tag
mcp
3 posts.
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Your agent's approval gate is probably just a warning label
We shipped plan cards, real parallel tool calls and an approval gate for an MCP agent. The gate was decoration for two days, and the fan was never parallel.
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Every copy of the rule agreed. That was the bug.
Four surfaces minted the same token four different ways, and all four agreed. How we found the drift, why the tests couldn't see it, and the guard that now can.
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Node execFile was 2.7x slower: the spawn cost nothing
Two implementations of the same memory lookup, one over a Unix socket and one shelling out to a CLI. I blamed the subprocess. The timing block said otherwise.