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fnord
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lib/services/skill_depth.ex
defmodule Services.SkillDepth do
@moduledoc """
Tracks nested skill execution depth per process tree.
Skills can be configured to include the `skills` toolset tag, which gives them
access to the skill runner tool. This enables skill-to-skill calls.
To prevent runaway recursion, we track depth across nested calls and refuse
execution once a maximum is reached.
Depth is scoped to the current process tree via `Services.Globals`, so
concurrent skill chains (e.g., parallel delegate steps) each maintain their
own independent counter.
"""
require Logger
@type depth_result :: {:ok, non_neg_integer()} | {:error, :max_depth_reached}
@max_depth 3
@globals_key :skill_depth
@doc """
Increment depth.
Returns `{:error, :max_depth_reached}` once the configured max is exceeded.
"""
@spec inc_depth() :: depth_result
def inc_depth do
current = depth()
if current >= @max_depth do
{:error, :max_depth_reached}
else
new_depth = current + 1
Services.Globals.put_env(:fnord, @globals_key, new_depth)
{:ok, new_depth}
end
end
@doc """
Decrement depth.
"""
@spec dec_depth() :: {:ok, non_neg_integer()}
def dec_depth do
current = depth()
if current == 0 do
Logger.warning("dec_depth called at 0 (underflow), clamping to 0")
{:ok, 0}
else
new_depth = current - 1
Services.Globals.put_env(:fnord, @globals_key, new_depth)
{:ok, new_depth}
end
end
@doc """
Return current depth.
"""
@spec depth() :: non_neg_integer()
def depth do
Services.Globals.get_env(:fnord, @globals_key, 0)
end
end