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1.1 |
=head1 NAME |
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AnyEvent::MCP::Server - MCP request dispatch and JSON-RPC framing |
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=head1 DESCRIPTION |
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An MCP server needs to understand requests, but it does not necessarily need |
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to own a listening socket. This class handles the protocol: it accepts decoded |
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JSON-RPC objects (or UTF-8 JSON), dispatches requests and delivers responses |
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through callbacks. Its subclasses L<AnyEvent::MCP::Server::JSONL> and |
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L<AnyEvent::MCP::Server::HTTP> handle the actual connections. If you are |
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writing a standalone server, L<AnyEvent::MCP::Server::Simple> is usually |
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the easier starting point. |
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The server implements discovery, initialization, ping and tool listing/calls. |
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The 2025 compatibility path supports ordinary requests and responses, but |
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not server-initiated requests. Permission asking supports modern input |
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challenges as well as local helpers. SSE, subscriptions and schema validation |
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are not implemented yet. |
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1.11 |
The usual object-level assembly is a |
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L<AnyEvent::MCP::Server::Toolset> holding tool callbacks, a Server |
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handling protocol messages, and a transport accepting connections. |
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Use L<AnyEvent::MCP::Server::HTTP/FIRST USE> for an executable HTTP |
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assembly or L<AnyEvent::MCP::Server::JSONL/EXAMPLE> for stdio. |
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The corresponding client entry point is L<AnyEvent::MCP::Client>. |
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Only embedders that already own their transport need C<rpc> or |
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C<json_rpc> directly; these methods do not create connections or run |
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the event loop. |
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1.1 |
=head1 METHODS |
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1.5 |
=over |
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1.1 |
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1.5 |
=item $server = AnyEvent::MCP::Server->new (%config) |
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1.1 |
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1.5 |
Creates the protocol object without opening a listener or starting an |
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event loop. Options are: |
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1.1 |
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1.5 |
=over |
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=item toolsets => [$toolset...] |
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L<AnyEvent::MCP::Server::Toolset> objects searched in order, defaulting to |
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an empty array. The first Toolset containing a called tool handles it. |
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=item server_info => { name => $name, version => $version } |
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Advertised server identity, defaulting to C<AnyEvent::MCP> and this |
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distribution's version. |
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=item instructions => $text |
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Optional human-readable guidance. Surrounding whitespace and common |
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indentation are stripped. Empty instructions are omitted from discovery |
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and initialization results. |
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root |
1.8 |
=item short_instructions => $text |
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Optional condensed guidance for deciding when to discover this server's tools. |
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Used instead of C<instructions> in discovery when C<auto_instructions> is true. |
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Without either short or custom instructions, the full instructions remain |
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advertised. |
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=item custom_instructions => $text |
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Instance-specific purpose, prepended to the advertised instructions. |
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=item auto_instructions => $boolean |
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When true, expose full C<instructions>, prefixed by any custom instance |
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purpose, in a C<meta-instructions> tool's description and call result. |
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1.9 |
Advertise C<short_instructions> instead, when provided, preceded by any |
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custom purpose. Append a pointer to the generated tool's description when |
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short or custom instructions exist. With neither, advertise the original |
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full instructions without a redundant pointer. Defaults to false; |
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1.8 |
a conflicting tool name is an error. |
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1.5 |
=item capabilities => { %capabilities } |
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Advertised server capabilities, defaulting to C<{ tools =E<gt> {} }>. |
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Declaring a capability does not implement it. |
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=item versions => [$version...] |
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Supported revisions in preference order. Defaults to C<2026-07-28>, |
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C<2025-11-25>, C<2025-06-18> and C<2025-03-26>. The 2026 protocol uses |
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discovery and per-request metadata; the 2025 protocol uses initialization. |
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=item permissions => $permissions |
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L<AnyEvent::MCP::Server::Permissions> object used by |
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C<< $req->require_permission >>. The server handles permission-needed |
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exceptions. The permission object's C<ask> setting chooses between modern |
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input challenges and local prompts; local asking retries the handler |
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internally. Checks must precede side effects. |
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=back |
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Event callbacks are also constructor options; see L</EVENTS>. |
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=item $req = $server->rpc ($message, $reply->($message), %context) |
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1.1 |
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Accepts the decoded JSON-RPC hash reference C<$message>. C<$reply> receives |
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1.6 |
the decoded response, or undef when a notification is accepted or a request |
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is cancelled. Undef completes transport bookkeeping without a JSON-RPC |
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response. Returns the Request object for a request, or undef for |
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notifications and rejected messages. |
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1.1 |
C<$reply> can be called before this method returns, or later. |
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C<peer> in C<%context> is a hash reference shared by messages on one connection. |
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It holds legacy initialization state and weak references to outstanding |
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requests for cancellation. Embedders supply a different peer for each |
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independent connection. Modern request metadata takes precedence over legacy |
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peer state. |
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C<protocol_version> supplies the legacy HTTP protocol version. |
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C<on_notify> is an optional C<$callback->($req, $message)> receiving decoded |
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outgoing notifications. Without it, notifications are dropped. |
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1.5 |
=item $req = $server->json_rpc ($json, $reply->($json), %context) |
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1.1 |
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Like C<rpc>, but C<$json> and the response are UTF-8 encoded JSON strings. |
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The notification callback still receives decoded objects. Parse errors are |
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returned as JSON-RPC errors. |
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1.5 |
=item $server->dispatch ($req) |
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1.1 |
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Dispatches an already constructed Request. Normally called by C<rpc>. |
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Subclasses can override this method while retaining JSON-RPC handling. |
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root |
1.5 |
=back |
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root |
1.1 |
=head1 EVENTS |
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root |
1.5 |
=over |
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=item on_request => $callback->($server, $req) |
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1.1 |
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Called before each dispatch attempt, including permission retries. This |
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synchronous hook can inspect the request or refresh application state. |
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It does not replace dispatch; avoid side effects that must happen only once. |
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1.5 |
=item on_tools_list => $callback->($server, $req) |
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1.1 |
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Replaces the default Toolset listing. C<$callback> completes C<$req>. |
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1.5 |
=item on_tools_call => $callback->($server, $req, $args) |
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1.1 |
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Replaces the default Toolset lookup and invocation. C<$args> is also available |
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as C<< $req->{args} >>. C<$callback> completes C<$req>. |
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1.5 |
=item on_error => $callback->($server, $req, $error) |
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1.1 |
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Reports an exception caught during synchronous dispatch. A tool exception |
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becomes a text tool-error result; other exceptions become internal JSON-RPC |
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errors. Exceptions after a reply are propagated, as are exceptions from |
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asynchronous application callbacks. |
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root |
1.5 |
=back |
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root |
1.1 |
=cut |
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package AnyEvent::MCP::Server; |
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use common::sense; |
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use AnyEvent::MCP (); |
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use AnyEvent::MCP::Server::Request (); |
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use JSON::XS (); |
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use Scalar::Util qw(weaken); |
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our @ISA = qw(AnyEvent::MCP::Base); |
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sub new { |
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my $class = shift; |
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my $self = $class->SUPER::new ( |
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toolsets => [], |
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server_info => { name => "AnyEvent::MCP", version => $AnyEvent::MCP::VERSION }, |
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capabilities => { tools => {} }, |
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versions => [qw(2026-07-28 2025-11-25 2025-06-18 2025-03-26)], |
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@_, |
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); |
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$self->{instructions} = AnyEvent::MCP::_clean_text $self->{instructions} |
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if exists $self->{instructions}; |
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root |
1.8 |
my $instructions = $self->{instructions}; |
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my $custom = exists $self->{custom_instructions} |
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? AnyEvent::MCP::_clean_text $self->{custom_instructions} : ""; |
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if ($self->{auto_instructions} && length $instructions) { |
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require AnyEvent::MCP::Server::Toolset; |
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my $name = "meta-instructions"; |
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!grep (exists $_->{tool}{$name}, @{$self->{toolsets}}) |
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or die "duplicate MCP tool '$name'\n"; |
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my $full = join "\n\n", grep length, $custom, $instructions; |
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my $toolset = AnyEvent::MCP::Server::Toolset->new; |
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$toolset->tool (meta_instructions => |
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"Server instructions. Call for full text if truncated.\n\n$full", |
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{ type => "object", properties => {} }, |
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sub { $_[0]->reply ({ content => [{ type => "text", text => $full }] }) }, |
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); |
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$self->{toolsets} = [@{$self->{toolsets}}, $toolset]; |
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my $short = exists $self->{short_instructions} |
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? AnyEvent::MCP::_clean_text $self->{short_instructions} : ""; |
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1.9 |
$self->{instructions} = length $custom || length $short |
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? join ("\n\n", grep length, $custom, $short, "Full instructions: meta-instructions tool description.") |
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: $instructions; |
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root |
1.8 |
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} elsif (length $custom) { |
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$self->{instructions} = join "\n\n", grep length, $custom, $instructions; |
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} |
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root |
1.1 |
$self |
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} |
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sub _rpc_error { |
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my ($self, $reply, $id, $code, $message, $data) = @_; |
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my $error = { code => $code, message => $message }; |
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$error->{data} = $data if defined $data; |
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$reply->({ jsonrpc => "2.0", id => $id, error => $error }); |
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undef |
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} |
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sub json_rpc { |
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my ($self, $json, $reply, @context) = @_; |
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my $send = sub { $reply->(defined $_[0] ? JSON::XS::encode_json $_[0] : undef) }; |
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my $message = eval { JSON::XS::decode_json $json }; |
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return $self->_rpc_error ($send, undef, -32700, "Parse error") |
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if $@; |
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$self->rpc ($message, $send, @context) |
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} |
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sub rpc { |
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my ($self, $message, $reply, %context) = @_; |
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return $self->_rpc_error ($reply, undef, -32600, "Invalid request") |
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unless ref $message eq "HASH" |
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&& $message->{jsonrpc} eq "2.0" |
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&& defined $message->{method} && !ref $message->{method} |
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&& (!exists $message->{id} || defined $message->{id} && !ref $message->{id}); |
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my $id = $message->{id}; |
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my $key = $id; # Hash lookups must not stringify the wire ID. |
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my $method = $message->{method}; |
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my $params = exists $message->{params} ? $message->{params} : {}; |
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my $peer = $context{peer} || {}; |
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unless (exists $message->{id}) { |
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if ($method eq "notifications/cancelled" && ref $params eq "HASH" && defined $params->{requestId}) { |
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my $req = delete $peer->{requests}{$params->{requestId}}; |
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$req->cancel ($params->{reason}) if $req; |
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} |
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$reply->(undef); |
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return |
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} |
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return $self->_rpc_error ($reply, $id, -32602, "Invalid params") |
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unless ref $params eq "HASH" |
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&& (!exists $params->{_meta} || ref $params->{_meta} eq "HASH"); |
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my $meta = $params->{_meta} || {}; |
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my $version = $meta->{"io.modelcontextprotocol/protocolVersion"} |
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|| $context{protocol_version} || $peer->{protocol_version}; |
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if ($method eq "initialize") { |
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$version = $params->{protocolVersion}; |
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return $self->_rpc_error ($reply, $id, -32602, "Invalid initialize params") |
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unless defined $version && !ref $version |
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&& ref $params->{capabilities} eq "HASH" |
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&& ref $params->{clientInfo} eq "HASH"; |
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unless (grep $_ eq $version && $_ lt "2026", @{$self->{versions}}) { |
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($version) = grep $_ lt "2026", @{$self->{versions}}; |
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return $self->_rpc_error ($reply, $id, -32601, "Legacy initialization is not supported") |
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unless defined $version; |
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} |
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} else { |
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return $self->_rpc_error ($reply, $id, -32602, "Missing protocol version") |
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unless defined $version && !ref $version; |
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return $self->_rpc_error ($reply, $id, -32022, "Unsupported protocol version", { |
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requested => $version, |
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supported => $self->{versions}, |
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}) unless grep $_ eq $version, @{$self->{versions}}; |
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if ($version ge "2026") { |
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return $self->_rpc_error ($reply, $id, -32602, "Missing per-request metadata") |
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unless $meta->{"io.modelcontextprotocol/protocolVersion"} eq $version |
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&& ref $meta->{"io.modelcontextprotocol/clientCapabilities"} eq "HASH"; |
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} |
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} |
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return $self->_rpc_error ($reply, $id, -32600, "Request id already outstanding") |
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if $peer->{requests}{$key}; |
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root |
1.4 |
# the private multibroker protocol uses the normal MCP capability handshake. |
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# keep the negotiated version on this stream's peer, not on the server. |
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root |
1.3 |
my $capabilities = $method eq "initialize" |
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? $params->{capabilities} : $meta->{"io.modelcontextprotocol/clientCapabilities"}; |
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if (ref $capabilities eq "HASH") { |
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my $extensions = $capabilities->{extensions}; |
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if (ref $extensions eq "HASH") { |
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my $extension = $extensions->{"anyevent-mcp/multibroker"}; |
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$peer->{aemcp_multibroker} = 1 |
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if ref $extension eq "HASH" && ($extension->{version} || 0) eq "1"; |
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} |
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} |
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root |
1.1 |
my $req = AnyEvent::MCP::Server::Request->new ( |
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root |
1.4 |
server => $self, |
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peer => $peer, |
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id => $id, |
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method => $method, |
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params => $params, |
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root |
1.1 |
protocol_version => $version, |
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root |
1.4 |
on_reply => sub { |
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root |
1.1 |
my ($req, $result) = @_; |
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delete $peer->{requests}{$key}; |
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if ($req->{protocol_version} ge "2026") { |
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$result = { |
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resultType => "complete", |
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%$result, |
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_meta => { |
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"io.modelcontextprotocol/serverInfo" => $self->{server_info}, |
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%{$result->{_meta} || {}}, |
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}, |
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}; |
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} |
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$reply->({ jsonrpc => "2.0", id => $id, result => $result }); |
| 346 |
|
|
}, |
| 347 |
|
|
); |
| 348 |
|
|
|
| 349 |
|
|
if (my $notify = $context{on_notify}) { |
| 350 |
|
|
$req->{on_notify} = sub { |
| 351 |
|
|
my ($req, $method, $params) = @_; |
| 352 |
|
|
|
| 353 |
|
|
$notify->($req, { jsonrpc => "2.0", method => $method, params => $params }); |
| 354 |
|
|
}; |
| 355 |
|
|
} |
| 356 |
|
|
|
| 357 |
|
|
$peer->{requests}{$key} = $req; |
| 358 |
|
|
weaken $peer->{requests}{$key}; |
| 359 |
|
|
|
| 360 |
|
|
if ($method eq "tools/call") { |
| 361 |
|
|
unless (defined $params->{name} && !ref $params->{name} |
| 362 |
|
|
&& (!exists $params->{arguments} || ref $params->{arguments} eq "HASH")) { |
| 363 |
|
|
$self->_reject ($req, $reply, -32602, "Invalid tool call"); |
| 364 |
|
|
return $req |
| 365 |
|
|
} |
| 366 |
|
|
|
| 367 |
|
|
$req->{tool} = $params->{name}; |
| 368 |
|
|
$req->{args} = exists $params->{arguments} ? $params->{arguments} : {}; |
| 369 |
|
|
} |
| 370 |
|
|
|
| 371 |
|
|
$req->{_reply} = $reply; |
| 372 |
|
|
|
| 373 |
|
|
$self->_dispatch ($req); |
| 374 |
|
|
|
| 375 |
|
|
$req |
| 376 |
|
|
} |
| 377 |
|
|
|
| 378 |
|
|
sub _dispatch { |
| 379 |
|
|
my ($self, $req) = @_; |
| 380 |
|
|
|
| 381 |
|
|
eval { |
| 382 |
|
|
$self->{permissions}->_resume ($req) |
| 383 |
|
|
if $self->{permissions} && $req->{method} eq "tools/call"; |
| 384 |
|
|
$self->event (request => $req); |
| 385 |
|
|
$self->dispatch ($req) unless $req->{finished}; |
| 386 |
|
|
1 |
| 387 |
|
|
} or do { |
| 388 |
|
|
my $error = $@; |
| 389 |
|
|
die $error if $req->{finished}; |
| 390 |
|
|
|
| 391 |
|
|
if (ref $error eq "AnyEvent::MCP::Server::Permissions::Required" && $self->{permissions}) { |
| 392 |
|
|
eval { |
| 393 |
|
|
$self->{permissions}->require ($req, $error->{request}, sub { |
| 394 |
|
|
my ($success, $grant) = @_; |
| 395 |
root |
1.4 |
|
| 396 |
root |
1.1 |
return if $req->{finished}; |
| 397 |
|
|
return $req->error ($grant) unless $success; |
| 398 |
|
|
|
| 399 |
|
|
$self->{permissions}->_remember ($req, $error->{request}, $grant); |
| 400 |
|
|
$self->_dispatch ($req); |
| 401 |
|
|
}); |
| 402 |
|
|
1 |
| 403 |
|
|
} or do { |
| 404 |
|
|
my $failure = $@; |
| 405 |
|
|
die $failure if $req->{finished}; |
| 406 |
|
|
$self->event (error => $req, $failure); |
| 407 |
|
|
$req->error ($failure); |
| 408 |
|
|
}; |
| 409 |
|
|
} else { |
| 410 |
|
|
$self->event (error => $req, $error); |
| 411 |
|
|
|
| 412 |
|
|
if ($req->{method} eq "tools/call") { |
| 413 |
|
|
$req->error ($error); |
| 414 |
|
|
} else { |
| 415 |
|
|
$self->_reject ($req, $req->{_reply}, -32603, "Internal error"); |
| 416 |
|
|
} |
| 417 |
|
|
} |
| 418 |
|
|
}; |
| 419 |
|
|
} |
| 420 |
|
|
|
| 421 |
|
|
sub _reject { |
| 422 |
|
|
my ($self, $req, $reply, $code, $message) = @_; |
| 423 |
|
|
|
| 424 |
|
|
$req->{finished} = 1; |
| 425 |
|
|
my $key = $req->{id}; |
| 426 |
|
|
delete $req->{peer}{requests}{$key}; |
| 427 |
|
|
delete @$req{qw(on_reply on_notify on_cancel _reply)}; |
| 428 |
|
|
|
| 429 |
|
|
$self->_rpc_error ($reply, $req->{id}, $code, $message) |
| 430 |
|
|
} |
| 431 |
|
|
|
| 432 |
|
|
sub dispatch { |
| 433 |
|
|
my ($self, $req) = @_; |
| 434 |
root |
1.4 |
|
| 435 |
root |
1.1 |
my $method = $req->{method}; |
| 436 |
|
|
|
| 437 |
|
|
if ($method eq "initialize") { |
| 438 |
|
|
$req->{peer}{protocol_version} = $req->{protocol_version}; |
| 439 |
|
|
$req->{peer}{client_info} = $req->{params}{clientInfo}; |
| 440 |
|
|
$req->{peer}{client_capabilities} = $req->{params}{capabilities}; |
| 441 |
|
|
|
| 442 |
|
|
my $result = { |
| 443 |
|
|
protocolVersion => $req->{protocol_version}, |
| 444 |
|
|
serverInfo => $self->{server_info}, |
| 445 |
|
|
capabilities => $self->{capabilities}, |
| 446 |
|
|
}; |
| 447 |
root |
1.2 |
$result->{instructions} = $self->{instructions} if length $self->{instructions}; |
| 448 |
root |
1.1 |
|
| 449 |
|
|
$req->reply ($result); |
| 450 |
|
|
|
| 451 |
|
|
} elsif ($method eq "server/discover") { |
| 452 |
|
|
my $result = { |
| 453 |
|
|
supportedVersions => $self->{versions}, |
| 454 |
|
|
capabilities => $self->{capabilities}, |
| 455 |
|
|
}; |
| 456 |
root |
1.2 |
$result->{instructions} = $self->{instructions} if length $self->{instructions}; |
| 457 |
root |
1.1 |
|
| 458 |
|
|
$req->reply ($result); |
| 459 |
|
|
|
| 460 |
|
|
} elsif ($method eq "ping") { |
| 461 |
|
|
$req->reply ({}); |
| 462 |
|
|
|
| 463 |
|
|
} elsif ($method eq "tools/list") { |
| 464 |
|
|
if ($self->{on_tools_list}) { |
| 465 |
|
|
$self->event (tools_list => $req); |
| 466 |
|
|
} else { |
| 467 |
|
|
$req->reply ({ tools => [map @{$_->list}, @{$self->{toolsets}}] }); |
| 468 |
|
|
} |
| 469 |
|
|
|
| 470 |
|
|
} elsif ($method eq "tools/call") { |
| 471 |
|
|
if ($self->{on_tools_call}) { |
| 472 |
|
|
$self->event (tools_call => $req, $req->{args}); |
| 473 |
|
|
} else { |
| 474 |
|
|
my ($toolset) = grep exists $_->{tool}{$req->{tool}}, @{$self->{toolsets}}; |
| 475 |
|
|
|
| 476 |
|
|
if ($toolset) { |
| 477 |
|
|
$toolset->call ($req); |
| 478 |
|
|
} else { |
| 479 |
|
|
$self->_reject ($req, $req->{_reply}, -32602, "Unknown tool '$req->{tool}'"); |
| 480 |
|
|
} |
| 481 |
|
|
} |
| 482 |
|
|
|
| 483 |
|
|
} else { |
| 484 |
|
|
$self->_reject ($req, $req->{_reply}, -32601, "Method not found"); |
| 485 |
|
|
} |
| 486 |
|
|
} |
| 487 |
|
|
|
| 488 |
|
|
1 |
