
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Given the line $l$: $kx - y - 2 = 0$ and the circle $O: x^2 + y^2 = 4$, the line intersects the circle at points $A$ and $B$. Moreover, $\overrightarrow{OA} \cdot \overrightarrow{OB} = 0$. Find the value of $k$.

Present the answer in LaTex format: \boxed{Your answer}
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