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Title: [v1.x] fix: reject trailing newline in tool-name validation by maxisbey · Pull Request #3086 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: [v1.x] fix: reject trailing newline in tool-name validation by maxisbey · Pull Request #3086 · modelcontextprotocol/python-sdk

X Title: [v1.x] fix: reject trailing newline in tool-name validation by maxisbey · Pull Request #3086 · modelcontextprotocol/python-sdk

Description: Backport of #3076 to v1.x. TOOL_NAME_REGEX is $-anchored and checked with re.match; in Python, $ also matches just before a single trailing newline, so a tool name like "name\n" validated cleanly with no SEP-986 warning. Switch the check to re.fullmatch, mirroring the fix merged to main. Credit to @Otis0408 for finding and fixing the original issue (#3084, #3076). Note: v1.x has no uri_template.py (that module is v2-only), so only the tool-name half of #3076 applies here. AI Disclaimer

Open Graph Description: Backport of #3076 to v1.x. TOOL_NAME_REGEX is $-anchored and checked with re.match; in Python, $ also matches just before a single trailing newline, so a tool name like "name\n" validated...

X Description: Backport of #3076 to v1.x. TOOL_NAME_REGEX is $-anchored and checked with re.match; in Python, $ also matches just before a single trailing newline, so a tool name like "name\n" v...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/3086

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c6b2fc0 fix: reject trailing newline in tool-name validation maxisbey Jul 10, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/3086/commits/c6b2fc0f20c4ab19cea030a0e3581f693dab78a3
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