AI Guides › Skills & Agents
The One Question To Ask Before Giving Any Agent Write Access
By Nigel Guy · 2 min read
Granting an agent permission to act — send the email, update the record,
push the change — feels like a convenience setting. It's actually the single
biggest jump in risk in the whole skills-and-agents space, and it's usually
made with less thought than picking a font.
The rule: before granting write access to anything, ask "what's the cost
if this happens once, on the wrong input, with nobody watching" — if you
can't answer that cleanly, the agent isn't ready for write access yet.
The mechanism
- Start every agent read-only. Let it draft, recommend, and flag — have
it show you exactly what it would do before it's allowed to do it. This
alone catches most bad surprises before they cost anything.
- Promote to write access one narrow scope at a time. Not "manage my
calendar" — "add events to this one calendar, never delete or move
existing ones." Scope is doing the safety work, not the platform's
settings screen.
- Ask what the reversal looks like. If the agent does the wrong thing,
how do you undo it, and how fast? An action with a clean undo is a very
different risk from one that's out the door the moment it fires.
- Set a review cadence, not a one-time approval. Permissions granted
once and never revisited are exactly the ones that quietly outlive their
reason for existing.
- Log what it did, somewhere you'll actually look. A running record of
agent actions is what turns "I think it's been fine" into "I know it's
been fine."
What to skip
Skip granting broad, all-purpose write access "to save time later" — narrow
and re-granted is safer than broad and forgotten. And skip treating a
confirmation prompt as sufficient on its own; a confirmation you click
without reading is not a safeguard, it's a formality.
Guardrails
- Anything touching money, anything sent externally, anything irreversible —
these deserve a human in the loop regardless of how well-tested the agent
has been. Track record reduces risk; it doesn't retire the need for review
on high-stakes actions.
- "It's been right every time so far" is a description of your sample size,
not a guarantee about the next action.
- If you can't clearly state the scope you're granting in one sentence, you
don't yet understand the permission well enough to grant it.
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