No tools instructions in system prompt if empty tools list #4088

Job	Run time
build-and-check	2m 51s
test-.agents	47s
test-cli	48s
test-backend	44s
test-npm-app	44s
test-integration-.agents	45s
test-integration-cli	50s
test-common	45s
test-packages/agent-runtime	50s
test-integration-backend	41s
test-integration-npm-app	49s
test-web	48s
test-integration-web	44s
test-integration-common	42s
test-integration-packages/agent-runtime	42s
	13m 30s

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