The second kind of program agents commonly write is a hook: a piece of code that runs repeatedly at a certain point in the agentic loop. Pre- and post-tool-use hooks are common, as well as pre-compaction hooks. For a hook, it’s not important for it to compile quickly, but it needs to start up quickly and execute quickly, since it can get called frequently enough that a slow implementation would meaningfully drag down the user experience. Mog compiles to native code, and it can then load that machine code into the agent’s running binary. The key property that makes this safe: native code compiled by the Mog compiler can’t do anything other than what the host explicitly lets it do – not even exceed limits on memory or time. The agent can incorporate a Mog program into itself at runtime and call into it without inter-process communication overhead or process startup latency.
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The rocket was carried by a huge machine called a crawler-transporter, travelling at a top speed of 0.82 mph (1.3 km/h) as it trundled along. Live coverage captured the slow-moving spectacle.
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