feat: add fetch mcp server (#242)

core/go.mod

@@ -49,7 +49,11 @@ require (
 	cloud.google.com/go/auth/oauth2adapt v0.2.8 // indirect
 	cloud.google.com/go/compute/metadata v0.7.0 // indirect
 	filippo.io/edwards25519 v1.1.0 // indirect
+	github.com/JohannesKaufmann/html-to-markdown v1.6.0 // indirect
 	github.com/KyleBanks/depth v1.2.1 // indirect
+	github.com/PuerkitoBio/goquery v1.9.2 // indirect
+	github.com/andybalholm/cascadia v1.3.3 // indirect
+	github.com/araddon/dateparse v0.0.0-20210429162001-6b43995a97de // indirect
 	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.6.10 // indirect
 	github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.34 // indirect
 	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.34 // indirect
@@ -75,8 +79,11 @@ require (
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
 	github.com/go-playground/validator/v10 v10.26.0 // indirect
+	github.com/go-shiori/dom v0.0.0-20230515143342-73569d674e1c // indirect
+	github.com/go-shiori/go-readability v0.0.0-20250217085726-9f5bf5ca7612 // indirect
 	github.com/go-sql-driver/mysql v1.9.2 // indirect
 	github.com/goccy/go-json v0.10.5 // indirect
+	github.com/gogs/chardet v0.0.0-20211120154057-b7413eaefb8f // indirect
 	github.com/google/s2a-go v0.1.9 // indirect
 	github.com/googleapis/enterprise-certificate-proxy v0.3.6 // indirect
 	github.com/googleapis/gax-go/v2 v2.14.2 // indirect
@@ -104,6 +111,7 @@ require (
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	github.com/smarty/assertions v1.15.0 // indirect
 	github.com/spf13/cast v1.8.0 // indirect
+	github.com/temoto/robotstxt v1.1.2 // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
 	github.com/ugorji/go/codec v1.2.13 // indirect
 	github.com/yosida95/uritemplate/v3 v3.0.2 // indirect

core/go.sum

@@ -8,8 +8,12 @@ cloud.google.com/go/iam v1.5.2 h1:qgFRAGEmd8z6dJ/qyEchAuL9jpswyODjA2lS+w234g8=
 cloud.google.com/go/iam v1.5.2/go.mod h1:SE1vg0N81zQqLzQEwxL2WI6yhetBdbNQuTvIKCSkUHE=
 filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
 filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
+github.com/JohannesKaufmann/html-to-markdown v1.6.0 h1:04VXMiE50YYfCfLboJCLcgqF5x+rHJnb1ssNmqpLH/k=
 github.com/KyleBanks/depth v1.2.1 h1:5h8fQADFrWtarTdtDudMmGsC7GPbOAu6RVB3ffsVFHc=
 github.com/KyleBanks/depth v1.2.1/go.mod h1:jzSb9d0L43HxTQfT+oSA1EEp2q+ne2uh6XgeJcm8brE=
+github.com/PuerkitoBio/goquery v1.9.2 h1:4/wZksC3KgkQw7SQgkKotmKljk0M6V8TUvA8Wb4yPeE=
+github.com/andybalholm/cascadia v1.3.3 h1:AG2YHrzJIm4BZ19iwJ/DAua6Btl3IwJX+VI4kktS1LM=
+github.com/araddon/dateparse v0.0.0-20210429162001-6b43995a97de h1:FxWPpzIjnTlhPwqqXc4/vE0f7GvRjuAsbW+HOIe8KnA=
 github.com/aws/aws-sdk-go-v2 v1.36.3 h1:mJoei2CxPutQVxaATCzDUjcZEjVRdpsiiXi2o38yqWM=
 github.com/aws/aws-sdk-go-v2 v1.36.3/go.mod h1:LLXuLpgzEbD766Z5ECcRmi8AzSwfZItDtmABVkRLGzg=
 github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.6.10 h1:zAybnyUQXIZ5mok5Jqwlf58/TFE7uvd3IAsa1aF9cXs=
@@ -88,6 +92,8 @@ github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJn
 github.com/go-playground/universal-translator v0.18.1/go.mod h1:xekY+UJKNuX9WP91TpwSH2VMlDf28Uj24BCp08ZFTUY=
 github.com/go-playground/validator/v10 v10.26.0 h1:SP05Nqhjcvz81uJaRfEV0YBSSSGMc/iMaVtFbr3Sw2k=
 github.com/go-playground/validator/v10 v10.26.0/go.mod h1:I5QpIEbmr8On7W0TktmJAumgzX4CA1XNl4ZmDuVHKKo=
+github.com/go-shiori/dom v0.0.0-20230515143342-73569d674e1c h1:wpkoddUomPfHiOziHZixGO5ZBS73cKqVzZipfrLmO1w=
+github.com/go-shiori/go-readability v0.0.0-20250217085726-9f5bf5ca7612 h1:BYLNYdZaepitbZreRIa9xeCQZocWmy/wj4cGIH0qyw0=
 github.com/go-sql-driver/mysql v1.7.0/go.mod h1:OXbVy3sEdcQ2Doequ6Z5BW6fXNQTmx+9S1MCJN5yJMI=
 github.com/go-sql-driver/mysql v1.9.2 h1:4cNKDYQ1I84SXslGddlsrMhc8k4LeDVj6Ad6WRjiHuU=
 github.com/go-sql-driver/mysql v1.9.2/go.mod h1:qn46aNg1333BRMNU69Lq93t8du/dwxI64Gl8i5p1WMU=
@@ -95,6 +101,7 @@ github.com/go-test/deep v1.1.1 h1:0r/53hagsehfO4bzD2Pgr/+RgHqhmf+k1Bpse2cTu1U=
 github.com/go-test/deep v1.1.1/go.mod h1:5C2ZWiW0ErCdrYzpqxLbTX7MG14M9iiw8DgHncVwcsE=
 github.com/goccy/go-json v0.10.5 h1:Fq85nIqj+gXn/S5ahsiTlK3TmC85qgirsdTP/+DeaC4=
 github.com/goccy/go-json v0.10.5/go.mod h1:oq7eo15ShAhp70Anwd5lgX2pLfOS3QCiwU/PULtXL6M=
+github.com/gogs/chardet v0.0.0-20211120154057-b7413eaefb8f h1:3BSP1Tbs2djlpprl7wCLuiqMaUh5SJkkzI2gDs+FgLs=
 github.com/golang-jwt/jwt/v5 v5.2.2 h1:Rl4B7itRWVtYIHFrSNd7vhTiz9UpLdi6gZhZ3wEeDy8=
 github.com/golang-jwt/jwt/v5 v5.2.2/go.mod h1:pqrtFR0X4osieyHYxtmOUWsAWrfe1Q5UVIyoH402zdk=
 github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
@@ -187,6 +194,8 @@ github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
 github.com/rogpeppe/go-internal v1.14.1 h1:UQB4HGPB6osV0SQTLymcB4TgvyWu6ZyliaW0tI/otEQ=
 github.com/rogpeppe/go-internal v1.14.1/go.mod h1:MaRKkUm5W0goXpeCfT7UZI6fk/L7L7so1lCWt35ZSgc=
+github.com/sebdah/goldie/v2 v2.5.3 h1:9ES/mNN+HNUbNWpVAlrzuZ7jE+Nrczbj8uFRjM7624Y=
+github.com/sergi/go-diff v1.3.1 h1:xkr+Oxo4BOQKmkn/B9eMK0g5Kg/983T9DqqPHwYqD+8=
 github.com/shopspring/decimal v1.4.0 h1:bxl37RwXBklmTi0C79JfXCEBD1cqqHt0bbgBAGFp81k=
 github.com/shopspring/decimal v1.4.0/go.mod h1:gawqmDU56v4yIKSwfBSFip1HdCCXN8/+DMd9qYNcwME=
 github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ=
@@ -217,6 +226,7 @@ github.com/swaggo/gin-swagger v1.6.0 h1:y8sxvQ3E20/RCyrXeFfg60r6H0Z+SwpTjMYsMm+z
 github.com/swaggo/gin-swagger v1.6.0/go.mod h1:BG00cCEy294xtVpyIAHG6+e2Qzj/xKlRdOqDkvq0uzo=
 github.com/swaggo/swag v1.16.4 h1:clWJtd9LStiG3VeijiCfOVODP6VpHtKdQy9ELFG3s1A=
 github.com/swaggo/swag v1.16.4/go.mod h1:VBsHJRsDvfYvqoiMKnsdwhNV9LEMHgEDZcyVYX0sxPg=
+github.com/temoto/robotstxt v1.1.2 h1:W2pOjSJ6SWvldyEuiFXNxz3xZ8aiWX5LbfDiOFd7Fxg=
 github.com/twitchyliquid64/golang-asm v0.15.1 h1:SU5vSMR7hnwNxj24w34ZyCi/FmDZTkS4MhqMhdFk5YI=
 github.com/twitchyliquid64/golang-asm v0.15.1/go.mod h1:a1lVb/DtPvCB8fslRZhAngC2+aY1QWCk3Cedj/Gdt08=
 github.com/ugorji/go/codec v1.2.13 h1:6nvAfJXxwEVFG0UdQwvobVN44a+xQAFiQajSG1Z6bU8=
@@ -224,6 +234,7 @@ github.com/ugorji/go/codec v1.2.13/go.mod h1:UNopzCgEMSXjBc6AOMqYvWC1ktqTAfzJZUZ
 github.com/yosida95/uritemplate/v3 v3.0.2 h1:Ed3Oyj9yrmi9087+NczuL5BwkIc4wvTb5zIM+UJPGz4=
 github.com/yosida95/uritemplate/v3 v3.0.2/go.mod h1:ILOh0sOhIJR3+L/8afwt/kE++YT040gmv5BQTMR2HP4=
 github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
+github.com/yuin/goldmark v1.7.1 h1:3bajkSilaCbjdKVsKdZjZCLBNPL9pYzrCakKaf4U49U=
 go.opentelemetry.io/auto/sdk v1.1.0 h1:cH53jehLUN6UFLY71z+NDOiNJqDdPRaXzTel0sJySYA=
 go.opentelemetry.io/auto/sdk v1.1.0/go.mod h1:3wSPjt5PWp2RhlCcmmOial7AvC4DQqZb7a7wCow3W8A=
 go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.61.0 h1:q4XOmH/0opmeuJtPsbFNivyl7bCt7yRBbeEm2sC/XtQ=
@@ -307,6 +318,7 @@ google.golang.org/protobuf v1.36.6/go.mod h1:jduwjTPXsFjZGTmRluh+L6NjiWu7pchiJ2/
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

go.work.sum

@@ -55,7 +55,6 @@ github.com/golang/glog v1.2.4/go.mod h1:6AhwSGph0fcJtXVM/PEHPqZlFeoLxhs7/t5UDAwm
 github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da h1:oI5xCqsCo564l8iNU+DwB5epxmsaqB+rhGL0m5jtYqE=
 github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
 github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
-github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/go-pkcs11 v0.3.0 h1:PVRnTgtArZ3QQqTGtbtjtnIkzl2iY2kt24yqbrf7td8=
 github.com/google/go-pkcs11 v0.3.0/go.mod h1:6eQoGcuNJpa7jnd5pMGdkSaQpNDYvPlXWMcjXXThLlY=
 github.com/google/gofuzz v1.0.0 h1:A8PeW59pxE9IoFRqBp37U+mSNaQoZ46F1f0f863XSXw=
@@ -63,12 +62,11 @@ github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
 github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
 github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NHg9XEKhtSvM=
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
 github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 h1:Z9n2FFNUXsshfwJMBgNA0RU6/i7WVaAegv3PtuIHPMs=
 github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51/go.mod h1:CzGEWj7cYgsdH8dAjBGEr58BoE7ScuLd+fwFZ44+/x8=
 github.com/knz/go-libedit v1.10.1 h1:0pHpWtx9vcvC0xGZqEQlQdfSQs7WRlAjuPvk3fOZDCo=
 github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
-github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
-github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/mailru/easyjson v0.7.7/go.mod h1:xzfreul335JAWq5oZzymOObrkdz5UnU4kGfJJLY9Nlc=
 github.com/neelance/astrewrite v0.0.0-20160511093645-99348263ae86 h1:D6paGObi5Wud7xg83MaEFyjxQB1W5bz5d0IFppr+ymk=
 github.com/neelance/astrewrite v0.0.0-20160511093645-99348263ae86/go.mod h1:kHJEU3ofeGjhHklVoIGuVj85JJwZ6kWPaJwCIxgnFmo=
@@ -92,8 +90,10 @@ github.com/shurcooL/vfsgen v0.0.0-20200824052919-0d455de96546/go.mod h1:TrYk7fJV
 github.com/spf13/cast v1.7.1/go.mod h1:ancEpBxwJDODSW/UG4rDrAqiKolqNNh2DX3mk86cAdo=
 github.com/spf13/cobra v1.2.1 h1:+KmjbUw1hriSNMF55oPrkZcb27aECyrj8V2ytv7kWDw=
 github.com/spf13/cobra v1.2.1/go.mod h1:ExllRjgxM/piMAM+3tAZvg8fsklGAf3tPfi+i8t68Nk=
+github.com/spf13/cobra v1.8.1/go.mod h1:wHxEcudfqmLYa8iTfL+OuZPbBZkmvliBWKIezN3kD9Y=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/spf13/pflag v1.0.6/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/spiffe/go-spiffe/v2 v2.5.0 h1:N2I01KCUkv1FAjZXJMwh95KK1ZIQLYbPfhaxw8WS0hE=
 github.com/spiffe/go-spiffe/v2 v2.5.0/go.mod h1:P+NxobPc6wXhVtINNtFjNWGBTreew1GBUCwT2wPmb7g=
 github.com/stretchr/objx v0.5.2/go.mod h1:FRsXN1f5AsAjCGJKqEizvkpNtU+EGNCLh3NxZ/8L+MA=
@@ -107,17 +107,13 @@ go.opencensus.io v0.24.0 h1:y73uSU6J157QMP2kn2r30vwW1A2W2WFwSCGnAVxeaD0=
 go.opencensus.io v0.24.0/go.mod h1:vNK8G9p7aAivkbmorf4v+7Hgx+Zs0yY+0fOtgBfjQKo=
 go.opentelemetry.io/contrib/detectors/gcp v1.34.0 h1:JRxssobiPg23otYU5SbWtQC//snGVIM3Tx6QRzlQBao=
 go.opentelemetry.io/contrib/detectors/gcp v1.34.0/go.mod h1:cV4BMFcscUR/ckqLkbfQmF0PRsq8w/lMGzdbCSveBHo=
-golang.org/x/mod v0.17.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
 golang.org/x/mod v0.21.0/go.mod h1:6SkKJ3Xj0I0BrPOZoBy3bdMptDDU9oJrpohJ3eWZ1fY=
-golang.org/x/net v0.21.0/go.mod h1:bIjVDfnllIU7BJ2DNgfnXvpSvtn8VRwhlsaeUTyUS44=
 golang.org/x/sys v0.26.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/telemetry v0.0.0-20240521205824-bda55230c457 h1:zf5N6UOrA487eEFacMePxjXAJctxKmyjKUsjA11Uzuk=
 golang.org/x/telemetry v0.0.0-20240521205824-bda55230c457/go.mod h1:pRgIJT+bRLFKnoM1ldnzKoxTIn14Yxz928LQRYYgIN0=
 golang.org/x/term v0.31.0 h1:erwDkOK1Msy6offm1mOgvspSkslFnIGsFnxOKoufg3o=
 golang.org/x/term v0.31.0/go.mod h1:R4BeIy7D95HzImkxGkTW1UQTtP54tio2RyHz7PwK0aw=
 golang.org/x/term v0.32.0/go.mod h1:uZG1FhGx848Sqfsq4/DlJr3xGGsYMu/L5GW4abiaEPQ=
-golang.org/x/tools v0.13.0/go.mod h1:HvlwmtVNQAhOuCjW7xxvovg8wbNq7LwfXh/k7wXUl58=
-golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d/go.mod h1:aiJjzUbINMkxbQROHiO6hDPo2LHcIPhhQsa9DLh0yGk=
 golang.org/x/tools v0.26.0/go.mod h1:TPVVj70c7JJ3WCazhD8OdXcZg/og+b9+tH/KxylGwH0=
 golang.org/x/xerrors v0.0.0-20231012003039-104605ab7028 h1:+cNy6SZtPcJQH3LJVLOSmiC7MMxXNOb3PU/VUEz+EhU=
 golang.org/x/xerrors v0.0.0-20231012003039-104605ab7028/go.mod h1:NDW/Ps6MPRej6fsCIbMTohpP40sJ/P/vI1MoTEGwX90=
@@ -129,8 +125,6 @@ google.golang.org/genproto/googleapis/bytestream v0.0.0-20250313205543-e70fdf4c4
 google.golang.org/genproto/googleapis/bytestream v0.0.0-20250414145226-207652e42e2e h1:OK8bKvRgTGs7U871RdjtCiRcQJLice8/rZkeoaZgnlc=
 google.golang.org/genproto/googleapis/bytestream v0.0.0-20250414145226-207652e42e2e/go.mod h1:h6yxum/C2qRb4txaZRLDHK8RyS0H/o2oEDeKY4onY/Y=
 google.golang.org/genproto/googleapis/bytestream v0.0.0-20250512202823-5a2f75b736a9/go.mod h1:h6yxum/C2qRb4txaZRLDHK8RyS0H/o2oEDeKY4onY/Y=
-gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
-gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 lukechampine.com/uint128 v1.3.0 h1:cDdUVfRwDUDovz610ABgFD17nXD4/uDgVHl2sC3+sbo=
 lukechampine.com/uint128 v1.3.0/go.mod h1:c4eWIwlEGaxC/+H1VguhU4PHXNWDCDMUlWdIWl2j1gk=
 modernc.org/cc/v3 v3.41.0 h1:QoR1Sn3YWlmA1T4vLaKZfawdVtSiGx8H+cEojbC7v1Q=

mcp-servers/fetch/README.md

@@ -0,0 +1,18 @@
+# Fetch MCP Server
+
+> <https://github.com/modelcontextprotocol/servers/tree/main/src/fetch>
+
+A Model Context Protocol server that provides web content fetching capabilities. This server enables LLMs to retrieve and process content from web pages, converting HTML to markdown for easier consumption.
+
+> [!CAUTION]
+> This server can access local/internal IP addresses and may represent a security risk. Exercise caution when using this MCP server to ensure this does not expose any sensitive data.
+
+The fetch tool will truncate the response, but by using the start_index argument, you can specify where to start the content extraction. This lets models read a webpage in chunks, until they find the information they need.
+
+## Available Tools
+
+- `fetch` - Fetches a URL from the internet and extracts its contents as markdown.
+  - `url` (string, required): URL to fetch
+  - `max_length` (integer, optional): Maximum number of characters to return (default: 5000)
+  - `start_index` (integer, optional): Start content from this character index (default: 0)
+  - `raw` (boolean, optional): Get raw content without markdown conversion (default: false)

mcp-servers/fetch/fetch.go

@@ -0,0 +1,411 @@
+package fetch
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+
+	md "github.com/JohannesKaufmann/html-to-markdown"
+	"github.com/go-shiori/go-readability"
+	mcpservers "github.com/labring/aiproxy/mcp-servers"
+	"github.com/mark3labs/mcp-go/mcp"
+	"github.com/mark3labs/mcp-go/server"
+	"github.com/temoto/robotstxt"
+)
+
+const (
+	DefaultUserAgentAutonomous = "ModelContextProtocol/1.0 (Autonomous; +https://github.com/modelcontextprotocol/servers)"
+	DefaultUserAgentManual     = "ModelContextProtocol/1.0 (User-Specified; +https://github.com/modelcontextprotocol/servers)"
+)
+
+// extractContentFromHTML extracts and converts HTML content to Markdown format
+func extractContentFromHTML(htmlContent string) string {
+	article, err := readability.FromReader(strings.NewReader(htmlContent), nil)
+	if err != nil {
+		return "<error>Page failed to be simplified from HTML</error>"
+	}
+
+	if article.Content == "" {
+		return "<error>Page failed to be simplified from HTML</error>"
+	}
+
+	converter := md.NewConverter("", true, nil)
+	markdown, err := converter.ConvertString(article.Content)
+	if err != nil {
+		return "<error>Failed to convert HTML to markdown</error>"
+	}
+
+	return markdown
+}
+
+// getRobotsTxtURL gets the robots.txt URL for a given website URL
+func getRobotsTxtURL(urlStr string) (string, error) {
+	parsedURL, err := url.Parse(urlStr)
+	if err != nil {
+		return "", err
+	}
+
+	robotsURL := &url.URL{
+		Scheme: parsedURL.Scheme,
+		Host:   parsedURL.Host,
+		Path:   "/robots.txt",
+	}
+
+	return robotsURL.String(), nil
+}
+
+// checkMayAutonomouslyFetchURL checks if the URL can be fetched according to robots.txt
+func checkMayAutonomouslyFetchURL(ctx context.Context, urlStr, userAgent, proxyURL string) error {
+	robotsTxtURL, err := getRobotsTxtURL(urlStr)
+	if err != nil {
+		return fmt.Errorf("failed to construct robots.txt URL: %w", err)
+	}
+
+	client := &http.Client{
+		Timeout: 30 * time.Second,
+	}
+
+	if proxyURL != "" {
+		proxyURLParsed, err := url.Parse(proxyURL)
+		if err != nil {
+			return fmt.Errorf("invalid proxy URL: %w", err)
+		}
+		client.Transport = &http.Transport{
+			Proxy: http.ProxyURL(proxyURLParsed),
+		}
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, robotsTxtURL, nil)
+	if err != nil {
+		return fmt.Errorf("failed to create robots.txt request: %w", err)
+	}
+	req.Header.Set("User-Agent", userAgent)
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return fmt.Errorf(
+			"failed to fetch robots.txt %s due to a connection issue: %w",
+			robotsTxtURL,
+			err,
+		)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == http.StatusUnauthorized || resp.StatusCode == http.StatusForbidden {
+		return fmt.Errorf(
+			"when fetching robots.txt (%s), received status %d so assuming that autonomous fetching is not allowed, the user can try manually fetching by using the fetch prompt",
+			robotsTxtURL,
+			resp.StatusCode,
+		)
+	}
+
+	if resp.StatusCode >= 400 && resp.StatusCode < 500 {
+		return nil // Assume robots.txt doesn't exist, allow fetching
+	}
+
+	robotsTxtBody, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return fmt.Errorf("failed to read robots.txt: %w", err)
+	}
+
+	robots, err := robotstxt.FromBytes(robotsTxtBody)
+	if err != nil {
+		return nil // If we can't parse robots.txt, allow fetching
+	}
+
+	if !robots.TestAgent(urlStr, userAgent) {
+		return fmt.Errorf(
+			`the sites robots.txt (%s) specifies that autonomous fetching of this page is not allowed
+			<useragent>%s</useragent>
+			<url>%s</url>
+			<robots>
+			%s
+			</robots>
+			The assistant must let the user know that it failed to view the page. The assistant may provide further guidance based on the above information.
+			The assistant can tell the user that they can try manually fetching the page by using the fetch prompt within their UI`,
+			robotsTxtURL,
+			userAgent,
+			urlStr,
+			string(robotsTxtBody),
+		)
+	}
+
+	return nil
+}
+
+// fetchURL fetches the URL and returns the content in a form ready for the LLM
+func fetchURL(
+	ctx context.Context,
+	urlStr, userAgent string,
+	forceRaw bool,
+	proxyURL string,
+) (string, string, error) {
+	client := &http.Client{
+		Timeout: 30 * time.Second,
+	}
+
+	if proxyURL != "" {
+		proxyURLParsed, err := url.Parse(proxyURL)
+		if err != nil {
+			return "", "", fmt.Errorf("invalid proxy URL: %w", err)
+		}
+		client.Transport = &http.Transport{
+			Proxy: http.ProxyURL(proxyURLParsed),
+		}
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, urlStr, nil)
+	if err != nil {
+		return "", "", fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("User-Agent", userAgent)
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return "", "", fmt.Errorf("failed to fetch %s: %w", urlStr, err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode >= 400 {
+		return "", "", fmt.Errorf("failed to fetch %s - status code %d", urlStr, resp.StatusCode)
+	}
+
+	pageRaw, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", "", fmt.Errorf("failed to read response body: %w", err)
+	}
+
+	contentType := resp.Header.Get("Content-Type")
+	pageRawStr := string(pageRaw)
+
+	isPageHTML := strings.Contains(pageRawStr[:min(100, len(pageRawStr))], "<html") ||
+		strings.Contains(contentType, "text/html") ||
+		contentType == ""
+
+	if isPageHTML && !forceRaw {
+		content := extractContentFromHTML(pageRawStr)
+		return content, "", nil
+	}
+
+	prefix := fmt.Sprintf(
+		"Content type %s cannot be simplified to markdown, but here is the raw content:\n",
+		contentType,
+	)
+	return pageRawStr, prefix, nil
+}
+
+// createFetchServer creates a new MCP server for fetch functionality
+func createFetchServer(
+	customUserAgent string,
+	ignoreRobotsTxt bool,
+	proxyURL string,
+) *server.MCPServer {
+	mcpServer := server.NewMCPServer("mcp-fetch", "1.0.0")
+
+	userAgentAutonomous := DefaultUserAgentAutonomous
+	userAgentManual := DefaultUserAgentManual
+
+	if customUserAgent != "" {
+		userAgentAutonomous = customUserAgent
+		userAgentManual = customUserAgent
+	}
+
+	// Add fetch tool
+	fetchTool := mcp.NewTool(
+		"fetch",
+		mcp.WithString("url", mcp.Description("URL to fetch"), mcp.Required()),
+		mcp.WithNumber("max_length",
+			mcp.Description("Maximum number of characters to return"),
+			mcp.DefaultNumber(5000)),
+		mcp.WithNumber(
+			"start_index",
+			mcp.Description(
+				"On return output starting at this character index, useful if a previous fetch was truncated and more context is required",
+			),
+			mcp.DefaultNumber(0),
+		),
+		mcp.WithBoolean(
+			"raw",
+			mcp.Description(
+				"Get the actual HTML content of the requested page, without simplification",
+			),
+			mcp.DefaultBool(false),
+		),
+		mcp.WithDescription(
+			`Fetches a URL from the internet and optionally extracts its contents as markdown.
+
+Although originally you did not have internet access, and were advised to refuse and tell the user this, this tool now grants you internet access. Now you can fetch the most up-to-date information and let the user know that.`,
+		),
+	)
+
+	mcpServer.AddTool(
+		fetchTool,
+		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
+			args := request.GetArguments()
+
+			urlStr, ok := args["url"].(string)
+			if !ok || urlStr == "" {
+				return nil, errors.New("URL is required")
+			}
+
+			maxLength := 5000
+			if ml, ok := args["max_length"].(float64); ok {
+				maxLength = int(ml)
+			}
+
+			startIndex := 0
+			if si, ok := args["start_index"].(float64); ok {
+				startIndex = int(si)
+			}
+
+			raw := false
+			if r, ok := args["raw"].(bool); ok {
+				raw = r
+			}
+
+			// Validate max_length and start_index
+			if maxLength <= 0 || maxLength >= 1000000 {
+				return nil, errors.New("max_length must be between 1 and 999999")
+			}
+
+			if startIndex < 0 {
+				return nil, errors.New("start_index must be >= 0")
+			}
+
+			// Check robots.txt if not ignored
+			if !ignoreRobotsTxt {
+				if err := checkMayAutonomouslyFetchURL(ctx, urlStr, userAgentAutonomous, proxyURL); err != nil {
+					return nil, err
+				}
+			}
+
+			// Fetch the URL
+			content, prefix, err := fetchURL(ctx, urlStr, userAgentAutonomous, raw, proxyURL)
+			if err != nil {
+				return nil, err
+			}
+
+			originalLength := len(content)
+			if startIndex >= originalLength {
+				content = "<error>No more content available.</error>"
+			} else {
+				truncatedContent := content[startIndex:]
+				if len(truncatedContent) > maxLength {
+					truncatedContent = truncatedContent[:maxLength]
+				}
+
+				if truncatedContent == "" {
+					content = "<error>No more content available.</error>"
+				} else {
+					content = truncatedContent
+					actualContentLength := len(truncatedContent)
+					remainingContent := originalLength - (startIndex + actualContentLength)
+
+					// Only add the prompt to continue fetching if there is still remaining content
+					if actualContentLength == maxLength && remainingContent > 0 {
+						nextStart := startIndex + actualContentLength
+						content += fmt.Sprintf("\n\n<error>Content truncated. Call the fetch tool with a start_index of %d to get more content.</error>", nextStart)
+					}
+				}
+			}
+
+			result := fmt.Sprintf("%sContents of %s:\n%s", prefix, urlStr, content)
+			return mcp.NewToolResultText(result), nil
+		},
+	)
+
+	// Add fetch prompt
+	fetchPrompt := mcp.NewPrompt("fetch",
+		mcp.WithPromptDescription("Fetch a URL and extract its contents as markdown"),
+		mcp.WithArgument("url", mcp.ArgumentDescription("URL to fetch"), mcp.RequiredArgument()),
+	)
+
+	mcpServer.AddPrompt(
+		fetchPrompt,
+		func(ctx context.Context, request mcp.GetPromptRequest) (*mcp.GetPromptResult, error) {
+			args := request.Params.Arguments
+			if args == nil {
+				return nil, errors.New("URL is required")
+			}
+
+			urlStr, ok := args["url"]
+			if !ok || urlStr == "" {
+				return nil, errors.New("URL is required")
+			}
+
+			content, prefix, err := fetchURL(ctx, urlStr, userAgentManual, false, proxyURL)
+			if err != nil {
+				return &mcp.GetPromptResult{
+					Description: "Failed to fetch " + urlStr,
+					Messages: []mcp.PromptMessage{
+						{
+							Role: mcp.RoleUser,
+							Content: mcp.TextContent{
+								Type: "text",
+								Text: err.Error(),
+							},
+						},
+					},
+				}, nil
+			}
+
+			return &mcp.GetPromptResult{
+				Description: "Contents of " + urlStr,
+				Messages: []mcp.PromptMessage{
+					{
+						Role: mcp.RoleUser,
+						Content: mcp.TextContent{
+							Type: "text",
+							Text: prefix + content,
+						},
+					},
+				},
+			}, nil
+		},
+	)
+
+	return mcpServer
+}
+
+var configTemplates = mcpservers.ConfigTemplates{
+	"user-agent": {
+		Name:        "user-agent",
+		Required:    mcpservers.ConfigRequiredTypeInitOptional,
+		Example:     "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
+		Description: "Custom User-Agent string to use for requests",
+	},
+	"ignore-robots": {
+		Name:        "ignore-robots",
+		Required:    mcpservers.ConfigRequiredTypeInitOptional,
+		Example:     "true",
+		Description: "Whether to ignore robots.txt restrictions",
+		Validator: func(value string) error {
+			_, err := strconv.ParseBool(value)
+			return err
+		},
+	},
+	"proxy": {
+		Name:        "proxy",
+		Required:    mcpservers.ConfigRequiredTypeInitOptional,
+		Example:     "http://127.0.0.1:7890",
+		Description: "Proxy URL to use for requests",
+		Validator: func(value string) error {
+			_, err := url.Parse(value)
+			return err
+		},
+	},
+}
+
+func NewServer(config, _ map[string]string) (mcpservers.Server, error) {
+	customUserAgent := config["user-agent"]
+	ignoreRobotsTxt, _ := strconv.ParseBool(config["ignore-robots"])
+	proxyURL := config["proxy"]
+
+	return createFetchServer(customUserAgent, ignoreRobotsTxt, proxyURL), nil
+}

mcp-servers/fetch/init.go

@@ -0,0 +1,24 @@
+package fetch
+
+import (
+	_ "embed"
+
+	mcpservers "github.com/labring/aiproxy/mcp-servers"
+)
+
+//go:embed README.md
+var readme string
+
+func init() {
+	mcpservers.Register(
+		mcpservers.NewMcp(
+			"fetch",
+			"Fetch",
+			mcpservers.McpTypeEmbed,
+			mcpservers.WithNewServerFunc(NewServer),
+			mcpservers.WithConfigTemplates(configTemplates),
+			mcpservers.WithTags([]string{"fetch", "web", "html", "markdown"}),
+			mcpservers.WithReadme(readme),
+		),
+	)
+}

mcp-servers/go.mod

@@ -3,14 +3,20 @@ module github.com/labring/aiproxy/mcp-servers
 go 1.24
 
 require (
+	github.com/JohannesKaufmann/html-to-markdown v1.6.0
 	github.com/bytedance/sonic v1.13.2
+	github.com/go-shiori/go-readability v0.0.0-20250217085726-9f5bf5ca7612
 	github.com/labring/aiproxy/core v0.0.0-20250527101240-aac8e89068ad
 	github.com/labring/aiproxy/openapi-mcp v0.0.0-20250527101240-aac8e89068ad
 	github.com/mark3labs/mcp-go v0.30.0
+	github.com/temoto/robotstxt v1.1.2
 )
 
 require (
 	github.com/KyleBanks/depth v1.2.1 // indirect
+	github.com/PuerkitoBio/goquery v1.9.2 // indirect
+	github.com/andybalholm/cascadia v1.3.3 // indirect
+	github.com/araddon/dateparse v0.0.0-20210429162001-6b43995a97de // indirect
 	github.com/bytedance/sonic/loader v0.2.4 // indirect
 	github.com/cloudwego/base64x v0.1.5 // indirect
 	github.com/getkin/kin-openapi v0.132.0 // indirect
@@ -18,6 +24,8 @@ require (
 	github.com/go-openapi/jsonreference v0.21.0 // indirect
 	github.com/go-openapi/spec v0.21.0 // indirect
 	github.com/go-openapi/swag v0.23.1 // indirect
+	github.com/go-shiori/dom v0.0.0-20230515143342-73569d674e1c // indirect
+	github.com/gogs/chardet v0.0.0-20211120154057-b7413eaefb8f // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.10 // indirect
@@ -32,7 +40,9 @@ require (
 	github.com/ugorji/go/codec v1.2.13 // indirect
 	github.com/yosida95/uritemplate/v3 v3.0.2 // indirect
 	golang.org/x/arch v0.17.0 // indirect
+	golang.org/x/net v0.40.0 // indirect
 	golang.org/x/sys v0.33.0 // indirect
+	golang.org/x/text v0.25.0 // indirect
 	golang.org/x/tools v0.33.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

mcp-servers/go.sum

@@ -1,5 +1,14 @@
+github.com/JohannesKaufmann/html-to-markdown v1.6.0 h1:04VXMiE50YYfCfLboJCLcgqF5x+rHJnb1ssNmqpLH/k=
+github.com/JohannesKaufmann/html-to-markdown v1.6.0/go.mod h1:NUI78lGg/a7vpEJTz/0uOcYMaibytE4BUOQS8k78yPQ=
 github.com/KyleBanks/depth v1.2.1 h1:5h8fQADFrWtarTdtDudMmGsC7GPbOAu6RVB3ffsVFHc=
 github.com/KyleBanks/depth v1.2.1/go.mod h1:jzSb9d0L43HxTQfT+oSA1EEp2q+ne2uh6XgeJcm8brE=
+github.com/PuerkitoBio/goquery v1.9.2 h1:4/wZksC3KgkQw7SQgkKotmKljk0M6V8TUvA8Wb4yPeE=
+github.com/PuerkitoBio/goquery v1.9.2/go.mod h1:GHPCaP0ODyyxqcNoFGYlAprUFH81NuRPd0GX3Zu2Mvk=
+github.com/andybalholm/cascadia v1.3.2/go.mod h1:7gtRlve5FxPPgIgX36uWBX58OdBsSS6lUvCFb+h7KvU=
+github.com/andybalholm/cascadia v1.3.3 h1:AG2YHrzJIm4BZ19iwJ/DAua6Btl3IwJX+VI4kktS1LM=
+github.com/andybalholm/cascadia v1.3.3/go.mod h1:xNd9bqTn98Ln4DwST8/nG+H0yuB8Hmgu1YHNnWw0GeA=
+github.com/araddon/dateparse v0.0.0-20210429162001-6b43995a97de h1:FxWPpzIjnTlhPwqqXc4/vE0f7GvRjuAsbW+HOIe8KnA=
+github.com/araddon/dateparse v0.0.0-20210429162001-6b43995a97de/go.mod h1:DCaWoUhZrYW9p1lxo/cm8EmUOOzAPSEZNGF2DK1dJgw=
 github.com/bytedance/sonic v1.13.2 h1:8/H1FempDZqC4VqjptGo14QQlJx8VdZJegxs6wwfqpQ=
 github.com/bytedance/sonic v1.13.2/go.mod h1:o68xyaF9u2gvVBuGHPlUVCy+ZfmNNO5ETf1+KgkJhz4=
 github.com/bytedance/sonic/loader v0.1.1/go.mod h1:ncP89zfokxS5LZrJxl5z0UJcsk4M4yY2JpfqGeCtNLU=
@@ -23,8 +32,15 @@ github.com/go-openapi/spec v0.21.0 h1:LTVzPc3p/RzRnkQqLRndbAzjY0d0BCL72A6j3CdL9Z
 github.com/go-openapi/spec v0.21.0/go.mod h1:78u6VdPw81XU44qEWGhtr982gJ5BWg2c0I5XwVMotYk=
 github.com/go-openapi/swag v0.23.1 h1:lpsStH0n2ittzTnbaSloVZLuB5+fvSY/+hnagBjSNZU=
 github.com/go-openapi/swag v0.23.1/go.mod h1:STZs8TbRvEQQKUA+JZNAm3EWlgaOBGpyFDqQnDHMef0=
+github.com/go-shiori/dom v0.0.0-20230515143342-73569d674e1c h1:wpkoddUomPfHiOziHZixGO5ZBS73cKqVzZipfrLmO1w=
+github.com/go-shiori/dom v0.0.0-20230515143342-73569d674e1c/go.mod h1:oVDCh3qjJMLVUSILBRwrm+Bc6RNXGZYtoh9xdvf1ffM=
+github.com/go-shiori/go-readability v0.0.0-20250217085726-9f5bf5ca7612 h1:BYLNYdZaepitbZreRIa9xeCQZocWmy/wj4cGIH0qyw0=
+github.com/go-shiori/go-readability v0.0.0-20250217085726-9f5bf5ca7612/go.mod h1:wgqthQa8SAYs0yyljVeCOQlZ027VW5CmLsbi9jWC08c=
 github.com/go-test/deep v1.1.1 h1:0r/53hagsehfO4bzD2Pgr/+RgHqhmf+k1Bpse2cTu1U=
 github.com/go-test/deep v1.1.1/go.mod h1:5C2ZWiW0ErCdrYzpqxLbTX7MG14M9iiw8DgHncVwcsE=
+github.com/gogs/chardet v0.0.0-20211120154057-b7413eaefb8f h1:3BSP1Tbs2djlpprl7wCLuiqMaUh5SJkkzI2gDs+FgLs=
+github.com/gogs/chardet v0.0.0-20211120154057-b7413eaefb8f/go.mod h1:Pcatq5tYkCW2Q6yrR2VRHlbHpZ/R4/7qyL1TCF7vl14=
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@@ -35,8 +51,11 @@ github.com/klauspost/cpuid/v2 v2.0.9/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa02
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@@ -47,6 +66,7 @@ github.com/mailru/easyjson v0.9.0 h1:PrnmzHw7262yW8sTBwxi1PdJA3Iw/EKBa8psRf7d9a4
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@@ -55,15 +75,25 @@ github.com/oasdiff/yaml3 v0.0.0-20250309153720-d2182401db90 h1:bQx3WeLcUWy+RletI
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@@ -72,25 +102,108 @@ github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOf
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mcp-servers/mcpregister/init.go

@@ -5,5 +5,6 @@ import (
 	_ "github.com/labring/aiproxy/mcp-servers/aiproxy-openapi"
 	_ "github.com/labring/aiproxy/mcp-servers/alipay"
 	_ "github.com/labring/aiproxy/mcp-servers/amap"
+	_ "github.com/labring/aiproxy/mcp-servers/fetch"
 	_ "github.com/labring/aiproxy/mcp-servers/web-search"
 )