Class: A2A::Server::Middleware::LimitHistoryLength

Inherits:
Object
  • Object
show all
Defined in:
lib/a2a/server/middleware/limit_history_length.rb

Overview

Resolves the effective history length limit and sets env["a2a.history_length"] to an integer.

The server max is required. The effective limit is the minimum of the client-requested value and the server cap. When the client doesn't specify a history_length, the server cap is used.

env["a2a.history_length"] is always an Integer (0..max). The agent applies it unconditionally:

result["history"] = task[:history]&.last(limit)

Part of the A2A::Server middleware stack — the max comes from A2A::Server.new(history_length: 20).

Instance Method Summary collapse

Constructor Details

#initialize(app, max) ⇒ LimitHistoryLength

Returns a new instance of LimitHistoryLength.



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# File 'lib/a2a/server/middleware/limit_history_length.rb', line 25

def initialize(app, max)
  @app = app
  @max = max
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/a2a/server/middleware/limit_history_length.rb', line 30

def call(env)
  request = env["a2a.request"]
  limit = @max

  if request.respond_to?(:history_length) && request.history_length
    limit = [request.history_length.to_i, @max].min
  end

  env["a2a.history_length"] = limit

  @app.call(env)
end