+  readonly host = "github.com";
+  readonly apiBaseUrl = "https://api.github.com";
+  private readonly installations = new Map<string, GitHubInstallation>();
+  private readonly repositories = new Map<string, GitHubRepository[]>();
+  private tokenCounter = 0;
+  private clock: () => Date;
+  tokenTtlMs = 60 * 60 * 1000;
+  /** Set to force token minting to fail (e.g. revoked installation). */
+  failTokenMint: Error | null = null;
+
+  constructor(clock: () => Date = () => new Date()) {
+    this.clock = clock;
+  }
+
+  setInstallation(installation: GitHubInstallation, repositories: GitHubRepository[]) {
+    this.installations.set(String(installation.id), installation);
+    this.repositories.set(String(installation.id), [...repositories]);
+  }
+
+  setRepositories(installationId: string, repositories: GitHubRepository[]) {
+    this.repositories.set(installationId, [...repositories]);
+  }
+
+  rename(installationId: string, providerRepositoryId: string, next: { owner: string; name: string }) {
+    const repos = this.repositories.get(installationId) ?? [];
+    const repo = repos.find((r) => String(r.id) === providerRepositoryId);
+    if (!repo) throw new Error(`fake github repo ${providerRepositoryId} not found`);
+    repo.owner = { ...repo.owner, login: next.owner };
+    repo.name = next.name;
+    repo.full_name = `${next.owner}/${next.name}`;
+    repo.clone_url = `https://github.com/${next.owner}/${next.name}.git`;
+    repo.html_url = `https://github.com/${next.owner}/${next.name}`;
+  }
+
+  async getInstallation(installationId: string): Promise<GitHubInstallation | null> {
+    return this.installations.get(installationId) ?? null;
+  }
+
+  async createInstallationAccessToken(installationId: string): Promise<GitHubInstallationToken> {
+    if (this.failTokenMint) throw this.failTokenMint;
+    if (!this.installations.has(installationId)) throw new Error("installation not found");
+    this.tokenCounter += 1;
+    return {
+      token: `ghs_faketoken${this.tokenCounter}`,
+      expiresAt: new Date(this.clock().getTime() + this.tokenTtlMs),
+    };
+  }
+
+  async listRepositories(input: {
+    installationId: string;
+    page: number;
+    perPage: number;
+    query?: string | null;
+  }): Promise<{ totalCount: number | null; items: GitHubRepository[] }> {
+    const repos = this.repositories.get(input.installationId) ?? [];
+    const query = input.query?.trim().toLowerCase();
+    const matches = query
+      ? repos.filter((r) => r.full_name.toLowerCase().includes(query))
+      : repos;
+    const start = (input.page - 1) * input.perPage;
+    return {
+      totalCount: matches.length,
+      items: matches.slice(start, start + input.perPage),
+    };
+  }
+
+  async getRepository(input: {
+    installationId: string;
+    providerRepositoryId: string;
+  }): Promise<GitHubRepository | null> {
+    const repos = this.repositories.get(input.installationId) ?? [];
+    return repos.find((r) => String(r.id) === input.providerRepositoryId) ?? null;
+  }
+}
+
+export function makeGitHubRepository(overrides: Partial<GitHubRepository> & { id: number | string; owner: string; name: string }): GitHubRepository {
+  const owner = overrides.owner;
+  const name = overrides.name;
+  return {
+    id: overrides.id,
+    name,
+    full_name: `${owner}/${name}`,
+    owner: { login: owner, id: overrides.id, type: "Organization" },
+    clone_url: `https://github.com/${owner}/${name}.git`,
+    html_url: `https://github.com/${owner}/${name}`,
+    default_branch: "main",
+    private: true,
+    visibility: "private",
+    archived: false,
+    fork: false,
+    ...overrides,
+  };
+}
diff --git a/server/src/__tests__/helpers/repository-provider-conformance.ts b/server/src/__tests__/helpers/repository-provider-conformance.ts
new file mode 100644
index 00000000000..c2dbc2d6f81
--- /dev/null
+++ b/server/src/__tests__/helpers/repository-provider-conformance.ts
@@ -0,0 +1,191 @@
+import { randomUUID } from "node:crypto";
+import { expect, it } from "vitest";
+import type { RepositoryConnection } from "@paperclipai/shared";
+import type { RepositoryProviderConnector } from "../../services/repository-providers/provider-contract.js";
+
+/**
+ * Reusable provider conformance harness. Any {@link RepositoryProviderConnector}
+ * implementation — the in-memory fake or the real GitHub.com provider backed by
+ * a fake transport — must pass this suite. It asserts installation lifecycle,
+ * signed-state validation, searchable/paginated discovery, metadata refresh,
+ * rename/transfer convergence via sync, and short-lived clone credential
+ * resolution (secret-free audit).
+ */
+
+export interface ConformanceSeedRepo {
+  providerRepositoryId: string;
+  owner: string;
+  name: string;
+}
+
+export interface ProviderConformanceWorld {
+  connector: RepositoryProviderConnector;
+  companyId: string;
+  userId: string;
+  installationId: string;
+  accountName: string;
+  /** Replace the repository set visible to the installation. */
+  seed(repos: ConformanceSeedRepo[]): void;
+  /** Rename/transfer a repo, keeping its provider id stable. */
+  rename(providerRepositoryId: string, next: { owner: string; name: string }): void;
+}
+
+export type ConformanceWorldFactory = () => ProviderConformanceWorld;
+
+function connectionFromMetadata(
+  world: ProviderConformanceWorld,
+  meta: { installationId: string; accountId: string | null; accountName: string | null; host: string; providerMetadata: Record<string, unknown> | null },
+): RepositoryConnection {
+  const now = new Date();
+  return {
+    id: randomUUID(),
+    companyId: world.companyId,
+    provider: world.connector.provider,
+    host: meta.host,
+    installationId: meta.installationId,
+    accountId: meta.accountId,
+    accountName: meta.accountName,
+    status: "active",
+    syncStatus: "idle",
+    syncCursor: null,
+    syncError: null,
+    lastSyncedAt: null,
+    providerMetadata: meta.providerMetadata,
+    disconnectedAt: null,
+    createdAt: now,
+    updatedAt: now,
+  };
+}
+
+/**
+ * Registers the conformance `it` blocks. Call inside a `describe`. The factory
+ * must return a fresh, isolated world per invocation.
+ */
+export function runProviderConformance(makeWorld: ConformanceWorldFactory) {
+  async function install(world: ProviderConformanceWorld): Promise<RepositoryConnection> {
+    const begin = await world.connector.beginInstallation({ companyId: world.companyId, userId: world.userId });
+    expect(begin.installUrl).toContain("state=");
+    expect(begin.expiresAt.getTime()).toBeGreaterThan(Date.now());
+    const meta = await world.connector.completeInstallation({
+      state: begin.state,
+      installationId: world.installationId,
+      companyId: world.companyId,
+    });
+    expect(meta.installationId).toBe(world.installationId);
+    expect(meta.accountName).toBe(world.accountName);
+    return connectionFromMetadata(world, meta);
+  }
+
+  it("completes installation with a valid signed state and rejects tampered/mismatched state", async () => {
+    const world = makeWorld();
+    world.seed([{ providerRepositoryId: "1", owner: "acme", name: "alpha" }]);
+    const begin = await world.connector.beginInstallation({ companyId: world.companyId, userId: world.userId });
+
+    await expect(world.connector.completeInstallation({
+      state: `${begin.state}tampered`,
+      installationId: world.installationId,
+      companyId: world.companyId,
+    })).rejects.toMatchObject({ status: 422 });
+
+    await expect(world.connector.completeInstallation({
+      state: begin.state,
+      installationId: world.installationId,
+      companyId: "00000000-0000-0000-0000-000000000000",
+    })).rejects.toMatchObject({ status: expect.any(Number) });
+
+    const meta = await world.connector.completeInstallation({
+      state: begin.state,
+      installationId: world.installationId,
+      companyId: world.companyId,
+    });
+    expect(meta.companyId).toBe(world.companyId);
+    expect(meta.userId).toBe(world.userId);
+  });
+
+  it("discovers repositories with pagination and search", async () => {
+    const world = makeWorld();
+    world.seed([
+      { providerRepositoryId: "1", owner: "acme", name: "alpha" },
+      { providerRepositoryId: "2", owner: "acme", name: "beta" },
+      { providerRepositoryId: "3", owner: "acme", name: "gamma" },
+    ]);
+    const connection = await install(world);
+
+    const page1 = await world.connector.discover({ connection, pageSize: 2 });
+    expect(page1.items).toHaveLength(2);
+    expect(page1.nextCursor).not.toBeNull();
+    expect(page1.total).toBe(3);
+
+    const page2 = await world.connector.discover({ connection, pageSize: 2, cursor: page1.nextCursor });
+    expect(page2.items).toHaveLength(1);
+    expect(page2.nextCursor).toBeNull();
+
+    const allIds = [...page1.items, ...page2.items].map((r) => r.providerRepositoryId).sort();
+    expect(allIds).toEqual(["1", "2", "3"]);
+
+    const searched = await world.connector.discover({ connection, query: "beta", pageSize: 10 });
+    expect(searched.items.map((r) => r.name)).toEqual(["beta"]);
+  });
+
+  it("maps discovery items to importable snapshots with stable provider ids", async () => {
+    const world = makeWorld();
+    world.seed([{ providerRepositoryId: "77", owner: "acme", name: "delta" }]);
+    const connection = await install(world);
+    const discovered = (await world.connector.discover({ connection, pageSize: 10 })).items;
+    expect(discovered[0]).toMatchObject({ providerRepositoryId: "77", owner: "acme", name: "delta" });
+    expect(discovered[0]!.cloneUrl).toContain("acme/delta");
+  });
+
+  it("refreshes metadata for a known repository and returns null for unknown ids", async () => {
+    const world = makeWorld();
+    world.seed([{ providerRepositoryId: "5", owner: "acme", name: "epsilon" }]);
+    const connection = await install(world);
+    const refreshed = await world.connector.refreshMetadata({ connection, providerRepositoryId: "5" });
+    expect(refreshed).toMatchObject({ providerRepositoryId: "5" });
+    expect(await world.connector.refreshMetadata({ connection, providerRepositoryId: "does-not-exist" })).toBeNull();
+  });
+
+  it("converges idempotently across sync and reflects rename/transfer by stable id", async () => {
+    const world = makeWorld();
+    world.seed([
+      { providerRepositoryId: "10", owner: "acme", name: "one" },
+      { providerRepositoryId: "11", owner: "acme", name: "two" },
+    ]);
+    const connection = await install(world);
+
+    const first = await world.connector.sync({ connection, cursor: null });
+    expect(first.repositories.map((r) => r.providerRepositoryId).sort()).toEqual(["10", "11"]);
+
+    const second = await world.connector.sync({ connection, cursor: null });
+    expect(second.repositories.map((r) => r.providerRepositoryId).sort()).toEqual(["10", "11"]);
+
+    world.rename("10", { owner: "acme-new", name: "one-renamed" });
+    const afterRename = await world.connector.sync({ connection, cursor: null });
+    const renamed = afterRename.repositories.find((r) => r.providerRepositoryId === "10");
+    expect(renamed?.cloneUrl).toContain("acme-new/one-renamed");
+  });
+
+  it("resolves a short-lived clone credential without leaking secrets into the audit record", async () => {
+    const world = makeWorld();
+    world.seed([{ providerRepositoryId: "9", owner: "acme", name: "zeta" }]);
+    const connection = await install(world);
+    const result = await world.connector.resolveCloneCredential({
+      connection,
+      repository: {
+        id: "repo-uuid",
+        providerRepositoryId: "9",
+        owner: "acme",
+        name: "zeta",
+        host: connection.host,
+        cloneUrl: `https://${connection.host}/acme/zeta.git`,
+      },
+    });
+    expect(result.token).toBeTruthy();
+    expect(result.expiresAt.getTime()).toBeGreaterThan(Date.now());
+    expect(result.authenticatedCloneUrl).toContain(result.token);
+    // The audit record must never carry the token or the authenticated URL.
+    const auditJson = JSON.stringify(result.audit);
+    expect(auditJson).not.toContain(result.token);
+    expect(result.audit).toMatchObject({ repositoryId: "repo-uuid", connectionId: connection.id });
+  });
+}
diff --git a/server/src/__tests__/repository-providers.test.ts b/server/src/__tests__/repository-providers.test.ts
new file mode 100644
index 00000000000..c608e0534fe
--- /dev/null
+++ b/server/src/__tests__/repository-providers.test.ts
@@ -0,0 +1,218 @@
+import { randomUUID } from "node:crypto";
+import { describe, expect, it } from "vitest";
+import {
+  createGitHubProvider,
+  FakeRepositoryProvider,
+  signConnectionState,
+  verifyConnectionState,
+} from "../services/repository-providers/index.js";
+import {
+  FakeGitHubTransport,
+  makeGitHubRepository,
+} from "./helpers/fake-github-transport.js";
+import {
+  runProviderConformance,
+  type ProviderConformanceWorld,
+} from "./helpers/repository-provider-conformance.js";
+
+describe("connection state signing", () => {
+  const secret = "state-secret";
+  const base = {
+    companyId: randomUUID(),
+    userId: randomUUID(),
+    provider: "github",
+    secret,
+    ttlMs: 1000,
+    nonce: "nonce-1",
+  };
+
+  it("round-trips a signed state and binds company/user", () => {
+    const now = new Date("2026-01-01T00:00:00Z");
+    const { state } = signConnectionState({ ...base, now });
+    const payload = verifyConnectionState({ state, provider: "github", secret, now });
+    expect(payload.companyId).toBe(base.companyId);
+    expect(payload.userId).toBe(base.userId);
+  });
+
+  it("rejects expired state", () => {
+    const now = new Date("2026-01-01T00:00:00Z");
+    const { state } = signConnectionState({ ...base, ttlMs: 1000, now });
+    expect(() => verifyConnectionState({
+      state,
+      provider: "github",
+      secret,
+      now: new Date(now.getTime() + 2000),
+    })).toThrow(/expired/i);
+  });
+
+  it("rejects a tampered signature and wrong provider/secret", () => {
+    const { state } = signConnectionState({ ...base });
+    expect(() => verifyConnectionState({ state: `${state}x`, provider: "github", secret })).toThrow(/signature/i);
+    expect(() => verifyConnectionState({ state, provider: "github", secret: "other" })).toThrow(/signature/i);
+    expect(() => verifyConnectionState({ state, provider: "gitlab", secret })).toThrow(/different provider/i);
+  });
+});
+
+describe("fake provider conformance", () => {
+  runProviderConformance((): ProviderConformanceWorld => {
+    const provider = new FakeRepositoryProvider({ provider: "fake", host: "fake.example.com", pageSize: 2 });
+    const companyId = randomUUID();
+    const userId = randomUUID();
+    const installationId = "inst-fake-1";
+    const accountName = "acme";
+    const seedState = { repos: [] as Array<{ providerRepositoryId: string; owner: string; name: string }> };
+    const apply = () => provider.setInstallation({
+      installationId,
+      accountId: "acct-1",
+      accountName,
+      repositories: seedState.repos.map((r) => ({ ...r })),
+    });
+    apply();
+    return {
+      connector: provider.connector(),
+      companyId,
+      userId,
+      installationId,
+      accountName,
+      seed(repos) {
+        seedState.repos = repos.map((r) => ({ ...r }));
+        apply();
+      },
+      rename(providerRepositoryId, next) {
+        provider.rename(installationId, providerRepositoryId, next);
+      },
+    };
+  });
+});
+
+describe("github.com provider conformance", () => {
+  runProviderConformance((): ProviderConformanceWorld => {
+    const transport = new FakeGitHubTransport();
+    const provider = createGitHubProvider({
+      transport,
+      config: { appSlug: "paperclip", stateSecret: "gh-state-secret" },
+    });
+    const companyId = randomUUID();
+    const userId = randomUUID();
+    const installationId = "42";
+    const accountName = "acme";
+    const applyInstallation = (repos: Array<{ providerRepositoryId: string; owner: string; name: string }>) => {
+      transport.setInstallation(
+        { id: installationId, account: { id: 1000, login: accountName, type: "Organization" }, app_slug: "paperclip" },
+        repos.map((r) => makeGitHubRepository({ id: r.providerRepositoryId, owner: r.owner, name: r.name })),
+      );
+    };
+    applyInstallation([]);
+    return {
+      connector: provider,
+      companyId,
+      userId,
+      installationId,
+      accountName,
+      seed(repos) {
+        applyInstallation(repos);
+      },
+      rename(providerRepositoryId, next) {
+        transport.rename(installationId, providerRepositoryId, next);
+      },
+    };
+  });
+});
+
+describe("github.com provider specifics", () => {
+  function setup() {
+    const transport = new FakeGitHubTransport();
+    const provider = createGitHubProvider({
+      transport,
+      config: { appSlug: "paperclip", stateSecret: "gh-state-secret" },
+    });
+    const companyId = randomUUID();
+    const userId = randomUUID();
+    return { transport, provider, companyId, userId };
+  }
+
+  async function connect(ctx: ReturnType<typeof setup>, installationId: string, repos = [] as ReturnType<typeof makeGitHubRepository>[]) {
+    ctx.transport.setInstallation(
+      { id: installationId, account: { id: 7, login: "acme", type: "Organization" }, app_slug: "paperclip", repository_selection: "selected" },
+      repos,
+    );
+    const begin = await ctx.provider.beginInstallation({ companyId: ctx.companyId, userId: ctx.userId });
+    const meta = await ctx.provider.completeInstallation({ state: begin.state, installationId, companyId: ctx.companyId });
+    const now = new Date();
+    const connection = {
+      id: randomUUID(),
+      companyId: ctx.companyId,
+      provider: "github",
+      host: meta.host,
+      installationId: meta.installationId,
+      accountId: meta.accountId,
+      accountName: meta.accountName,
+      status: "active" as const,
+      syncStatus: "idle" as const,
+      syncCursor: null,
+      syncError: null,
+      lastSyncedAt: null,
+      providerMetadata: meta.providerMetadata,
+      disconnectedAt: null,
+      createdAt: now,
+      updatedAt: now,
+    };
+    return { meta, connection };
+  }
+
+  it("builds an install URL bound to the app slug and a signed state", async () => {
+    const ctx = setup();
+    const begin = await ctx.provider.beginInstallation({ companyId: ctx.companyId, userId: ctx.userId });
+    expect(begin.installUrl).toContain("github.com/apps/paperclip/installations/new");
+    expect(begin.installUrl).toContain("state=");
+  });
+
+  it("surfaces installation account metadata without persisting secrets", async () => {
+    const ctx = setup();
+    const { meta } = await connect(ctx, "100");
+    expect(meta).toMatchObject({ installationId: "100", accountName: "acme", accountId: "7", host: "github.com" });
+    expect(JSON.stringify(meta.providerMetadata)).not.toMatch(/token|secret|private/i);
+  });
+
+  it("archived provider repositories import as unavailable", async () => {
+    const ctx = setup();
+    const { connection } = await connect(ctx, "101", [
+      makeGitHubRepository({ id: 1, owner: "acme", name: "live" }),
+      makeGitHubRepository({ id: 2, owner: "acme", name: "old", archived: true }),
+    ]);
+    const synced = await ctx.provider.sync({ connection, cursor: null });
+    const old = synced.repositories.find((r) => r.providerRepositoryId === "2");
+    expect(old?.state).toBe("unavailable");
+    expect(old?.unavailableReason).toMatch(/archived/i);
+  });
+
+  it("paginates a full sync across multiple pages", async () => {
+    const ctx = setup();
+    const repos = Array.from({ length: 150 }, (_, i) => makeGitHubRepository({ id: i + 1, owner: "acme", name: `repo-${i + 1}` }));
+    const { connection } = await connect(ctx, "102", repos);
+    const synced = await ctx.provider.sync({ connection, cursor: null });
+    expect(synced.repositories).toHaveLength(150);
+  });
+
+  it("resolves a short-lived installation clone credential and redacts it from audit", async () => {
+    const ctx = setup();
+    const { connection } = await connect(ctx, "103", [makeGitHubRepository({ id: 5, owner: "acme", name: "secure" })]);
+    const result = await ctx.provider.resolveCloneCredential({
+      connection,
+      repository: { id: "r-1", providerRepositoryId: "5", owner: "acme", name: "secure", host: "github.com", cloneUrl: "https://github.com/acme/secure.git" },
+    });
+    expect(result.token).toMatch(/^ghs_/);
+    expect(result.authenticatedCloneUrl).toBe(`https://x-access-token:${result.token}@github.com/acme/secure.git`);
+    expect(JSON.stringify(result.audit)).not.toContain(result.token);
+  });
+
+  it("propagates provider token-mint failures for revoked installations", async () => {
+    const ctx = setup();
+    const { connection } = await connect(ctx, "104", [makeGitHubRepository({ id: 6, owner: "acme", name: "revoked" })]);
+    ctx.transport.failTokenMint = new Error("installation suspended");
+    await expect(ctx.provider.resolveCloneCredential({
+      connection,
+      repository: { id: "r-2", providerRepositoryId: "6", owner: "acme", name: "revoked", host: "github.com", cloneUrl: "https://github.com/acme/revoked.git" },
+    })).rejects.toThrow(/suspended/);
+  });
+});
diff --git a/server/src/services/repository-providers/connection-state.ts b/server/src/services/repository-providers/connection-state.ts
new file mode 100644
index 00000000000..cdd9642ce70
--- /dev/null
+++ b/server/src/services/repository-providers/connection-state.ts
@@ -0,0 +1,95 @@
+import { createHmac, timingSafeEqual } from "node:crypto";
+import { unprocessable } from "../../errors.js";
+
+/**
+ * Signed, expiring connection state for provider install/callback flows.
+ *
+ * The state is an HMAC-SHA256 signed, base64url-encoded payload bound to the
+ * company and user that initiated the connection. It carries an expiry and a
+ * nonce so a callback cannot be replayed after it lapses or be forged without
+ * the app's state secret. The secret never leaves the server and is never
+ * persisted on any connection/repository row.
+ */
+
+export interface ConnectionStatePayload {
+  companyId: string;
+  userId: string;
+  provider: string;
+  /** Optional app-relative return path. */
+  redirectPath?: string | null;
+  /** Random per-request nonce. */
+  nonce: string;
+  /** Issued-at epoch ms. */
+  iat: number;
+  /** Expiry epoch ms. */
+  exp: number;
+}
+
+export interface SignConnectionStateInput {
+  companyId: string;
+  userId: string;
+  provider: string;
+  redirectPath?: string | null;
+  secret: string;
+  ttlMs: number;
+  nonce: string;
+  now?: Date;
+}
+
+function base64url(input: Buffer | string): string {
+  return Buffer.from(input).toString("base64url");
+}
+
+function sign(secret: string, body: string): string {
+  return createHmac("sha256", secret).update(body).digest("base64url");
+}
+
+export function signConnectionState(input: SignConnectionStateInput): { state: string; payload: ConnectionStatePayload } {
+  if (!input.secret) throw unprocessable("Provider state secret is not configured");
+  const iat = (input.now ?? new Date()).getTime();
+  const payload: ConnectionStatePayload = {
+    companyId: input.companyId,
+    userId: input.userId,
+    provider: input.provider,
+    redirectPath: input.redirectPath ?? null,
+    nonce: input.nonce,
+    iat,
+    exp: iat + Math.max(1, input.ttlMs),
+  };
+  const body = base64url(JSON.stringify(payload));
+  const signature = sign(input.secret, body);
+  return { state: `${body}.${signature}`, payload };
+}
+
+export interface VerifyConnectionStateInput {
+  state: string;
+  provider: string;
+  secret: string;
+  now?: Date;
+}
+
+export function verifyConnectionState(input: VerifyConnectionStateInput): ConnectionStatePayload {
+  if (!input.secret) throw unprocessable("Provider state secret is not configured");
+  const parts = input.state.split(".");
+  if (parts.length !== 2 || !parts[0] || !parts[1]) throw unprocessable("Connection state is malformed");
+  const [body, signature] = parts;
+  const expected = sign(input.secret, body);
+  const expectedBuf = Buffer.from(expected);
+  const actualBuf = Buffer.from(signature);
+  if (expectedBuf.length !== actualBuf.length || !timingSafeEqual(expectedBuf, actualBuf)) {
+    throw unprocessable("Connection state signature is invalid");
+  }
+
+  let payload: ConnectionStatePayload;
+  try {
+    payload = JSON.parse(Buffer.from(body, "base64url").toString("utf8")) as ConnectionStatePayload;
+  } catch {
+    throw unprocessable("Connection state payload is invalid");
+  }
+
+  if (payload.provider !== input.provider) throw unprocessable("Connection state is for a different provider");
+  const now = (input.now ?? new Date()).getTime();
+  if (typeof payload.exp !== "number" || now > payload.exp) throw unprocessable("Connection state has expired");
+  if (!payload.companyId || !payload.userId) throw unprocessable("Connection state is missing its subject binding");
+  return payload;
+}
diff --git a/server/src/services/repository-providers/fake-provider.ts b/server/src/services/repository-providers/fake-provider.ts
new file mode 100644
index 00000000000..c505f07d027
--- /dev/null
+++ b/server/src/services/repository-providers/fake-provider.ts
@@ -0,0 +1,229 @@
+import { randomUUID } from "node:crypto";
+import type { RepositoryConnection, RepositoryVisibility } from "@paperclipai/shared";
+import { conflict, unprocessable } from "../../errors.js";
+import type { ProviderRepositorySnapshot } from "../repositories.js";
+import { normalizeRepositoryLocator } from "../repository-normalization.js";
+import { signConnectionState, verifyConnectionState } from "./connection-state.js";
+import type {
+  BeginInstallationInput,
+  BeginInstallationResult,
+  CompleteInstallationInput,
+  CompleteInstallationResult,
+  DiscoverInput,
+  DiscoverResult,
+  RefreshMetadataInput,
+  RepositoryProviderConnector,
+  ResolveCloneCredentialInput,
+  ResolveCloneCredentialResult,
+} from "./provider-contract.js";
+
+/**
+ * In-memory reference provider used by the conformance harness. It implements
+ * the full {@link RepositoryProviderConnector} contract with a controllable
+ * backing world so tests can exercise installation lifecycle, discovery,
+ * pagination, metadata refresh, rename/transfer, revocation, and short-lived
+ * clone credential resolution against a known-good implementation.
+ */
+
+export interface FakeRepository {
+  providerRepositoryId: string;
+  owner: string;
+  name: string;
+  defaultBranch?: string | null;
+  visibility?: RepositoryVisibility;
+  archived?: boolean;
+}
+
+export interface FakeInstallation {
+  installationId: string;
+  accountId: string;
+  accountName: string;
+  repositories: FakeRepository[];
+}
+
+export interface FakeProviderOptions {
+  provider?: string;
+  host?: string;
+  stateSecret?: string;
+  pageSize?: number;
+  tokenTtlMs?: number;
+  clock?: () => Date;
+}
+
+export class FakeRepositoryProvider {
+  readonly provider: string;
+  readonly host: string;
+  private readonly stateSecret: string;
+  private readonly defaultPageSize: number;
+  private readonly tokenTtlMs: number;
+  private readonly clock: () => Date;
+  private readonly installations = new Map<string, FakeInstallation>();
+  private tokenCounter = 0;
+
+  constructor(options: FakeProviderOptions = {}) {
+    this.provider = (options.provider ?? "fake").toLowerCase();
+    this.host = (options.host ?? "fake.example.com").toLowerCase();
+    this.stateSecret = options.stateSecret ?? "fake-state-secret";
+    this.defaultPageSize = options.pageSize ?? 2;
+    this.tokenTtlMs = options.tokenTtlMs ?? 60 * 60 * 1000;
+    this.clock = options.clock ?? (() => new Date());
+  }
+
+  /** Register/replace an installation's repository set. */
+  setInstallation(installation: FakeInstallation) {
+    this.installations.set(installation.installationId, {
+      ...installation,
+      repositories: [...installation.repositories],
+    });
+  }
+
+  /** Rename/transfer a repository, keeping its provider id stable. */
+  rename(installationId: string, providerRepositoryId: string, next: { owner: string; name: string }) {
+    const installation = this.installations.get(installationId);
+    const repo = installation?.repositories.find((r) => r.providerRepositoryId === providerRepositoryId);
+    if (!repo) throw new Error(`fake repository ${providerRepositoryId} not found`);
+    repo.owner = next.owner;
+    repo.name = next.name;
+  }
+
+  private cloneUrl(repo: FakeRepository) {
+    return `https://${this.host}/${repo.owner}/${repo.name}.git`;
+  }
+
+  private webUrl(repo: FakeRepository) {
+    return `https://${this.host}/${repo.owner}/${repo.name}`;
+  }
+
+  private snapshot(repo: FakeRepository): ProviderRepositorySnapshot {
+    return {
+      providerRepositoryId: repo.providerRepositoryId,
+      cloneUrl: this.cloneUrl(repo),
+      webUrl: this.webUrl(repo),
+      defaultBranch: repo.defaultBranch ?? "main",
+      visibility: repo.visibility ?? "private",
+      state: repo.archived ? "unavailable" : "active",
+      unavailableReason: repo.archived ? "Repository is archived" : null,
+      providerMetadata: { owner: repo.owner, name: repo.name, archived: repo.archived ?? false },
+    };
+  }
+
+  private requireInstallation(connection: RepositoryConnection): FakeInstallation {
+    if (!connection.installationId) throw unprocessable("Connection is missing an installation id");
+    const installation = this.installations.get(connection.installationId);
+    if (!installation) throw unprocessable("Installation was not found");
+    return installation;
+  }
+
+  connector(): RepositoryProviderConnector {
+    const self = this;
+    return {
+      provider: self.provider,
+      host: self.host,
+
+      async beginInstallation(input: BeginInstallationInput): Promise<BeginInstallationResult> {
+        const ttlMs = 10 * 60 * 1000;
+        const { state, payload } = signConnectionState({
+          companyId: input.companyId,
+          userId: input.userId,
+          provider: self.provider,
+          redirectPath: input.redirectPath ?? null,
+          secret: self.stateSecret,
+          ttlMs,
+          nonce: randomUUID(),
+          now: self.clock(),
+        });
+        return {
+          installUrl: `https://${self.host}/install?state=${encodeURIComponent(state)}`,
+          state,
+          expiresAt: new Date(payload.exp),
+        };
+      },
+
+      async completeInstallation(input: CompleteInstallationInput): Promise<CompleteInstallationResult> {
+        const payload = verifyConnectionState({
+          state: input.state,
+          provider: self.provider,
+          secret: self.stateSecret,
+          now: self.clock(),
+        });
+        if (payload.companyId !== input.companyId) throw conflict("Connection state company mismatch");
+        const installation = self.installations.get(input.installationId);
+        if (!installation) throw unprocessable("Installation was not found");
+        return {
+          companyId: payload.companyId,
+          userId: payload.userId,
+          installationId: installation.installationId,
+          accountId: installation.accountId,
+          accountName: installation.accountName,
+          host: self.host,
+          providerMetadata: { account_login: installation.accountName },
+        };
+      },
+
+      async discover(input: DiscoverInput): Promise<DiscoverResult> {
+        const installation = self.requireInstallation(input.connection);
+        const perPage = input.pageSize ?? self.defaultPageSize;
+        const page = input.cursor ? Number.parseInt(input.cursor, 10) : 1;
+        if (!Number.isFinite(page) || page < 1) throw unprocessable("Discovery cursor is invalid");
+        const query = input.query?.trim().toLowerCase();
+        const matches = installation.repositories.filter((repo) =>
+          !query || `${repo.owner}/${repo.name}`.toLowerCase().includes(query),
+        );
+        const start = (page - 1) * perPage;
+        const slice = matches.slice(start, start + perPage);
+        return {
+          items: slice.map((repo) => ({
+            providerRepositoryId: repo.providerRepositoryId,
+            owner: repo.owner,
+            name: repo.name,
+            cloneUrl: self.cloneUrl(repo),
+            webUrl: self.webUrl(repo),
+            defaultBranch: repo.defaultBranch ?? "main",
+            visibility: repo.visibility ?? "private",
+            archived: repo.archived ?? false,
+            metadata: { owner: repo.owner, name: repo.name },
+          })),
+          nextCursor: start + perPage < matches.length ? String(page + 1) : null,
+          total: matches.length,
+        };
+      },
+
+      async refreshMetadata(input: RefreshMetadataInput): Promise<ProviderRepositorySnapshot | null> {
+        const installation = self.requireInstallation(input.connection);
+        const repo = installation.repositories.find((r) => r.providerRepositoryId === input.providerRepositoryId);
+        return repo ? self.snapshot(repo) : null;
+      },
+
+      async sync(input: { connection: RepositoryConnection; cursor: string | null }) {
+        const installation = self.requireInstallation(input.connection);
+        return { repositories: installation.repositories.map((repo) => self.snapshot(repo)), cursor: null };
+      },
+
+      async resolveCloneCredential(input: ResolveCloneCredentialInput): Promise<ResolveCloneCredentialResult> {
+        const installation = self.requireInstallation(input.connection);
+        self.tokenCounter += 1;
+        const token = `fake-token-${self.tokenCounter}`;
+        const expiresAt = new Date(self.clock().getTime() + self.tokenTtlMs);
+        return {
+          username: "x-access-token",
+          token,
+          authenticatedCloneUrl:
+            `https://x-access-token:${token}@${input.repository.host}/${input.repository.owner}/${input.repository.name}.git`,
+          expiresAt,
+          audit: {
+            provider: self.provider,
+            host: self.host,
+            connectionId: input.connection.id,
+            repositoryId: input.repository.id,
+            installationId: installation.installationId,
+            expiresAt,
+          },
+        };
+      },
+
+      async disconnect(): Promise<void> {
+        // No persisted token to revoke.
+      },
+    };
+  }
+}
diff --git a/server/src/services/repository-providers/github-provider.ts b/server/src/services/repository-providers/github-provider.ts
new file mode 100644
index 00000000000..93d95c08885
--- /dev/null
+++ b/server/src/services/repository-providers/github-provider.ts
@@ -0,0 +1,294 @@
+import { randomUUID } from "node:crypto";
+import type { RepositoryConnection, RepositoryVisibility } from "@paperclipai/shared";
+import { conflict, unprocessable } from "../../errors.js";
+import type { ProviderRepositorySnapshot } from "../repositories.js";
+import {
+  normalizeRepositoryLocator,
+  sanitizeRepositoryProviderMetadata,
+} from "../repository-normalization.js";
+import {
+  signConnectionState,
+  verifyConnectionState,
+} from "./connection-state.js";
+import type {
+  BeginInstallationInput,
+  BeginInstallationResult,
+  CompleteInstallationInput,
+  CompleteInstallationResult,
+  DiscoverInput,
+  DiscoverResult,
+  DiscoveredRepository,
+  RefreshMetadataInput,
+  RepositoryProviderConnector,
+  ResolveCloneCredentialInput,
+  ResolveCloneCredentialResult,
+} from "./provider-contract.js";
+
+export const GITHUB_PROVIDER = "github";
+export const GITHUB_DEFAULT_HOST = "github.com";
+const DISCOVERY_DEFAULT_PAGE_SIZE = 30;
+const DISCOVERY_MAX_PAGE_SIZE = 100;
+const STATE_TTL_MS = 10 * 60 * 1000;
+
+/** Raw GitHub repository shape (only the fields we consume). */
+export interface GitHubRepository {
+  id: number | string;
+  name: string;
+  full_name: string;
+  owner: { login: string; id?: number | string; type?: string };
+  clone_url: string;
+  html_url?: string;
+  default_branch?: string | null;
+  private?: boolean;
+  visibility?: string | null;
+  archived?: boolean;
+  fork?: boolean;
+}
+
+export interface GitHubInstallation {
+  id: number | string;
+  account: { id?: number | string; login: string; type?: string; html_url?: string } | null;
+  app_slug?: string;
+  target_type?: string;
+  repository_selection?: string;
+}
+
+export interface GitHubInstallationToken {
+  token: string;
+  expiresAt: Date;
+}
+
+/**
+ * Injectable transport that isolates all GitHub App authentication (App JWT
+ * minting, installation-token exchange) and HTTP access behind a small surface.
+ * The real transport holds the app private key; tests inject a fake. The
+ * private key/token never cross back into the provider's persisted output.
+ */
+export interface GitHubAppTransport {
+  readonly host: string;
+  readonly apiBaseUrl: string;
+  getInstallation(installationId: string): Promise<GitHubInstallation | null>;
+  createInstallationAccessToken(installationId: string): Promise<GitHubInstallationToken>;
+  listRepositories(input: {
+    installationId: string;
+    page: number;
+    perPage: number;
+    query?: string | null;
+  }): Promise<{ totalCount: number | null; items: GitHubRepository[] }>;
+  getRepository(input: {
+    installationId: string;
+    providerRepositoryId: string;
+  }): Promise<GitHubRepository | null>;
+}
+
+export interface GitHubProviderConfig {
+  /** App slug used to build the install URL (github.com/apps/<slug>/installations/new). */
+  appSlug: string;
+  /** Secret used to sign expiring connection state. Never persisted. */
+  stateSecret: string;
+}
+
+export interface GitHubProviderDeps {
+  transport: GitHubAppTransport;
+  config: GitHubProviderConfig;
+  clock?: () => Date;
+  nonce?: () => string;
+}
+
+function mapVisibility(repo: GitHubRepository): RepositoryVisibility {
+  if (repo.visibility === "public" || repo.visibility === "private" || repo.visibility === "internal") {
+    return repo.visibility;
+  }
+  if (repo.private === true) return "private";
+  if (repo.private === false) return "public";
+  return "unknown";
+}
+
+function toSnapshot(repo: GitHubRepository): ProviderRepositorySnapshot {
+  const metadata = sanitizeRepositoryProviderMetadata({
+    full_name: repo.full_name,
+    owner: repo.owner?.login ?? null,
+    owner_type: repo.owner?.type ?? null,
+    archived: repo.archived ?? false,
+    fork: repo.fork ?? false,
+  });
+  return {
+    providerRepositoryId: String(repo.id),
+    cloneUrl: repo.clone_url,
+    webUrl: repo.html_url ?? null,
+    defaultBranch: repo.default_branch ?? null,
+    visibility: mapVisibility(repo),
+    // A repository archived on the provider stays importable but is surfaced as
+    // unavailable so operators see it cannot be worked on without unarchiving.
+    state: repo.archived ? "unavailable" : "active",
+    unavailableReason: repo.archived ? "Repository is archived on GitHub" : null,
+    providerMetadata: metadata,
+  };
+}
+
+function toDiscovered(repo: GitHubRepository): DiscoveredRepository {
+  const normalized = normalizeRepositoryLocator(repo.clone_url);
+  return {
+    providerRepositoryId: String(repo.id),
+    owner: normalized.owner,
+    name: normalized.name,
+    cloneUrl: normalized.cloneUrl,
+    webUrl: repo.html_url ?? normalized.webUrl,
+    defaultBranch: repo.default_branch ?? null,
+    visibility: mapVisibility(repo),
+    archived: repo.archived ?? false,
+    metadata: sanitizeRepositoryProviderMetadata({
+      full_name: repo.full_name,
+      owner: repo.owner?.login ?? null,
+      fork: repo.fork ?? false,
+    }),
+  };
+}
+
+function clampPageSize(pageSize: number | undefined): number {
+  if (!pageSize || !Number.isFinite(pageSize)) return DISCOVERY_DEFAULT_PAGE_SIZE;
+  return Math.min(DISCOVERY_MAX_PAGE_SIZE, Math.max(1, Math.floor(pageSize)));
+}
+
+function parseCursor(cursor: string | null | undefined): number {
+  if (!cursor) return 1;
+  const page = Number.parseInt(cursor, 10);
+  if (!Number.isFinite(page) || page < 1) throw unprocessable("Discovery cursor is invalid");
+  return page;
+}
+
+function requireInstallationId(connection: RepositoryConnection): string {
+  if (!connection.installationId) throw unprocessable("GitHub connection is missing an installation id");
+  return connection.installationId;
+}
+
+export function createGitHubProvider(deps: GitHubProviderDeps): RepositoryProviderConnector {
+  const clock = deps.clock ?? (() => new Date());
+  const nonce = deps.nonce ?? (() => randomUUID());
+  const host = deps.transport.host.toLowerCase();
+
+  return {
+    provider: GITHUB_PROVIDER,
+    host,
+
+    async beginInstallation(input: BeginInstallationInput): Promise<BeginInstallationResult> {
+      if (!input.companyId || !input.userId) throw unprocessable("Installation requires a company and user");
+      const { state, payload } = signConnectionState({
+        companyId: input.companyId,
+        userId: input.userId,
+        provider: GITHUB_PROVIDER,
+        redirectPath: input.redirectPath ?? null,
+        secret: deps.config.stateSecret,
+        ttlMs: STATE_TTL_MS,
+        nonce: nonce(),
+        now: clock(),
+      });
+      const installUrl = `https://${host}/apps/${encodeURIComponent(deps.config.appSlug)}/installations/new?state=${encodeURIComponent(state)}`;
+      return { installUrl, state, expiresAt: new Date(payload.exp) };
+    },
+
+    async completeInstallation(input: CompleteInstallationInput): Promise<CompleteInstallationResult> {
+      const payload = verifyConnectionState({
+        state: input.state,
+        provider: GITHUB_PROVIDER,
+        secret: deps.config.stateSecret,
+        now: clock(),
+      });
+      if (payload.companyId !== input.companyId) {
+        throw conflict("Connection state does not match the completing company");
+      }
+      if (!input.installationId) throw unprocessable("Installation callback is missing an installation id");
+      const installation = await deps.transport.getInstallation(input.installationId);
+      if (!installation) throw unprocessable("GitHub installation was not found");
+      return {
+        companyId: payload.companyId,
+        userId: payload.userId,
+        installationId: String(installation.id),
+        accountId: installation.account?.id != null ? String(installation.account.id) : null,
+        accountName: installation.account?.login ?? null,
+        host,
+        providerMetadata: sanitizeRepositoryProviderMetadata({
+          account_login: installation.account?.login ?? null,
+          account_type: installation.account?.type ?? null,
+          app_slug: installation.app_slug ?? deps.config.appSlug,
+          target_type: installation.target_type ?? null,
+          repository_selection: installation.repository_selection ?? null,
+        }),
+      };
+    },
+
+    async discover(input: DiscoverInput): Promise<DiscoverResult> {
+      const installationId = requireInstallationId(input.connection);
+      const perPage = clampPageSize(input.pageSize);
+      const page = parseCursor(input.cursor);
+      const result = await deps.transport.listRepositories({
+        installationId,
+        page,
+        perPage,
+        query: input.query?.trim() || null,
+      });
+      const items = result.items.map(toDiscovered);
+      const nextCursor = items.length === perPage ? String(page + 1) : null;
+      return { items, nextCursor, total: result.totalCount };
+    },
+
+    async refreshMetadata(input: RefreshMetadataInput): Promise<ProviderRepositorySnapshot | null> {
+      const installationId = requireInstallationId(input.connection);
+      const repo = await deps.transport.getRepository({
+        installationId,
+        providerRepositoryId: input.providerRepositoryId,
+      });
+      return repo ? toSnapshot(repo) : null;
+    },
+
+    async sync(input: {
+      connection: RepositoryConnection;
+      cursor: string | null;
+    }): Promise<{ repositories: ProviderRepositorySnapshot[]; cursor?: string | null }> {
+      const installationId = requireInstallationId(input.connection);
+      const repositories: ProviderRepositorySnapshot[] = [];
+      let page = 1;
+      // Walk every installation page so rename/transfer (stable provider id,
+      // changed owner/name) and newly granted repositories converge idempotently.
+      for (;;) {
+        const result = await deps.transport.listRepositories({
+          installationId,
+          page,
+          perPage: DISCOVERY_MAX_PAGE_SIZE,
+          query: null,
+        });
+        for (const repo of result.items) repositories.push(toSnapshot(repo));
+        if (result.items.length < DISCOVERY_MAX_PAGE_SIZE) break;
+        page += 1;
+      }
+      return { repositories, cursor: null };
+    },
+
+    async resolveCloneCredential(input: ResolveCloneCredentialInput): Promise<ResolveCloneCredentialResult> {
+      const installationId = requireInstallationId(input.connection);
+      const minted = await deps.transport.createInstallationAccessToken(installationId);
+      const username = "x-access-token";
+      const authenticatedCloneUrl = `https://${username}:${minted.token}@${input.repository.host}/${input.repository.owner}/${input.repository.name}.git`;
+      return {
+        username,
+        token: minted.token,
+        authenticatedCloneUrl,
+        expiresAt: minted.expiresAt,
+        audit: {
+          provider: GITHUB_PROVIDER,
+          host,
+          connectionId: input.connection.id,
+          repositoryId: input.repository.id,
+          installationId,
+          expiresAt: minted.expiresAt,
+        },
+      };
+    },
+
+    async disconnect(): Promise<void> {
+      // GitHub App installations are revoked on GitHub's side; there is no
+      // server-side token to invalidate because none is ever persisted. The
+      // connection service marks repositories unavailable transactionally.
+    },
+  };
+}
diff --git a/server/src/services/repository-providers/index.ts b/server/src/services/repository-providers/index.ts
new file mode 100644
index 00000000000..3bbfd9d4d6b
--- /dev/null
+++ b/server/src/services/repository-providers/index.ts
@@ -0,0 +1,4 @@
+export * from "./provider-contract.js";
+export * from "./connection-state.js";
+export * from "./github-provider.js";
+export * from "./fake-provider.js";
diff --git a/server/src/services/repository-providers/provider-contract.ts b/server/src/services/repository-providers/provider-contract.ts
new file mode 100644
index 00000000000..bdb0988ac47
--- /dev/null
+++ b/server/src/services/repository-providers/provider-contract.ts
@@ -0,0 +1,147 @@
+import type { RepositoryConnection, RepositoryVisibility } from "@paperclipai/shared";
+import type { ProviderRepositorySnapshot } from "../repositories.js";
+import type { RepositoryProviderAdapter } from "../repository-connections.js";
+
+/**
+ * First-class repository provider contract.
+ *
+ * Foundation ([PAP-17065]) defined the minimal {@link RepositoryProviderAdapter}
+ * (`sync`/`disconnect`) that the connection service drives. This module extends
+ * that contract with the seams the GitHub.com connection/discovery path needs:
+ * installation lifecycle, searchable paginated discovery, metadata refresh, and
+ * short-lived clone credential resolution.
+ *
+ * The extended surface is intentionally provider-agnostic so the fake provider
+ * used by the conformance harness and the real GitHub.com provider share the
+ * exact same shape. Credentials, provider tokens, and app/private keys never
+ * appear on any persisted row — they only flow through the transient results of
+ * {@link RepositoryProviderConnector.resolveCloneCredential}.
+ */
+
+/** A repository as surfaced by provider discovery, before it is imported. */
+export interface DiscoveredRepository {
+  /** Stable provider-scoped id (survives rename/transfer). */
+  providerRepositoryId: string;
+  owner: string;
+  name: string;
+  cloneUrl: string;
+  webUrl?: string | null;
+  defaultBranch?: string | null;
+  visibility?: RepositoryVisibility;
+  /** True when the repository is archived on the provider. */
+  archived?: boolean;
+  /** Sanitized, secret-free provider metadata for display. */
+  metadata?: Record<string, unknown> | null;
+}
+
+export interface DiscoverInput {
+  connection: RepositoryConnection;
+  /** Free-text filter over owner/name; provider decides matching semantics. */
+  query?: string | null;
+  /** Opaque pagination cursor returned by a previous page. */
+  cursor?: string | null;
+  /** Requested page size; providers may clamp. */
+  pageSize?: number;
+}
+
+export interface DiscoverResult {
+  items: DiscoveredRepository[];
+  /** Opaque cursor for the next page, or null when the last page is reached. */
+  nextCursor: string | null;
+  /** Total matches when the provider can report it, else null. */
+  total: number | null;
+}
+
+export interface BeginInstallationInput {
+  companyId: string;
+  /** User initiating the connection; bound into the signed state. */
+  userId: string;
+  /** Optional app-relative path to return to after the provider callback. */
+  redirectPath?: string | null;
+}
+
+export interface BeginInstallationResult {
+  /** Provider URL the operator visits to authorize/install the app. */
+  installUrl: string;
+  /** Signed, expiring state bound to company/user. */
+  state: string;
+  /** When the signed state stops being valid. */
+  expiresAt: Date;
+}
+
+export interface CompleteInstallationInput {
+  /** Signed state echoed back by the provider callback. */
+  state: string;
+  /** Installation id reported by the provider callback. */
+  installationId: string;
+  /** Company the caller believes it is completing for (defense in depth). */
+  companyId: string;
+}
+
+export interface CompleteInstallationResult {
+  companyId: string;
+  userId: string;
+  installationId: string;
+  accountId: string | null;
+  accountName: string | null;
+  host: string;
+  /** Sanitized installation/account metadata for the connection row. */
+  providerMetadata: Record<string, unknown> | null;
+}
+
+export interface RefreshMetadataInput {
+  connection: RepositoryConnection;
+  providerRepositoryId: string;
+}
+
+export interface ResolveCloneCredentialInput {
+  connection: RepositoryConnection;
+  repository: {
+    id: string;
+    providerRepositoryId: string | null;
+    owner: string;
+    name: string;
+    cloneUrl: string;
+    host: string;
+  };
+}
+
+/**
+ * Result of resolving a short-lived clone credential. The `token` is transient
+ * and MUST NOT be persisted or logged. `audit` carries only secret-free fields
+ * safe to write to the activity log.
+ */
+export interface ResolveCloneCredentialResult {
+  username: string;
+  token: string;
+  /** Clone URL with the transient credential embedded. Never persist. */
+  authenticatedCloneUrl: string;
+  expiresAt: Date;
+  audit: {
+    provider: string;
+    host: string;
+    connectionId: string;
+    repositoryId: string;
+    installationId: string | null;
+    expiresAt: Date;
+  };
+}
+
+/**
+ * The full provider connector contract. Extends the Foundation adapter so a
+ * connector can be registered directly with `repositoryProviderRegistry`.
+ */
+export interface RepositoryProviderConnector extends RepositoryProviderAdapter {
+  readonly provider: string;
+  readonly host: string;
+
+  beginInstallation(input: BeginInstallationInput): Promise<BeginInstallationResult>;
+  completeInstallation(input: CompleteInstallationInput): Promise<CompleteInstallationResult>;
+
+  discover(input: DiscoverInput): Promise<DiscoverResult>;
+  refreshMetadata(input: RefreshMetadataInput): Promise<ProviderRepositorySnapshot | null>;
+
+  resolveCloneCredential(input: ResolveCloneCredentialInput): Promise<ResolveCloneCredentialResult>;
+}
+
+export type { ProviderRepositorySnapshot };