René's URL Explorer Experiment


Title: fix: correct unknown tool/prompt/resource error handling by DePasqualeOrg · Pull Request #1872 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix: correct unknown tool/prompt/resource error handling by DePasqualeOrg · Pull Request #1872 · modelcontextprotocol/python-sdk

X Title: fix: correct unknown tool/prompt/resource error handling by DePasqualeOrg · Pull Request #1872 · modelcontextprotocol/python-sdk

Description: While developing my Swift SDK for MCP, I encountered the following MCP spec compliance issue in the Python SDK: When an unknown tool is called, it throws a ToolError, which is caught by the server'...

Open Graph Description: While developing my Swift SDK for MCP, I encountered the following MCP spec compliance issue in the Python SDK: When an unknown tool is called, it throws a ToolError, which is caught by the server&...

X Description: While developing my Swift SDK for MCP, I encountered the following MCP spec compliance issue in the Python SDK: When an unknown tool is called, it throws a ToolError, which is caught by the server&...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/1872

X: @github

direct link

Domain: patch-diff.githubusercontent.com

route-pattern/_view_fragments/voltron/pull_requests/show/:user_id/:repository/:id/pull_request_layout(.:format)
route-controllervoltron_pull_requests_fragments
route-actionpull_request_layout
fetch-noncev2:34ebb3b4-af42-2a0a-e95f-6225c1108e81
current-catalog-service-hashae870bc5e265a340912cde392f23dad3671a0a881730ffdadd82f2f57d81641b
request-idD8A6:331E62:A75552F:DEF560A:696E3170
html-safe-nonce7dba5b9d90dcd80cd237ad110a26c9717034580daf4b682a11800c3a0a6354a6
visitor-payloadeyJyZWZlcnJlciI6IiIsInJlcXVlc3RfaWQiOiJEOEE2OjMzMUU2MjpBNzU1NTJGOkRFRjU2MEE6Njk2RTMxNzAiLCJ2aXNpdG9yX2lkIjoiMjM3MDM2NTM0MjU5NzY1Njk0NCIsInJlZ2lvbl9lZGdlIjoiaWFkIiwicmVnaW9uX3JlbmRlciI6ImlhZCJ9
visitor-hmac6c98dd709aacb7cb1a91d131faf3434f93f7d89e9a5da149f50f13c278ac02a1
hovercard-subject-tagpull_request:3178930789
github-keyboard-shortcutsrepository,pull-request-list,pull-request-conversation,pull-request-files-changed,copilot
google-site-verificationApib7-x98H0j5cPqHWwSMm6dNU4GmODRoqxLiDzdx9I
octolytics-urlhttps://collector.github.com/github/collect
analytics-location///voltron/pull_requests_fragments/pull_request_layout
fb:app_id1401488693436528
apple-itunes-appapp-id=1477376905, app-argument=https://github.com/_view_fragments/voltron/pull_requests/show/modelcontextprotocol/python-sdk/1872/pull_request_layout
twitter:imagehttps://opengraph.githubassets.com/dab3805ad2317fa89d585b94baa8b282dfc43b2718a2c349a92c3a8b68c611de/modelcontextprotocol/python-sdk/pull/1872
twitter:cardsummary_large_image
og:imagehttps://opengraph.githubassets.com/dab3805ad2317fa89d585b94baa8b282dfc43b2718a2c349a92c3a8b68c611de/modelcontextprotocol/python-sdk/pull/1872
og:image:altWhile developing my Swift SDK for MCP, I encountered the following MCP spec compliance issue in the Python SDK: When an unknown tool is called, it throws a ToolError, which is caught by the server&...
og:image:width1200
og:image:height600
og:site_nameGitHub
og:typeobject
og:author:usernameDePasqualeOrg
hostnamegithub.com
expected-hostnamegithub.com
None878b142339d396b81902fd0c6d3f2f41511e1864f596c5a601660d91d0d60e59
turbo-cache-controlno-preview
go-importgithub.com/modelcontextprotocol/python-sdk git https://github.com/modelcontextprotocol/python-sdk.git
octolytics-dimension-user_id182288589
octolytics-dimension-user_loginmodelcontextprotocol
octolytics-dimension-repository_id862584018
octolytics-dimension-repository_nwomodelcontextprotocol/python-sdk
octolytics-dimension-repository_publictrue
octolytics-dimension-repository_is_forkfalse
octolytics-dimension-repository_network_root_id862584018
octolytics-dimension-repository_network_root_nwomodelcontextprotocol/python-sdk
turbo-body-classeslogged-out env-production page-responsive
disable-turbofalse
browser-stats-urlhttps://api.github.com/_private/browser/stats
browser-errors-urlhttps://api.github.com/_private/browser/errors
release20fb42f07915f87665e5bccffc415f231d50cfac
ui-targetfull
theme-color#1e2327
color-schemelight dark

Links:

Skip to contenthttps://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/1872#start-of-content
https://patch-diff.githubusercontent.com/
Sign in https://patch-diff.githubusercontent.com/login?return_to=https%3A%2F%2Fgithub.com%2Fmodelcontextprotocol%2Fpython-sdk%2Fpull%2F1872
GitHub CopilotWrite better code with AIhttps://github.com/features/copilot
GitHub SparkBuild and deploy intelligent appshttps://github.com/features/spark
GitHub ModelsManage and compare promptshttps://github.com/features/models
MCP RegistryNewIntegrate external toolshttps://github.com/mcp
ActionsAutomate any workflowhttps://github.com/features/actions
CodespacesInstant dev environmentshttps://github.com/features/codespaces
IssuesPlan and track workhttps://github.com/features/issues
Code ReviewManage code changeshttps://github.com/features/code-review
GitHub Advanced SecurityFind and fix vulnerabilitieshttps://github.com/security/advanced-security
Code securitySecure your code as you buildhttps://github.com/security/advanced-security/code-security
Secret protectionStop leaks before they starthttps://github.com/security/advanced-security/secret-protection
Why GitHubhttps://github.com/why-github
Documentationhttps://docs.github.com
Bloghttps://github.blog
Changeloghttps://github.blog/changelog
Marketplacehttps://github.com/marketplace
View all featureshttps://github.com/features
Enterpriseshttps://github.com/enterprise
Small and medium teamshttps://github.com/team
Startupshttps://github.com/enterprise/startups
Nonprofitshttps://github.com/solutions/industry/nonprofits
App Modernizationhttps://github.com/solutions/use-case/app-modernization
DevSecOpshttps://github.com/solutions/use-case/devsecops
DevOpshttps://github.com/solutions/use-case/devops
CI/CDhttps://github.com/solutions/use-case/ci-cd
View all use caseshttps://github.com/solutions/use-case
Healthcarehttps://github.com/solutions/industry/healthcare
Financial serviceshttps://github.com/solutions/industry/financial-services
Manufacturinghttps://github.com/solutions/industry/manufacturing
Governmenthttps://github.com/solutions/industry/government
View all industrieshttps://github.com/solutions/industry
View all solutionshttps://github.com/solutions
AIhttps://github.com/resources/articles?topic=ai
Software Developmenthttps://github.com/resources/articles?topic=software-development
DevOpshttps://github.com/resources/articles?topic=devops
Securityhttps://github.com/resources/articles?topic=security
View all topicshttps://github.com/resources/articles
Customer storieshttps://github.com/customer-stories
Events & webinarshttps://github.com/resources/events
Ebooks & reportshttps://github.com/resources/whitepapers
Business insightshttps://github.com/solutions/executive-insights
GitHub Skillshttps://skills.github.com
Documentationhttps://docs.github.com
Customer supporthttps://support.github.com
Community forumhttps://github.com/orgs/community/discussions
Trust centerhttps://github.com/trust-center
Partnershttps://github.com/partners
GitHub SponsorsFund open source developershttps://github.com/sponsors
Security Labhttps://securitylab.github.com
Maintainer Communityhttps://maintainers.github.com
Acceleratorhttps://github.com/accelerator
Archive Programhttps://archiveprogram.github.com
Topicshttps://github.com/topics
Trendinghttps://github.com/trending
Collectionshttps://github.com/collections
Enterprise platformAI-powered developer platformhttps://github.com/enterprise
GitHub Advanced SecurityEnterprise-grade security featureshttps://github.com/security/advanced-security
Copilot for BusinessEnterprise-grade AI featureshttps://github.com/features/copilot/copilot-business
Premium SupportEnterprise-grade 24/7 supporthttps://github.com/premium-support
Pricinghttps://github.com/pricing
Search syntax tipshttps://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax
documentationhttps://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax
Sign in https://patch-diff.githubusercontent.com/login?return_to=https%3A%2F%2Fgithub.com%2Fmodelcontextprotocol%2Fpython-sdk%2Fpull%2F1872
Sign up https://patch-diff.githubusercontent.com/signup?ref_cta=Sign+up&ref_loc=header+logged+out&ref_page=%2F%3Cuser-name%3E%2F%3Crepo-name%3E%2Fvoltron%2Fpull_requests_fragments%2Fpull_request_layout&source=header-repo&source_repo=modelcontextprotocol%2Fpython-sdk
Reloadhttps://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/1872
Reloadhttps://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/1872
Reloadhttps://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/1872
modelcontextprotocol https://patch-diff.githubusercontent.com/modelcontextprotocol
python-sdkhttps://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk
Notifications https://patch-diff.githubusercontent.com/login?return_to=%2Fmodelcontextprotocol%2Fpython-sdk
Fork 3k https://patch-diff.githubusercontent.com/login?return_to=%2Fmodelcontextprotocol%2Fpython-sdk
Star 21.2k https://patch-diff.githubusercontent.com/login?return_to=%2Fmodelcontextprotocol%2Fpython-sdk
Code https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk
Issues 239 https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/issues
Pull requests 93 https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pulls
Actions https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/actions
Projects 0 https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/projects
Security Uh oh! There was an error while loading. Please reload this page. https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/security
Please reload this pagehttps://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/1872
Insights https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pulse
Code https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk
Issues https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/issues
Pull requests https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pulls
Actions https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/actions
Projects https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/projects
Security https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/security
Insights https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pulse
Sign up for GitHub https://patch-diff.githubusercontent.com/signup?return_to=%2Fmodelcontextprotocol%2Fpython-sdk%2Fissues%2Fnew%2Fchoose
terms of servicehttps://docs.github.com/terms
privacy statementhttps://docs.github.com/privacy
Sign inhttps://patch-diff.githubusercontent.com/login?return_to=%2Fmodelcontextprotocol%2Fpython-sdk%2Fissues%2Fnew%2Fchoose
Jump to bottomhttps://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/1872#issue-comment-box
DePasqualeOrghttps://patch-diff.githubusercontent.com/DePasqualeOrg
modelcontextprotocol:mainhttps://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/tree/main
DePasqualeOrg:fix/unknown-tool-protocol-errorhttps://patch-diff.githubusercontent.com/DePasqualeOrg/mcp-python-sdk/tree/fix/unknown-tool-protocol-error
fix: correct unknown tool/prompt/resource error handling https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/1872#top
DePasqualeOrghttps://patch-diff.githubusercontent.com/DePasqualeOrg
modelcontextprotocol:mainhttps://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/tree/main
DePasqualeOrg:fix/unknown-tool-protocol-errorhttps://patch-diff.githubusercontent.com/DePasqualeOrg/mcp-python-sdk/tree/fix/unknown-tool-protocol-error
Conversation 0 https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/1872
Commits 2 https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/1872/commits
Checks 22 https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/1872/checks
Files changed https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/1872/files
Please reload this pagehttps://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/1872
https://github.co/hiddenchars
https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/{{ revealButtonHref }}
https://patch-diff.githubusercontent.com/DePasqualeOrg
DePasqualeOrghttps://patch-diff.githubusercontent.com/DePasqualeOrg
Jan 15, 2026https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/1872#issue-3819347932
Swift SDKhttps://github.com/DePasqualeOrg/mcp-swift-sdk
distinguisheshttps://github.com/modelcontextprotocol/modelcontextprotocol/blob/c1e0b4d39a630fd87807602c6ace6eefc15154a5/docs/specification/2025-03-26/server/tools.mdx#error-handling
spec referencehttps://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/docs/specification/draft/server/prompts.mdx#error-handling
spec referencehttps://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/docs/specification/draft/server/resources.mdx#error-handling
MCP Documentationhttps://modelcontextprotocol.io
Please reload this pagehttps://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/1872
https://patch-diff.githubusercontent.com/DePasqualeOrg
Fix unknown tool/prompt/resource error handlinghttps://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/1872/commits/7560d3ff52531d17325ee0e3f644edc18917cf25
7560d3fhttps://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/1872/commits/7560d3ff52531d17325ee0e3f644edc18917cf25
https://patch-diff.githubusercontent.com/DePasqualeOrg
DePasqualeOrghttps://patch-diff.githubusercontent.com/DePasqualeOrg
Jan 15, 2026https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/1872#event-22080748262
https://patch-diff.githubusercontent.com/DePasqualeOrg
Merge branch 'main' into fix/unknown-tool-protocol-errorhttps://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/1872/commits/86d30376cbb29b495e288ad592a42f246068fe57
86d3037https://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/1872/commits/86d30376cbb29b495e288ad592a42f246068fe57
Sign up for freehttps://patch-diff.githubusercontent.com/join?source=comment-repo
Sign in to commenthttps://patch-diff.githubusercontent.com/login?return_to=https%3A%2F%2Fgithub.com%2Fmodelcontextprotocol%2Fpython-sdk%2Fpull%2F1872
Please reload this pagehttps://patch-diff.githubusercontent.com/modelcontextprotocol/python-sdk/pull/1872
https://patch-diff.githubusercontent.com/DePasqualeOrg
https://github.com
Termshttps://docs.github.com/site-policy/github-terms/github-terms-of-service
Privacyhttps://docs.github.com/site-policy/privacy-policies/github-privacy-statement
Securityhttps://github.com/security
Statushttps://www.githubstatus.com/
Communityhttps://github.community/
Docshttps://docs.github.com/
Contacthttps://support.github.com?tags=dotcom-footer

Viewport: width=device-width

URLs of crawlers that visited me.