MCP/Server/Simple.pm

=head1 NAME

AnyEvent::MCP::Server::Simple - simple function interface for MCP servers

=head1 SYNOPSIS

   use AnyEvent::MCP::Server::Simple;

   mcp_config
      server_info   => {
         name    => "example",
         version => "0",
      },
      instructions => <<'EOF';
         Use echo to return the supplied text.
   EOF

   mcp_tool echo =>
      "Return the supplied text.",
      {
         type       => "object",
         properties => { text => { type => "string" } },
         required   => ["text"],
      },
      sub {
         my ($req, $args) = @_;

         $req->reply ({
            content => [{ type => "text", text => $args->{text} }],
         });
      };

   mcp_start;

=head1 DESCRIPTION

For most MCP servers, registering a few tools and starting a transport is
enough. This module does just that: call C<mcp_tool> to register callbacks,
optionally configure the server with C<mcp_config>, then start it with
C<mcp_start>, C<mcp_stdio> or C<mcp_http>. Registration alone does not start
a server or an event loop.

Human-readable descriptions and instructions are stripped of surrounding
whitespace and common indentation when registered, so indented here-documents
can be used naturally.

C<mcp_start>, C<mcp_stdio> and C<mcp_http> are alternative blocking entry
points for a self-contained server. They run AnyEvent until shutdown; you
do not start another event loop. If your application already owns the server
lifetime or needs several transports, use the object interfaces instead.

Simple uses L<AnyEvent::MCP::Server> and a default Toolset internally; it is
not a second server implementation. Applications needing custom dispatch,
such as a multibroker, can use the Server API directly.

=head1 FUNCTIONS

=over

=item mcp_config %config

Adds server configuration. Repeated calls extend or replace previously declared
values. C<instructions> is treated as human-readable text and normalized.

C<server_info> contains the MCP server metadata, including C<name> and
C<version>. C<instructions> contains guidance for the client.

C<on_request> is a synchronous hook called before dispatch:

   $callback->($server, $req)

For example, an application can refresh database state before each request.
It does not replace dispatch or receive a completion callback. These options
belong to Server; Simple merely collects and passes them on.

C<on_start> is C<$callback->($server)>, called after the transport is ready
and before entering the event loop. It can print application startup
information or install watchers. C<$server> is the underlying server object.
The callback must not block.

C<idle_exit> is an optional positive idle time in seconds for spawned stdio
servers. With a multibroker advertising C<anyevent-mcp/multibroker> version 1,
Simple requests shutdown once no MCP requests have been active for that long.
The broker can ignore the request. HTTP servers, ordinary clients and servers
without this option are unaffected.

=item mcp_tool $name, $description, $input_schema, $callback->($req, $args)

Registers a tool named C<$name> with C<$description> and the JSON Schema
hash reference C<$input_schema>. C<$description> is normalized like
C<instructions>.

C<$callback> receives an L<AnyEvent::MCP::Server::Request> object C<$req>
and its C<< $req->{args} >> hash reference as C<$args>, for convenience.

Tools complete the request with C<< $req->reply ($result) >>, or use
C<< $req->result ($data) >> and C<< $req->error ($message) >> for convenience.
Request context is available directly in
the hash, for example C<< $req->{tool} >> and C<< $req->{server} >>.

=item %server_options = mcp_getoptions ({ %settings }, @getopt_options)

Parse standard server options C<--name>, C<--bind>, repeatable
C<--token>, C<--stdio>, C<--print-url> and C<--help> alongside any
application-specific L<Getopt::Long> option specifications:

   my $verbose;
   my %options = mcp_getoptions (
      {
         usage => "Usage: $0 [OPTION]... WORKDIR\n",
         description => "Provide example tools through MCP.",
         option_heading => "Example options:",
         options => [
            ["--verbose", "Show additional diagnostics"],
         ],
         examples => "  $0 --stdio ./project",
         path => "/",
      },
      "verbose!" => \$verbose,
   );
   @ARGV == 1 or die "workdir required\n";
   mcp_start %options;

The optional leading hash defines GNU-style help: C<usage> is the synopsis,
C<description> is the introductory paragraph, C<options> is an array of
C<[option label, description]> pairs, C<option_heading> names their section
(default C<Application options:>), and C<examples> contains preformatted
examples. The common MCP options are documented automatically and their
descriptions are shared by all callers. Application option descriptions
are explicit; a C<Getopt::Long> specification does not contain enough
information to write one.

Other settings in that hash, such as C<path>, C<auth> or C<url_scheme>,
are passed through to C<mcp_start>. Without C<usage>, a default synopsis
is generated. Standard C<--help> prints the expanded help and exits;
a parsing error dies with the shorter usage synopsis.
C<--print-url> resolves the same name, bind, tokens and path as
startup, prints the first accepted token in the URL and exits B<without>
starting a listener. It requires a persistently stored master secret for
derived credentials and cannot predict a port requested as zero.

All other option specifications and remaining C<@ARGV> follow the caller's
normal Getopt::Long configuration, including C<require_order> if selected.
C<--stdio> is understood by C<mcp_start> and skips HTTP configuration.
The helper deliberately does not enforce application-specific positional
arguments; C<--print-url> should not have to supply a workdir just to
print an address. It is a parser, not a second command language.

=item mcp_start %config

Starts and runs the usual server. When
C<PERL_ANYEVENT_MCP_MULTIBROKER_PROTOCOL> is C<stdio>, uses C<mcp_stdio>.
Otherwise starts HTTP without printing its URL. HTTP-capable executables
provide C<--print-url> to retrieve the URL explicitly.

The HTTP defaults are IPv4 loopback, a stable name-derived port in
16384..32767, and C</> as the endpoint path.
Without explicit C<tokens>, one server-specific token is derived from
the private global secret. The selected token authenticates either its URL
path or an
C<Authorization: Bearer TOKEN> header at the clean URL returned by
C<< $server->url (0) >>. The corresponding executable's C<--print-url>
option prints the first accepted token in its URL.

C<name> selects the C<[instance NAME]> configuration section and credential.
It defaults to the program's basename.
Named settings C<bind>, C<path>, C<url_host>, C<url_scheme> and C<tokens>
are loaded from the global configuration. Explicit C<tokens> (an ordered,
nonempty array reference of URL-safe strings) replaces the configured list
and the derived default. Every token works in the URL and bearer header.
An explicit C<bind> overrides the configured bind address. Other arguments
override these settings.

The global secret is generated automatically when needed; see
L<AnyEvent::MCP/GLOBAL CONFIGURATION>. No configuration is loaded for stdio.
HTTP startup neither prints to stdout nor changes its buffering.
C<mcp_start> does not parse C<@ARGV>; applications parse their own options.
The bundled executables use C<mcp_getoptions>, which handles shared
options and URL discovery before starting the event loop.

=item mcp_stdio %config

Creates and runs a server over stdin/stdout. Arguments override the collected
configuration. Stdout buffering is disabled. On stdin EOF, pending replies
finish and stdout drains before
this function returns. Stream errors close the connection and cancel pending
requests.

=item mcp_http %config

Creates and runs an HTTP server. For example:

   mcp_http
      host => "127.0.0.1",
      port => 31740,
      path => "/mcp/",
      tokens => ["your-long-random-secret"];

Arguments override the collected configuration. Unlike C<mcp_start>, this
function does not derive or supply authentication. B<Always> pass C<tokens>,
or explicitly pass C<auth =E<gt> "none"> when a trusted embedding layer
enforces access. Omitting both is an error, not an unauthenticated default.
It does not print a URL; use
C<on_start> for application-specific startup output. Neither function
implements OAuth or Basic authentication. See
L<AnyEvent::MCP::Server::HTTP/AUTHENTICATION> for details.

All three starters return when the server is closed or on C<SIGINT> or
C<SIGTERM>. Signal shutdown closes connections and cancels outstanding
requests. The signal watchers belong to the blocking call.

=back

=cut

package AnyEvent::MCP::Server::Simple;

use common::sense;
use AnyEvent ();
use AnyEvent::MCP ();
use AnyEvent::MCP::Server::Toolset ();
use Exporter ();

our @ISA = qw(Exporter);
our @EXPORT = qw(mcp_config mcp_tool mcp_getoptions mcp_start mcp_stdio mcp_http);

my %config;
my $toolset = AnyEvent::MCP::Server::Toolset->new;

sub _run;

sub mcp_config {
   my %kv = @_;

   $kv{instructions} = AnyEvent::MCP::_clean_text $kv{instructions}
      if exists $kv{instructions};

   @config{keys %kv} = values %kv;
}

sub mcp_tool {
   $toolset->tool (@_)
}

sub _mcp_help_row {
   my ($option, $description) = @_;
   my $start = "  $option";
   my $margin = " " x 34;
   my $line = length $start < 34 ? $start . substr ($margin, length $start) : "$start\n$margin";
   my $length = 34;
   my $out = "";

   for my $word (split /\s+/, $description) {
      if ($length > 34 && $length + 1 + length $word > 79) {
         $out .= "$line\n";
         $line = $margin;
         $length = 34;
      }
      if ($length > 34) {
         $line .= " ";
         ++$length;
      }
      $line .= $word;
      $length += length $word;
   }

   "$out$line\n"
}

sub _mcp_help {
   my ($usage, $description, $options, $option_heading, $examples) = @_;
   $usage =~ s/\n*\z/\n/;
   my $help = $usage;
   $help .= "\n$description\n" if defined $description && length $description;

   $help .= "\nCommon options:\n";
   my @common = (
      ["--name NAME", "Select named configuration (default: executable name)"],
      ["--bind ADDRESS[:PORT]", "Override the HTTP listen address or port"],
      ["--token TOKEN", "Set an accepted token (repeatable; replaces defaults)"],
      ["--stdio", "Serve MCP on stdin/stdout; other listeners may remain"],
      ["--print-url", "Print authenticated HTTP URL and exit without listening"],
      ["-h, --help", "Display this help and exit"],
   );
   $help .= _mcp_help_row (@$_) for @common;

   if ($options && @$options) {
      $help .= "\n" . ($option_heading // "Application options:") . "\n";
      $help .= _mcp_help_row (@$_) for @$options;
   }
   $help .= "\nExamples:\n$examples\n"
      if defined $examples && length $examples;

   $help
}

sub mcp_getoptions {
   require Getopt::Long;
   require AnyEvent::MCP::Config;

   my $settings = ref $_[0] eq "HASH" ? shift : {};
   my %settings = %$settings;
   my $usage = delete $settings{usage}
      // "Usage: $0 [OPTION]... [ARG]...\n";
   my $description = delete $settings{description};
   my $options = delete $settings{options};
   my $option_heading = delete $settings{option_heading};
   my $examples = delete $settings{examples};
   my %url = (%config, %settings);
   delete @url{qw(name bind stdio)};

   my ($name, $bind, $stdio, $print_url, $help, @tokens);
   Getopt::Long::GetOptions (
      AnyEvent::MCP::Config::http_getopt (\$name, \$bind, \$print_url, \@tokens),
      "stdio" => \$stdio,
      "help|h" => \$help,
      @_,
   ) or die $usage;

   if ($help) {
      print _mcp_help ($usage, $description, $options, $option_heading, $examples);
      exit;
   }

   $name = AnyEvent::MCP::Config::server_name ($name // $settings{name} // $config{name});
   my %server = (
      %settings,
      name => $name,
      (defined $bind ? (bind => $bind) : ()),
      (@tokens ? (tokens => \@tokens) : ()),
      ($stdio ? (stdio => 1) : ()),
   );

   if ($print_url) {
      my %options = (%url, (@tokens ? (tokens => \@tokens) : ()));
      my $global = AnyEvent::MCP::Config->global;
      $options{path} //= $global->{section}{"instance $name"}{path} // "/";
      if (($options{auth} || "") eq "none") {
         !exists $options{tokens} or die "Cannot combine auth => none with tokens\n";
      }
      my $selected_bind = defined $bind ? $bind : ($settings{bind} // $config{bind});
      print $global->http_url ($name, $selected_bind, %options), "\n";
      exit;
   }

   %server
}

sub mcp_start {
   require AnyEvent::MCP::Config;

   my %kv = (%config, @_);
   my $name = AnyEvent::MCP::Config::server_name ($kv{name});
   my $stdio = delete $kv{stdio};

   $kv{name} = $name;
   $kv{server_info} ||= { name => $name, version => "0" };

   return mcp_stdio (%kv)
      if $stdio || $ENV{PERL_ANYEVENT_MCP_MULTIBROKER_PROTOCOL} eq "stdio";

   my $global = AnyEvent::MCP::Config->global;

   my %http = $global->http_settings ($name, delete $kv{bind});
   delete $http{tokens} if ($kv{auth} || "") eq "none";

   %kv = (
      path => "/",
      %http,
      %kv,
   );

   mcp_http (%kv)
}

sub mcp_stdio {
   require AnyEvent::MCP::Server::JSONL;

   my %kv = (%config, @_);
   my $idle_exit = delete $kv{idle_exit};
   binmode STDIN;
   binmode STDOUT;
   my $selected = select STDOUT;
   $| = 1;
   select $selected;

   my $server = AnyEvent::MCP::Server::JSONL->new (toolsets => [$toolset], %kv);
   $server->accept (\*STDIN, \*STDOUT);

   if ($idle_exit) {
      $idle_exit =~ /\A[0-9]+(?:\.[0-9]+)?\z/ && $idle_exit > 0
         or die "invalid idle_exit seconds\n";
      if ($ENV{PERL_ANYEVENT_MCP_MULTIBROKER_PROTOCOL} eq "stdio") {
         my ($timer, $check);
         $check = sub {
            return if $server->{idle_exit_requested};
            if (grep $_->{mcp_active}, values %{$server->{connections} || {}}) {
               $timer = AnyEvent->timer (after => $idle_exit, cb => $check);
            } else {
               $server->request_idle_exit;
            }
         };
         my $schedule = sub {
            $timer = AnyEvent->timer (after => $idle_exit, cb => $check);
         };
         my $on_request = $server->{on_request};
         $server->{on_request} = sub {
            my ($server, $req) = @_;
            if ($req->{method} ne "anyevent-mcp/shutdown") {
               $server->{idle_exit_requested} = 0;
               $schedule->();
               my $reply = $req->{on_reply};
               $req->{on_reply} = sub {
                  $reply->(@_);
                  $schedule->() unless $server->{_idle_shutting_down};
               };
            }
            $on_request->(@_) if $on_request;
         };
         my $on_close = $server->{on_close};
         $server->{on_close} = sub {
            undef $timer;
            $on_close->(@_) if $on_close;
         };
         $schedule->();
      }
   }
   _run $server
}

sub mcp_http {
   require AnyEvent::MCP::Server::HTTP;

   my $server = AnyEvent::MCP::Server::HTTP->new (toolsets => [$toolset], %config, @_);
   $server->listen;
   _run $server
}

sub _run {
   my ($server) = @_;

   my $cv = AnyEvent->condvar;
   my $stopped;
   my $stop = sub { $cv->send unless $stopped++ };
   my $on_close = $server->{on_close};
   $server->{on_close} = sub {
      $on_close->(@_) if $on_close;
      $stop->();
   };

   if ($server->isa ("AnyEvent::MCP::Server::JSONL")) {
      my $on_connection_close = $server->{on_connection_close};
      $server->{on_connection_close} = sub {
         $on_connection_close->(@_) if $on_connection_close;
         $stop->();
      };
   }

   my @signals = map {
      AnyEvent->signal (signal => $_, cb => sub { $server->close })
   } qw(INT TERM);

   my $ok = eval {
      $server->event (start =>);
      $cv->recv;
      1
   };
   my $error = $@;
   $server->close;
   die $error unless $ok;
   return
}

1
Revision:	1.11
Committed:	Mon Oct 12 05:04:00 2026 UTC (4 weeks, 2 days ago) by root
Branch:	MAIN
Changes since 1.10:	+48 -1 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	=head1 NAME
2
3			AnyEvent::MCP::Server::Simple - simple function interface for MCP servers
4
5			=head1 SYNOPSIS
6
7			use AnyEvent::MCP::Server::Simple;
8
9			mcp_config
10			server_info => {
11			name => "example",
12			version => "0",
13			},
14			instructions => <<'EOF';
15			Use echo to return the supplied text.
16			EOF
17
18			mcp_tool echo =>
19			"Return the supplied text.",
20			{
21			type => "object",
22			properties => { text => { type => "string" } },
23			required => ["text"],
24			},
25			sub {
26			my ($req, $args) = @_;
27
28			$req->reply ({
29			content => [{ type => "text", text => $args->{text} }],
30			});
31			};
32
33			mcp_start;
34
35			=head1 DESCRIPTION
36
37	root	1.2	For most MCP servers, registering a few tools and starting a transport is
38			enough. This module does just that: call C<mcp_tool> to register callbacks,
39			optionally configure the server with C<mcp_config>, then start it with
40			C<mcp_start>, C<mcp_stdio> or C<mcp_http>. Registration alone does not start
41			a server or an event loop.
42	root	1.1
43			Human-readable descriptions and instructions are stripped of surrounding
44			whitespace and common indentation when registered, so indented here-documents
45			can be used naturally.
46
47			C<mcp_start>, C<mcp_stdio> and C<mcp_http> are alternative blocking entry
48	root	1.2	points for a self-contained server. They run AnyEvent until shutdown; you
49			do not start another event loop. If your application already owns the server
50			lifetime or needs several transports, use the object interfaces instead.
51
52			Simple uses L<AnyEvent::MCP::Server> and a default Toolset internally; it is
53			not a second server implementation. Applications needing custom dispatch,
54			such as a multibroker, can use the Server API directly.
55	root	1.1
56			=head1 FUNCTIONS
57
58			=over
59
60			=item mcp_config %config
61
62			Adds server configuration. Repeated calls extend or replace previously declared
63			values. C<instructions> is treated as human-readable text and normalized.
64
65			C<server_info> contains the MCP server metadata, including C<name> and
66			C<version>. C<instructions> contains guidance for the client.
67
68			C<on_request> is a synchronous hook called before dispatch:
69
70			$callback->($server, $req)
71
72			For example, an application can refresh database state before each request.
73			It does not replace dispatch or receive a completion callback. These options
74			belong to Server; Simple merely collects and passes them on.
75
76			C<on_start> is C<$callback->($server)>, called after the transport is ready
77			and before entering the event loop. It can print application startup
78			information or install watchers. C<$server> is the underlying server object.
79			The callback must not block.
80
81	root	1.11	C<idle_exit> is an optional positive idle time in seconds for spawned stdio
82			servers. With a multibroker advertising C<anyevent-mcp/multibroker> version 1,
83			Simple requests shutdown once no MCP requests have been active for that long.
84			The broker can ignore the request. HTTP servers, ordinary clients and servers
85			without this option are unaffected.
86
87	root	1.1	=item mcp_tool $name, $description, $input_schema, $callback->($req, $args)
88
89			Registers a tool named C<$name> with C<$description> and the JSON Schema
90			hash reference C<$input_schema>. C<$description> is normalized like
91			C<instructions>.
92
93			C<$callback> receives an L<AnyEvent::MCP::Server::Request> object C<$req>
94			and its C<< $req->{args} >> hash reference as C<$args>, for convenience.
95
96			Tools complete the request with C<< $req->reply ($result) >>, or use
97			C<< $req->result ($data) >> and C<< $req->error ($message) >> for convenience.
98			Request context is available directly in
99			the hash, for example C<< $req->{tool} >> and C<< $req->{server} >>.
100
101	root	1.8	=item %server_options = mcp_getoptions ({ %settings }, @getopt_options)
102
103			Parse standard server options C<--name>, C<--bind>, repeatable
104			C<--token>, C<--stdio>, C<--print-url> and C<--help> alongside any
105			application-specific L<Getopt::Long> option specifications:
106
107			my $verbose;
108			my %options = mcp_getoptions (
109	root	1.9	{
110			usage => "Usage: $0 [OPTION]... WORKDIR\n",
111			description => "Provide example tools through MCP.",
112			option_heading => "Example options:",
113			options => [
114			["--verbose", "Show additional diagnostics"],
115			],
116			examples => " $0 --stdio ./project",
117			path => "/",
118			},
119	root	1.8	"verbose!" => \$verbose,
120			);
121			@ARGV == 1 or die "workdir required\n";
122			mcp_start %options;
123
124	root	1.9	The optional leading hash defines GNU-style help: C<usage> is the synopsis,
125			C<description> is the introductory paragraph, C<options> is an array of
126			C<[option label, description]> pairs, C<option_heading> names their section
127			(default C<Application options:>), and C<examples> contains preformatted
128			examples. The common MCP options are documented automatically and their
129			descriptions are shared by all callers. Application option descriptions
130			are explicit; a C<Getopt::Long> specification does not contain enough
131			information to write one.
132
133			Other settings in that hash, such as C<path>, C<auth> or C<url_scheme>,
134			are passed through to C<mcp_start>. Without C<usage>, a default synopsis
135			is generated. Standard C<--help> prints the expanded help and exits;
136			a parsing error dies with the shorter usage synopsis.
137			C<--print-url> resolves the same name, bind, tokens and path as
138	root	1.8	startup, prints the first accepted token in the URL and exits B<without>
139			starting a listener. It requires a persistently stored master secret for
140			derived credentials and cannot predict a port requested as zero.
141
142			All other option specifications and remaining C<@ARGV> follow the caller's
143			normal Getopt::Long configuration, including C<require_order> if selected.
144			C<--stdio> is understood by C<mcp_start> and skips HTTP configuration.
145			The helper deliberately does not enforce application-specific positional
146			arguments; C<--print-url> should not have to supply a workdir just to
147			print an address. It is a parser, not a second command language.
148
149	root	1.1	=item mcp_start %config
150
151			Starts and runs the usual server. When
152			C<PERL_ANYEVENT_MCP_MULTIBROKER_PROTOCOL> is C<stdio>, uses C<mcp_stdio>.
153	root	1.4	Otherwise starts HTTP without printing its URL. HTTP-capable executables
154			provide C<--print-url> to retrieve the URL explicitly.
155	root	1.1
156	root	1.3	The HTTP defaults are IPv4 loopback, a stable name-derived port in
157			16384..32767, and C</> as the endpoint path.
158	root	1.7	Without explicit C<tokens>, one server-specific token is derived from
159			the private global secret. The selected token authenticates either its URL
160			path or an
161	root	1.5	C<Authorization: Bearer TOKEN> header at the clean URL returned by
162	root	1.6	C<< $server->url (0) >>. The corresponding executable's C<--print-url>
163			option prints the first accepted token in its URL.
164	root	1.1
165	root	1.10	C<name> selects the C<[instance NAME]> configuration section and credential.
166	root	1.3	It defaults to the program's basename.
167	root	1.5	Named settings C<bind>, C<path>, C<url_host>, C<url_scheme> and C<tokens>
168	root	1.7	are loaded from the global configuration. Explicit C<tokens> (an ordered,
169			nonempty array reference of URL-safe strings) replaces the configured list
170			and the derived default. Every token works in the URL and bearer header.
171	root	1.3	An explicit C<bind> overrides the configured bind address. Other arguments
172	root	1.7	override these settings.
173	root	1.1
174			The global secret is generated automatically when needed; see
175			L<AnyEvent::MCP/GLOBAL CONFIGURATION>. No configuration is loaded for stdio.
176	root	1.4	HTTP startup neither prints to stdout nor changes its buffering.
177	root	1.7	C<mcp_start> does not parse C<@ARGV>; applications parse their own options.
178	root	1.8	The bundled executables use C<mcp_getoptions>, which handles shared
179			options and URL discovery before starting the event loop.
180	root	1.1
181			=item mcp_stdio %config
182
183			Creates and runs a server over stdin/stdout. Arguments override the collected
184			configuration. Stdout buffering is disabled. On stdin EOF, pending replies
185			finish and stdout drains before
186			this function returns. Stream errors close the connection and cancel pending
187			requests.
188
189			=item mcp_http %config
190
191			Creates and runs an HTTP server. For example:
192
193			mcp_http
194			host => "127.0.0.1",
195			port => 31740,
196	root	1.7	path => "/mcp/",
197			tokens => ["your-long-random-secret"];
198	root	1.1
199			Arguments override the collected configuration. Unlike C<mcp_start>, this
200	root	1.8	function does not derive or supply authentication. B<Always> pass C<tokens>,
201			or explicitly pass C<auth =E<gt> "none"> when a trusted embedding layer
202			enforces access. Omitting both is an error, not an unauthenticated default.
203			It does not print a URL; use
204	root	1.7	C<on_start> for application-specific startup output. Neither function
205			implements OAuth or Basic authentication. See
206			L<AnyEvent::MCP::Server::HTTP/AUTHENTICATION> for details.
207	root	1.1
208			All three starters return when the server is closed or on C<SIGINT> or
209			C<SIGTERM>. Signal shutdown closes connections and cancels outstanding
210			requests. The signal watchers belong to the blocking call.
211
212			=back
213
214			=cut
215
216			package AnyEvent::MCP::Server::Simple;
217
218			use common::sense;
219			use AnyEvent ();
220			use AnyEvent::MCP ();
221			use AnyEvent::MCP::Server::Toolset ();
222			use Exporter ();
223
224			our @ISA = qw(Exporter);
225	root	1.8	our @EXPORT = qw(mcp_config mcp_tool mcp_getoptions mcp_start mcp_stdio mcp_http);
226	root	1.1
227			my %config;
228			my $toolset = AnyEvent::MCP::Server::Toolset->new;
229
230			sub _run;
231
232			sub mcp_config {
233			my %kv = @_;
234
235			$kv{instructions} = AnyEvent::MCP::_clean_text $kv{instructions}
236			if exists $kv{instructions};
237
238			@config{keys %kv} = values %kv;
239			}
240
241			sub mcp_tool {
242			$toolset->tool (@_)
243			}
244
245	root	1.9	sub _mcp_help_row {
246			my ($option, $description) = @_;
247			my $start = " $option";
248			my $margin = " " x 34;
249			my $line = length $start < 34 ? $start . substr ($margin, length $start) : "$start\n$margin";
250			my $length = 34;
251			my $out = "";
252
253			for my $word (split /\s+/, $description) {
254			if ($length > 34 && $length + 1 + length $word > 79) {
255			$out .= "$line\n";
256			$line = $margin;
257			$length = 34;
258			}
259			if ($length > 34) {
260			$line .= " ";
261			++$length;
262			}
263			$line .= $word;
264			$length += length $word;
265			}
266
267			"$out$line\n"
268			}
269
270			sub _mcp_help {
271			my ($usage, $description, $options, $option_heading, $examples) = @_;
272			$usage =~ s/\n*\z/\n/;
273			my $help = $usage;
274			$help .= "\n$description\n" if defined $description && length $description;
275
276			$help .= "\nCommon options:\n";
277			my @common = (
278			["--name NAME", "Select named configuration (default: executable name)"],
279			["--bind ADDRESS[:PORT]", "Override the HTTP listen address or port"],
280			["--token TOKEN", "Set an accepted token (repeatable; replaces defaults)"],
281			["--stdio", "Serve MCP on stdin/stdout; other listeners may remain"],
282			["--print-url", "Print authenticated HTTP URL and exit without listening"],
283			["-h, --help", "Display this help and exit"],
284			);
285			$help .= _mcp_help_row (@$_) for @common;
286
287			if ($options && @$options) {
288			$help .= "\n" . ($option_heading // "Application options:") . "\n";
289			$help .= _mcp_help_row (@$_) for @$options;
290			}
291			$help .= "\nExamples:\n$examples\n"
292			if defined $examples && length $examples;
293
294			$help
295			}
296
297	root	1.8	sub mcp_getoptions {
298			require Getopt::Long;
299			require AnyEvent::MCP::Config;
300
301			my $settings = ref $_[0] eq "HASH" ? shift : {};
302			my %settings = %$settings;
303			my $usage = delete $settings{usage}
304	root	1.9	// "Usage: $0 [OPTION]... [ARG]...\n";
305			my $description = delete $settings{description};
306			my $options = delete $settings{options};
307			my $option_heading = delete $settings{option_heading};
308			my $examples = delete $settings{examples};
309	root	1.8	my %url = (%config, %settings);
310			delete @url{qw(name bind stdio)};
311
312			my ($name, $bind, $stdio, $print_url, $help, @tokens);
313			Getopt::Long::GetOptions (
314			AnyEvent::MCP::Config::http_getopt (\$name, \$bind, \$print_url, \@tokens),
315			"stdio" => \$stdio,
316			"help\|h" => \$help,
317			@_,
318			) or die $usage;
319
320			if ($help) {
321	root	1.9	print _mcp_help ($usage, $description, $options, $option_heading, $examples);
322	root	1.8	exit;
323			}
324
325			$name = AnyEvent::MCP::Config::server_name ($name // $settings{name} // $config{name});
326			my %server = (
327			%settings,
328			name => $name,
329			(defined $bind ? (bind => $bind) : ()),
330			(@tokens ? (tokens => \@tokens) : ()),
331			($stdio ? (stdio => 1) : ()),
332			);
333
334			if ($print_url) {
335			my %options = (%url, (@tokens ? (tokens => \@tokens) : ()));
336			my $global = AnyEvent::MCP::Config->global;
337	root	1.10	$options{path} //= $global->{section}{"instance $name"}{path} // "/";
338	root	1.8	if (($options{auth} \|\| "") eq "none") {
339			!exists $options{tokens} or die "Cannot combine auth => none with tokens\n";
340			}
341			my $selected_bind = defined $bind ? $bind : ($settings{bind} // $config{bind});
342			print $global->http_url ($name, $selected_bind, %options), "\n";
343			exit;
344			}
345
346			%server
347			}
348
349	root	1.1	sub mcp_start {
350	root	1.3	require AnyEvent::MCP::Config;
351	root	1.1
352			my %kv = (%config, @_);
353	root	1.3	my $name = AnyEvent::MCP::Config::server_name ($kv{name});
354	root	1.8	my $stdio = delete $kv{stdio};
355	root	1.1
356			$kv{name} = $name;
357			$kv{server_info} \|\|= { name => $name, version => "0" };
358
359			return mcp_stdio (%kv)
360	root	1.8	if $stdio \|\| $ENV{PERL_ANYEVENT_MCP_MULTIBROKER_PROTOCOL} eq "stdio";
361	root	1.1
362			my $global = AnyEvent::MCP::Config->global;
363
364	root	1.8	my %http = $global->http_settings ($name, delete $kv{bind});
365			delete $http{tokens} if ($kv{auth} \|\| "") eq "none";
366
367	root	1.1	%kv = (
368			path => "/",
369	root	1.8	%http,
370	root	1.1	%kv,
371			);
372
373	root	1.4	mcp_http (%kv)
374	root	1.1	}
375
376			sub mcp_stdio {
377			require AnyEvent::MCP::Server::JSONL;
378
379	root	1.11	my %kv = (%config, @_);
380			my $idle_exit = delete $kv{idle_exit};
381	root	1.1	binmode STDIN;
382			binmode STDOUT;
383			my $selected = select STDOUT;
384			$\| = 1;
385			select $selected;
386
387	root	1.11	my $server = AnyEvent::MCP::Server::JSONL->new (toolsets => [$toolset], %kv);
388	root	1.1	$server->accept (\STDIN, \STDOUT);
389	root	1.11
390			if ($idle_exit) {
391			$idle_exit =~ /\A[0-9]+(?:\.[0-9]+)?\z/ && $idle_exit > 0
392			or die "invalid idle_exit seconds\n";
393			if ($ENV{PERL_ANYEVENT_MCP_MULTIBROKER_PROTOCOL} eq "stdio") {
394			my ($timer, $check);
395			$check = sub {
396			return if $server->{idle_exit_requested};
397			if (grep $_->{mcp_active}, values %{$server->{connections} \|\| {}}) {
398			$timer = AnyEvent->timer (after => $idle_exit, cb => $check);
399			} else {
400			$server->request_idle_exit;
401			}
402			};
403			my $schedule = sub {
404			$timer = AnyEvent->timer (after => $idle_exit, cb => $check);
405			};
406			my $on_request = $server->{on_request};
407			$server->{on_request} = sub {
408			my ($server, $req) = @_;
409			if ($req->{method} ne "anyevent-mcp/shutdown") {
410			$server->{idle_exit_requested} = 0;
411			$schedule->();
412			my $reply = $req->{on_reply};
413			$req->{on_reply} = sub {
414			$reply->(@_);
415			$schedule->() unless $server->{_idle_shutting_down};
416			};
417			}
418			$on_request->(@_) if $on_request;
419			};
420			my $on_close = $server->{on_close};
421			$server->{on_close} = sub {
422			undef $timer;
423			$on_close->(@_) if $on_close;
424			};
425			$schedule->();
426			}
427			}
428	root	1.1	_run $server
429			}
430
431			sub mcp_http {
432			require AnyEvent::MCP::Server::HTTP;
433
434			my $server = AnyEvent::MCP::Server::HTTP->new (toolsets => [$toolset], %config, @_);
435			$server->listen;
436			_run $server
437			}
438
439			sub _run {
440			my ($server) = @_;
441
442			my $cv = AnyEvent->condvar;
443			my $stopped;
444			my $stop = sub { $cv->send unless $stopped++ };
445			my $on_close = $server->{on_close};
446			$server->{on_close} = sub {
447			$on_close->(@_) if $on_close;
448			$stop->();
449			};
450
451			if ($server->isa ("AnyEvent::MCP::Server::JSONL")) {
452			my $on_connection_close = $server->{on_connection_close};
453			$server->{on_connection_close} = sub {
454			$on_connection_close->(@_) if $on_connection_close;
455			$stop->();
456			};
457			}
458
459			my @signals = map {
460			AnyEvent->signal (signal => $_, cb => sub { $server->close })
461			} qw(INT TERM);
462
463			my $ok = eval {
464			$server->event (start =>);
465			$cv->recv;
466			1
467			};
468			my $error = $@;
469			$server->close;
470			die $error unless $ok;
471			return
472			}
473
474			1