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spec(mcp): define fresh server argument ownership - #98
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Generated-By: PostHog Desktop Task-Id: db1a8a08-fe03-43b6-9e49-705e8b1f375e
This was referenced Oct 5, 2026
gesh
marked this pull request as ready for review
October 7, 2026 11:59
dustinbyrne
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Oct 7, 2026
dustinbyrne
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dustinbyrne
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The fresh-instance ownership requirement and strict-schema scenario address the low-level gap while preserving tool-owned arguments and unknown-ownership fallback. The canonical specification and archived change are synchronized.
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lucasheriques
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Oct 7, 2026
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| @sdk:server @mcp_fresh_lowlevel_ownership_capable | ||
| Scenario: A fresh low-level server resolves injected argument ownership | ||
| Given automatic instrumentation creates a fresh low-level server for "tools/call" |
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question: Should this scenario say a resolver is configured? Without one, both SDKs leave the arguments in place. In the spec text, "returns the schema ... the host advertises" could also say "before SDK injection".
Generated-By: PostHog Desktop Task-Id: db1a8a08-fe03-43b6-9e49-705e8b1f375e
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Summary
Why
A fresh server can receive
tools/callwithout servingtools/list. Strict tools still need the SDK to remove its injected arguments.Reference implementation: PostHog/posthog-js#5165
Tests
openspec validate --specs --strictgit diff --checkCreated with PostHog Desktop