
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 function $f(x) = \ln(x+1) - ax + \frac{1-a}{x+1}$ ($a \geq 2$).
1. When the tangent line of the curve $y=f(x)$ at the point $(1, f(1))$ is parallel to the line $l: y = -2x + 1$, find the value of $a$;
2. Determine the intervals of monotonicity for the function $y=f(x)$.

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