My Allowlist Was Cited in Five Design Docs and Never Read at Runtime
Thirumalaiboobathi · reddit · 2026-09-03
In opentel-mcp v0.14.0, the author discovered his METRICSAFEATTRIBUTES allowlist — cited across 14 releases and 5 ADRs as a safety mechanism — was never consulted at runtime. He wrote a test parsing every metric call site, found 2 violations, and fixed them by individual assessment rather than list-stuffing. The post also ships a redactor hook and documents an unfixed unvalidated-tool-name issue. Transferable lesson: verify something actually reads any policy you cite as a mechanism.
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