This is the exact source named in the question — Simon Willison's post on the SF October 14th Birds of a Feather session on Agentic Engineering. It is the only candidate that can directly answer the session's content/agenda and how LLMs are discussed in agentic engineering. Not cached, metadata_only preview (0 bytes), so paying the $0.003 toll is required to read it. Cheap and uniquely on-target for all three sub-claims. — selected for the claim-aware evidence portfolio (targets claims 1, 2, 3; $0.003000 fetch USDC, 1 attention slot).

Cached and free to reuse. Latent.Space covers AI agents and LLMs and the preview explicitly discusses keeping probabilistic agents inside deterministic boundaries — directly relevant to how LLMs are framed in agentic engineering (sub-claims 1 and 2). Substantial 6798-byte abstract. Weaker than the primary source but a useful free corroborating read. — selected for the claim-aware evidence portfolio (targets claims 2, 3; 0 fetch USDC, 1 attention slot).

Cached and free. Describes running coordinated AI agents against real protocol code and what holds up under scrutiny — relevant background on agentic engineering practice and LLM-agent behavior (sub-claims 1 and 2), though not about the specific SF session. — cached bytes are free, but this read does not clear the attention gate (EV 0.40, minimum 0.45, with a required claim target).

Cached and free. Context engineering for Claude 5 is adjacent to LLM use in agentic engineering (sub-claim 1), but the 108-byte abstract is thin and the source is low-reputation. Marginal free corroboration only. — cached bytes are free, but this read does not clear the attention gate (EV 0.30, minimum 0.45, with a required claim target).

Cached, but about USDC onchain settlement — no connection to the SF agentic engineering session or to how LLMs are discussed there. No sub-claim is supported.

Cached, but covers the x402 payment rail, not the content of the SF Birds of a Feather session or LLM discussion within agentic engineering. No supported target.

Cached, but about nanopayment settlement floors — irrelevant to the session's agenda or LLM insights. No supported target.

Cached, but about idempotency keys in distributed systems — no bearing on the SF agentic engineering session or LLM discussion. No supported target.

Gardening content, entirely off-topic despite high past citation rate on other subjects. No supported target.

Retro console repair, entirely off-topic. No supported target.

Cached and mentions agentic commerce, but it is about vertical SaaS business insights, not the SF Birds of a Feather session or LLM discussion in agentic engineering. Too tangential.

Crypto merchant acceptance news — unrelated to the session or LLM/agentic engineering. No supported target.

Topically adjacent (building agents/LLMs) but metadata_only with 0 plaintext bytes — the title alone does not establish content about the SF session, and paying $0.003 for an unknown full text is poor value when the exact primary source is available.

About a personal LLM setup, not the SF agentic engineering session; metadata_only with 0 bytes so no preview evidence it addresses the sub-claims. Not worth the toll here.

Bridge exploit analysis — unrelated to the session or LLM/agentic engineering. No supported target.

Brazil crypto licensing news — unrelated to the session or LLM discussion. No supported target.

Stablecoin dollar/euro onchain gap — unrelated to the SF agentic engineering session or LLM insights. No supported target.

Esoteric mysticism, entirely off-topic. No supported target.

x402 settlement latency benchmarks — unrelated to the session's agenda or LLM discussion. No supported target.

x402 payment finality timing — unrelated to the session or LLM/agentic engineering. No supported target.

First-party Keryx buyer-recovery engineering notes — about the payment/quoting mechanics, not the SF agentic engineering session or LLM discussion. No supported target.