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MCP resolve defs refs #13

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Merged
h3xxit merged 4 commits into from
Nov 29, 2025
Merged

MCP resolve defs refs #13

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ddc02a5
fix(mcp): resolve JSON Schema $defs references for FastMCP 2.0+ compa…
edujuan Nov 25, 2025
1f2c108
Merge pull request #12 from universal-tool-calling-protocol/fix-mcp-d…
h3xxit Nov 29, 2025
2ff556d
Update mcp plugin
h3xxit Nov 29, 2025
539efc4
resolve peer dependency issue
h3xxit Nov 29, 2025
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38 changes: 23 additions & 15 deletions bun.lock
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -29,20 +29,20 @@
},
"packages/code-mode": {
"name": "@utcp/code-mode",
"version": "1.0.0",
"version": "1.0.5",
"dependencies": {
"@utcp/sdk": "^1.0.15",
"vm2": "^3.9.19",
"@utcp/sdk": "^1.0.17",
},
"devDependencies": {
"@types/node": "^20.0.0",
"@utcp/direct-call": "^1.0.12",
"bun-types": "latest",
"typescript": "^5.0.0",
},
},
"packages/core": {
"name": "@utcp/sdk",
"version": "1.0.16",
"version": "1.0.17",
"dependencies": {
"dotenv": "^17.2.1",
"zod": "^3.23.8",
Expand All @@ -56,7 +56,7 @@
"name": "@utcp/direct-call",
"version": "1.0.12",
"dependencies": {
"@utcp/sdk": "^1.0.4",
"@utcp/sdk": "^1.0.15",
},
"devDependencies": {
"@types/bun": "latest",
Expand Down Expand Up @@ -109,14 +109,16 @@
},
"packages/mcp": {
"name": "@utcp/mcp",
"version": "1.0.12",
"version": "1.0.17",
"dependencies": {
"@apidevtools/json-schema-ref-parser": "^15.1.2",
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@cubic-dev-ai cubic-dev-ai bot Nov 29, 2025 •
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@apidevtools/json-schema-ref-parser requires @types/json-schema as a peer dependency, but @utcp/mcp never declares it, leaving the new dependency in bun.lock with an unmet peer requirement.

Prompt for AI agents 
Check if this issue is valid — if so, understand the root cause and fix it. At bun.lock, line 114:

<comment>@apidevtools/json-schema-ref-parser requires @types/json-schema as a peer dependency, but @utcp/mcp never declares it, leaving the new dependency in bun.lock with an unmet peer requirement.</comment>

<file context>
@@ -109,10 +109,11 @@
-      &quot;version&quot;: &quot;1.0.12&quot;,
+      &quot;version&quot;: &quot;1.0.16&quot;,
       &quot;dependencies&quot;: {
+        &quot;@apidevtools/json-schema-ref-parser&quot;: &quot;^15.1.2&quot;,
         &quot;@modelcontextprotocol/sdk&quot;: &quot;^1.17.4&quot;,
-        &quot;@utcp/sdk&quot;: &quot;^1.0.4&quot;,
</file context>

✅ Addressed in 539efc4

"@modelcontextprotocol/sdk": "^1.17.4",
"@utcp/sdk": "^1.0.4",
"@utcp/sdk": "^1.0.15",
"axios": "^1.11.0",
},
"devDependencies": {
"@types/bun": "latest",
"@types/json-schema": "^7.0.15",
"bun-types": "latest",
"typescript": "^5.9.2",
"zod-to-json-schema": "^3.24.6",
Expand All @@ -140,6 +142,8 @@
"zod": "^3.23.8",
},
"packages": {
"@apidevtools/json-schema-ref-parser": ["@apidevtools/json-schema-ref-parser@15.1.2", "", { "dependencies": { "js-yaml": "^4.1.1" }, "peerDependencies": { "@types/json-schema": "^7.0.15" } }, "sha512-54vnqDyGsDAVM0LOIdGMnfVyCN1NlqoGnHEGpMfaDBLMvClfT4j2XbJgvfuF0Ca0kxT6Gb7xUgS5W1I14QqjiQ=="],

"@esbuild/aix-ppc64": ["@esbuild/aix-ppc64@0.25.11", "", { "os": "aix", "cpu": "ppc64" }, "sha512-Xt1dOL13m8u0WE8iplx9Ibbm+hFAO0GsU2P34UNoDGvZYkY8ifSiy6Zuc1lYxfG7svWE2fzqCUmFp5HCn51gJg=="],

"@esbuild/android-arm": ["@esbuild/android-arm@0.25.11", "", { "os": "android", "cpu": "arm" }, "sha512-uoa7dU+Dt3HYsethkJ1k6Z9YdcHjTrSb5NUy66ZfZaSV8hEYGD5ZHbEMXnqLFlbBflLsl89Zke7CAdDJ4JI+Gg=="],
Expand Down Expand Up @@ -264,6 +268,8 @@

"@types/js-yaml": ["@types/js-yaml@4.0.9", "", {}, "sha512-k4MGaQl5TGo/iipqb2UDG2UwjXziSWkh0uysQelTlJpX1qGlpUZYm8PnO4DxG1qBomtJUdYJ6qR6xdIah10JLg=="],

"@types/json-schema": ["@types/json-schema@7.0.15", "", {}, "sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA=="],

"@types/node": ["@types/node@20.19.24", "", { "dependencies": { "undici-types": "~6.21.0" } }, "sha512-FE5u0ezmi6y9OZEzlJfg37mqqf6ZDSF2V/NLjUyGrR9uTZ7Sb9F7bLNZ03S4XVUNRWGA7Ck4c1kK+YnuWjl+DA=="],

"@types/react": ["@types/react@19.1.12", "", { "dependencies": { "csstype": "^3.0.2" } }, "sha512-cMoR+FoAf/Jyq6+Df2/Z41jISvGZZ2eTlnsaJRptmZ76Caldwy1odD4xTr/gNV9VLj0AWgg/nmkevIyUfIIq5w=="],
Expand All @@ -290,8 +296,6 @@

"acorn": ["acorn@8.15.0", "", { "bin": { "acorn": "bin/acorn" } }, "sha512-NZyJarBfL7nWwIq+FDL6Zp/yHEhePMNnnJ0y3qfieCrmNvYct8uvtiV41UvlSe6apAfk0fY1FbWx+NwfmpvtTg=="],

"acorn-walk": ["acorn-walk@8.3.4", "", { "dependencies": { "acorn": "^8.11.0" } }, "sha512-ueEepnujpqee2o5aIYnvHU6C0A42MNdsIDeqy5BydrkuC5R1ZuUFnm27EeFJGoEHJQgn3uleRvmTXaJgfXbt4g=="],

"ajv": ["ajv@6.12.6", "", { "dependencies": { "fast-deep-equal": "^3.1.1", "fast-json-stable-stringify": "^2.0.0", "json-schema-traverse": "^0.4.1", "uri-js": "^4.2.2" } }, "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g=="],

"ansi-regex": ["ansi-regex@6.2.2", "", {}, "sha512-Bq3SmSpyFHaWjPk8If9yc6svM8c56dB5BAtW4Qbw5jHTwwXXcTLoRMkpDJp6VL0XzlWaCHTXrkFURMYmD0sLqg=="],
Expand Down Expand Up @@ -620,8 +624,6 @@

"vary": ["vary@1.1.2", "", {}, "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg=="],

"vm2": ["vm2@3.10.0", "", { "dependencies": { "acorn": "^8.14.1", "acorn-walk": "^8.3.4" }, "bin": { "vm2": "bin/vm2" } }, "sha512-3ggF4Bs0cw4M7Rxn19/Cv3nJi04xrgHwt4uLto+zkcZocaKwP/nKP9wPx6ggN2X0DSXxOOIc63BV1jvES19wXQ=="],

"webidl-conversions": ["webidl-conversions@4.0.2", "", {}, "sha512-YQ+BmxuTgd6UXZW3+ICGfyqRyHXVlD5GtQr5+qjiNW7bF0cqrzX500HVXPBOvgXb5YnzDd+h0zqyv61KUD7+Sg=="],

"whatwg-url": ["whatwg-url@7.1.0", "", { "dependencies": { "lodash.sortby": "^4.7.0", "tr46": "^1.0.1", "webidl-conversions": "^4.0.2" } }, "sha512-WUu7Rg1DroM7oQvGWfOiAK21n74Gg+T4elXEQYkOhtyLeWiJFoOGLXPKI/9gzIie9CtwVLm8wtw6YJdKyxSjeg=="],
Expand All @@ -638,23 +640,29 @@

"zod-to-json-schema": ["zod-to-json-schema@3.24.6", "", { "peerDependencies": { "zod": "^3.24.1" } }, "sha512-h/z3PKvcTcTetyjl1fkj79MHNEjm+HpD6NXheWjzOekY7kV+lwDYnHw+ivHkijnCSMz1yJaWBD9vu/Fcmk+vEg=="],

"@apidevtools/json-schema-ref-parser/js-yaml": ["js-yaml@4.1.1", "", { "dependencies": { "argparse": "^2.0.1" }, "bin": { "js-yaml": "bin/js-yaml.js" } }, "sha512-qQKT4zQxXl8lLwBtHMWwaTcGfFOZviOJet3Oy/xmGk2gZH677CJM9EvtfdSkgWcATZhj/55JZ0rmy3myCT5lsA=="],

"@types/bun/bun-types": ["bun-types@1.3.0", "", { "dependencies": { "@types/node": "*" }, "peerDependencies": { "@types/react": "^19" } }, "sha512-u8X0thhx+yJ0KmkxuEo9HAtdfgCBaM/aI9K90VQcQioAmkVp3SG3FkwWGibUFz3WdXAdcsqOcbU40lK7tbHdkQ=="],

"@utcp/cli/bun-types": ["bun-types@1.3.0", "", { "dependencies": { "@types/node": "*" }, "peerDependencies": { "@types/react": "^19" } }, "sha512-u8X0thhx+yJ0KmkxuEo9HAtdfgCBaM/aI9K90VQcQioAmkVp3SG3FkwWGibUFz3WdXAdcsqOcbU40lK7tbHdkQ=="],

"@utcp/code-mode/bun-types": ["bun-types@1.3.1", "", { "dependencies": { "@types/node": "*" }, "peerDependencies": { "@types/react": "^19" } }, "sha512-NMrcy7smratanWJ2mMXdpatalovtxVggkj11bScuWuiOoXTiKIu2eVS1/7qbyI/4yHedtsn175n4Sm4JcdHLXw=="],
"@utcp/code-mode/bun-types": ["bun-types@1.3.3", "", { "dependencies": { "@types/node": "*" } }, "sha512-z3Xwlg7j2l9JY27x5Qn3Wlyos8YAp0kKRlrePAOjgjMGS5IG6E7Jnlx736vH9UVI4wUICwwhC9anYL++XeOgTQ=="],

"@utcp/direct-call/@types/bun": ["@types/bun@1.3.3", "", { "dependencies": { "bun-types": "1.3.3" } }, "sha512-ogrKbJ2X5N0kWLLFKeytG0eHDleBYtngtlbu9cyBKFtNL3cnpDZkNdQj8flVf6WTZUX5ulI9AY1oa7ljhSrp+g=="],

"@utcp/direct-call/bun-types": ["bun-types@1.3.0", "", { "dependencies": { "@types/node": "*" }, "peerDependencies": { "@types/react": "^19" } }, "sha512-u8X0thhx+yJ0KmkxuEo9HAtdfgCBaM/aI9K90VQcQioAmkVp3SG3FkwWGibUFz3WdXAdcsqOcbU40lK7tbHdkQ=="],
"@utcp/direct-call/bun-types": ["bun-types@1.3.3", "", { "dependencies": { "@types/node": "*" } }, "sha512-z3Xwlg7j2l9JY27x5Qn3Wlyos8YAp0kKRlrePAOjgjMGS5IG6E7Jnlx736vH9UVI4wUICwwhC9anYL++XeOgTQ=="],

"@utcp/dotenv-loader/bun-types": ["bun-types@1.3.1", "", { "dependencies": { "@types/node": "*" }, "peerDependencies": { "@types/react": "^19" } }, "sha512-NMrcy7smratanWJ2mMXdpatalovtxVggkj11bScuWuiOoXTiKIu2eVS1/7qbyI/4yHedtsn175n4Sm4JcdHLXw=="],

"@utcp/file/bun-types": ["bun-types@1.3.1", "", { "dependencies": { "@types/node": "*" }, "peerDependencies": { "@types/react": "^19" } }, "sha512-NMrcy7smratanWJ2mMXdpatalovtxVggkj11bScuWuiOoXTiKIu2eVS1/7qbyI/4yHedtsn175n4Sm4JcdHLXw=="],

"@utcp/http/bun-types": ["bun-types@1.3.1", "", { "dependencies": { "@types/node": "*" }, "peerDependencies": { "@types/react": "^19" } }, "sha512-NMrcy7smratanWJ2mMXdpatalovtxVggkj11bScuWuiOoXTiKIu2eVS1/7qbyI/4yHedtsn175n4Sm4JcdHLXw=="],

"@utcp/mcp/bun-types": ["bun-types@1.3.0", "", { "dependencies": { "@types/node": "*" }, "peerDependencies": { "@types/react": "^19" } }, "sha512-u8X0thhx+yJ0KmkxuEo9HAtdfgCBaM/aI9K90VQcQioAmkVp3SG3FkwWGibUFz3WdXAdcsqOcbU40lK7tbHdkQ=="],
"@utcp/mcp/@types/bun": ["@types/bun@1.3.3", "", { "dependencies": { "bun-types": "1.3.3" } }, "sha512-ogrKbJ2X5N0kWLLFKeytG0eHDleBYtngtlbu9cyBKFtNL3cnpDZkNdQj8flVf6WTZUX5ulI9AY1oa7ljhSrp+g=="],

"@utcp/mcp/bun-types": ["bun-types@1.3.3", "", { "dependencies": { "@types/node": "*" } }, "sha512-z3Xwlg7j2l9JY27x5Qn3Wlyos8YAp0kKRlrePAOjgjMGS5IG6E7Jnlx736vH9UVI4wUICwwhC9anYL++XeOgTQ=="],

"@utcp/sdk/bun-types": ["bun-types@1.3.1", "", { "dependencies": { "@types/node": "*" }, "peerDependencies": { "@types/react": "^19" } }, "sha512-NMrcy7smratanWJ2mMXdpatalovtxVggkj11bScuWuiOoXTiKIu2eVS1/7qbyI/4yHedtsn175n4Sm4JcdHLXw=="],
"@utcp/sdk/bun-types": ["bun-types@1.3.3", "", { "dependencies": { "@types/node": "*" } }, "sha512-z3Xwlg7j2l9JY27x5Qn3Wlyos8YAp0kKRlrePAOjgjMGS5IG6E7Jnlx736vH9UVI4wUICwwhC9anYL++XeOgTQ=="],

"@utcp/text/bun-types": ["bun-types@1.3.1", "", { "dependencies": { "@types/node": "*" }, "peerDependencies": { "@types/react": "^19" } }, "sha512-NMrcy7smratanWJ2mMXdpatalovtxVggkj11bScuWuiOoXTiKIu2eVS1/7qbyI/4yHedtsn175n4Sm4JcdHLXw=="],

Expand Down
93 changes: 74 additions & 19 deletions package-lock.json
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20 changes: 20 additions & 0 deletions packages/mcp/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ The `@utcp/mcp` package enables the `UtcpClient` to interact with tools defined
## Features

* **Automatic Plugin Registration**: Registers automatically when imported—no manual setup required.
* **FastMCP 2.0+ Compatibility**: Automatically resolves JSON Schema `$defs` references, ensuring compatibility with modern MCP servers built on FastMCP 2.0+.
* **MCP `CallTemplate`**: Defines the configuration for connecting to one or more MCP servers (`McpCallTemplate`), including:
* Transport type (`stdio` or `http`)
* Optional OAuth2 authentication for HTTP-based servers
Expand Down Expand Up @@ -216,6 +217,25 @@ MCP servers can expose resources (files, data sources, etc.) alongside tools. To
}
```

## FastMCP Compatibility

Starting with version 1.0.17, this plugin automatically handles JSON Schema `$defs` references used by FastMCP 2.0+ servers. This resolves the issue where tool discovery would fail with:

```
MissingRefError: can't resolve reference #/$defs/...
```

**How it works:**
- When tools are discovered from MCP servers, their input and output schemas are automatically dereferenced
- `$defs` references are resolved and inlined into the schema
- This process is transparent and requires no configuration changes
- If dereferencing fails for any reason, the original schema is used as a fallback

This ensures seamless integration with:
- `basic-memory` and other FastMCP-based servers
- Any MCP server using modern JSON Schema draft-2020-12 features
- Legacy MCP servers (which continue to work as before)

## Tool Naming Convention

Tools discovered from MCP servers follow the naming pattern:
Expand Down
4 changes: 3 additions & 1 deletion packages/mcp/package.json
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
{
"name": "@utcp/mcp",
"version": "1.0.16",
"version": "1.0.17",
"description": "Model Context Protocol integration for UTCP",
"main": "dist/index.cjs",
"module": "dist/index.js",
Expand Down Expand Up @@ -44,12 +44,14 @@
"build": "tsup"
},
"dependencies": {
"@apidevtools/json-schema-ref-parser": "^15.1.2",
"@modelcontextprotocol/sdk": "^1.17.4",
"@utcp/sdk": "^1.0.15",
"axios": "^1.11.0"
},
"devDependencies": {
"@types/bun": "latest",
"@types/json-schema": "^7.0.15",
"bun-types": "latest",
"typescript": "^5.9.2",
"zod-to-json-schema": "^3.24.6"
Expand Down
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