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[BUG] Anthropic "prompt is too long" error not classified as ContextLengthExceededError #769

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[BUG] Anthropic "prompt is too long" error not classified as ContextLengthExceededError #769

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c5aa510
Handle 'prompt is too long' error as ContextLengthExceededError
yasming May 12, 2026
e3549ac
Merge branch 'main' into fix-prompt-is-too-long-exception
yasming May 12, 2026
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3 changes: 2 additions & 1 deletion lib/ruby_llm/error.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -69,7 +69,8 @@ class << self
/token count exceeds/i,
/input[_\s-]?token/i,
/input or output tokens? must be reduced/i,
/reduce the length of messages/i
/reduce the length of messages/i,
/prompt is too long/i
].freeze

def parse_error(provider:, response:) # rubocop:disable Metrics/PerceivedComplexity
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10 changes: 10 additions & 0 deletions spec/ruby_llm/error_middleware_spec.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -58,6 +58,16 @@
end.to raise_error(RubyLLM::ContextLengthExceededError)
end

it "maps Anthropic's 'prompt is too long' 400 error to ContextLengthExceededError" do
msg = 'prompt is too long: 209025 tokens > 200000 maximum'
response = Struct.new(:status, :body).new(400, %({"error":{"message":"#{msg}"}}))
provider = instance_double(RubyLLM::Provider, parse_error: msg)

expect do
described_class.parse_error(provider: provider, response: response)
end.to raise_error(RubyLLM::ContextLengthExceededError)
end

it 'keeps regular 400 errors as BadRequestError' do
response = Struct.new(:status, :body).new(400, '{"error":{"message":"Invalid model specified"}}')
provider = instance_double(RubyLLM::Provider, parse_error: 'Invalid model specified')
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