}

    @NotThreadSafe
    class ToolchainsBuilderRequestBuilder {
        ProtoSession session;
        RequestTrace trace;
        Source installationToolchainsSource;
        Source userToolchainsSource;

        public ToolchainsBuilderRequestBuilder session(ProtoSession session) {
            this.session = session;
            return this;
        }

    /** Connection timeout in milliseconds for establishing SMB connections */
    protected int smbConnectionTimeout = SmbConstants.DEFAULT_CONN_TIMEOUT;
    /** Session timeout in milliseconds for SMB sessions */
    protected int smbSessionTimeout = SmbConstants.DEFAULT_SO_TIMEOUT;
    /** Whether idle timeout is disabled for connections */
    protected boolean idleTimeoutDisabled = false;

    @Nonnull
    static ModelBuilderRequest build(@Nonnull Session session, @Nonnull ModelSource source) {
        return builder()
                .session(requireNonNull(session, "session cannot be null"))
                .source(requireNonNull(source, "source cannot be null"))
                .build();
    }

    @Nonnull
    static ModelBuilderRequest build(@Nonnull Session session, @Nonnull Path path) {
        return builder()

        // Session starts with usage count > 0, so acquire/release cycles maintain usage
        assertTrue(session.isInUse(), "Session should be in use initially");

        // Test acquire/release cycles (session remains in use due to initial transport acquire)
        for (int i = 0; i < 3; i++) {
            session.acquire();
            assertTrue(session.isInUse(), "Session should be in use after acquire " + i);

            session.release();

        .build()
    val session = session(heldCertificate.certificatePem())
    assertThat(verifier.verify("foo.com", session)).isFalse()
    assertThat(verifier.verify("bar.com", session)).isFalse()
    assertThat(verifier.verify("k.com", session)).isTrue()
    assertThat(verifier.verify("K.com", session)).isTrue()
    assertThat(verifier.verify("\u2121.com", session)).isFalse()

                        false), MESSAGE_TOO_LARGE("Message too large", ErrorCategory.PROTOCOL, false),

        // Resource errors
        OUT_OF_MEMORY("Out of memory", ErrorCategory.RESOURCE, true), TOO_MANY_SESSIONS("Too many sessions", ErrorCategory.RESOURCE,
                true), RESOURCE_LOCKED("Resource is locked", ErrorCategory.RESOURCE, true),

        // Transient errors

            return null;
        });
    }

    private OptionalThing<HttpSession> getSession() {
        final HttpSession session = request.getSession(false);
        if (session != null) {
            return OptionalEntity.of(session);
        }
        return OptionalEntity.empty();
    }

    /**
     * Unwraps this session to the specified type, allowing access to implementation-specific functionality.
     *
     * @param <T> the type to unwrap to
     * @param type the class of the type to unwrap to
     * @return session instance with the given type
     */
    <T extends SmbSession> T unwrap(Class<T> type);

    /**
     * Returns the CIFS context that this session is attached to.
     *

        byte[] key = new byte[] { 10, 20 };
        when(session.getSessionKey()).thenReturn(key, new byte[0], null);

        assertArrayEquals(key, session.getSessionKey());
        assertArrayEquals(new byte[0], session.getSessionKey());
        assertNull(session.getSessionKey());
        verify(session, times(3)).getSessionKey();
    }

    // Error propagation: getSessionKey throws CIFSException

    }

    @Nonnull
    default DependencyResolverResult resolve(@Nonnull Session session, @Nonnull Project project) {
        return resolve(
                DependencyResolverRequest.build(session, DependencyResolverRequest.RequestType.RESOLVE, project));
    }

    @Nonnull
    default DependencyResolverResult resolve(
            @Nonnull Session session, @Nonnull Project project, @Nonnull PathScope scope) {