MCP startup spams unknown format google-duration warnings #51140
Description
Description
Every launch with the Google Monitoring MCP configured prints dozens of lines before the TUI paints:
unknown format google-duration ignored in schema at path #/$defs/Aggregation/properties/alignmentPeriod
Same for timeBinSize, minAlignmentPeriod, maxDuration and the other duration fields.
Traced to the MCP SDK Ajv validator compiling tool outputSchemas on listTools. Ajv does not know Google's google-duration format, so it warns per subschema and skips validation for those fields. Harmless but noisy, flashes over startup.
Plugins
opencode-chrome-devtools, opencode-quota
OpenCode version
1.18.32
Steps to reproduce
- Configure monitoring MCP (https://monitoring.googleapis.com/mcp)
- Launch opencode
- Observe the warning flash before the TUI paints
Screenshot and/or share link
Screenshot in original report (startup flash of repeated unknown-format lines).
Operating System
macOS 26.6.2
Terminal
VSCode integrated terminal
Activity
thdxr commentedon Oct 11, 2026
Thanks for the report! OpenCode 2.0 is now out and development is focused on V2, so we're closing issues filed against OpenCode 1. Please upgrade (
opencode upgrade --major, details: https://anoma.ly/notes/opencode-2-0), and if this is still relevant on 2.0, reopen this issue or open a new one with your 2.0 version.— from 𝕺𝖕𝖊𝖓𝕮𝖔𝖉𝖊