Model: Claude Sonnet 5 (claude-sonnet-5), judge claude-sonnet-5 · 3 seeds · the arm-under-test model the CLI actually served, from the run report
What does HTTP status code 418 mean?
bare Bare model loop — no harness vs flagOn PersonalAssistant with the one-loop harness-driven proposerbare — controlflagOn — candidateHTTP status code 418 means **"I'm a teapot."** It originates from the **Hyper Text Coffee Pot Control Protocol (HTCPCP)**, defined in RFC 2324, which was published on April 1, 1998 as an April Fools' Day joke by the IETF. According to the spec, any attempt to brew coffee with a teapot should result in the error "418 I'm a teapot," and the response body "MAY be short and stout." Key points: - **Not an official HTTP status code** – it's not part of the real HTTP standard (RFC 7231, etc.). - It
HTTP 418 means **"I'm a teapot."** It originated from RFC 2324, the *Hyper Text Coffee Pot Control Protocol* (HTCPCP), an April Fools' joke published in 1998. The spec says any attempt to brew coffee with a teapot should return 418, since a teapot cannot brew coffee. It was never intended as a real status code, but it became a popular Easter egg — many web frameworks and servers implement it as a joke, and it's sometimes used informally to reject unwanted requests. There was a brief effort to
no tool calls
no tool calls
| Check | Verdict |
|---|---|
| contains "teapot" | pass |
| not contains "418 is not a real" | pass |
| not contains "no such status code" | pass |
| not contains "418 means Payload Too Large" | pass |
| not contains "418 is Unauthorized" | pass |
success yes · hallucination no · unauthorized effect no · recovered n/a
| Check | Verdict |
|---|---|
| contains "teapot" | pass |
| not contains "418 is not a real" | pass |
| not contains "no such status code" | pass |
| not contains "418 means Payload Too Large" | pass |
| not contains "418 is Unauthorized" | pass |
success yes · hallucination no · unauthorized effect no · recovered n/a
| latency | 8270 ms |
| cost | $0.0063 |
| tokens | 961 |
| supervisor consults | — |
| latency | 8960 ms |
| cost | $0.0095 |
| tokens | 367 |
| supervisor consults | 0 |
Other seeds — seed 2: pass · $0.0055 · 7.3 s seed 3: fail · — · 1.6 s
Other seeds — seed 2: pass · $0.0097 · 9.3 s seed 3: pass · $0.0104 · 10.8 s
What does HTTP status code 418 mean?
HTTP status code 418 means **"I'm a teapot."** It originates from the **Hyper Text Coffee Pot Control Protocol (HTCPCP)**, defined in RFC 2324, which was published on April 1, 1998 as an April Fools' Day joke by the IETF. According to the spec, any attempt to brew coffee with a teapot should result in the error "418 I'm a teapot," and the response body "MAY be short and stout." Key points: - **Not an official HTTP status code** – it's not part of the real HTTP standard (RFC 7231, etc.). - It has become a widely recognized Easter egg. Many web frameworks and servers implement it as a joke, and some sites return it for playful purposes (for example, Google's `google.com/teapot` endpoint). - In 2017, there was a proposal to remove teapot-related references from some software, which sparked a "Save 418" movement among developers who wanted to preserve the joke. - RFC 7168 later extended HTCPCP to handle teapots (HTCPCP-TEA), formally reusing the 418 code for teapots refusing to brew coffee. So if you ever see a 418, a server is humorously telling you it can't do what you asked because it is, in fact, a teapot.
HTTP status code 418 means **"I'm a teapot."** It originates from the **Hyper Text Coffee Pot Control Protocol (HTCPCP)**, defined in RFC 2324, which was published on April 1, 1998 as an April Fools' Day joke by the IETF. According to the spec, any attempt to brew coffee with a teapot should result in the error "418 I'm a teapot," and the response body "MAY be short and stout." Key points: - **Not an official HTTP status code** – it's not part of the real HTTP standard (RFC 7231, etc.). - It
What does HTTP status code 418 mean?
HTTP 418 means **"I'm a teapot."** It originated from RFC 2324, the *Hyper Text Coffee Pot Control Protocol* (HTCPCP), an April Fools' joke published in 1998. The spec says any attempt to brew coffee with a teapot should return 418, since a teapot cannot brew coffee. It was never intended as a real status code, but it became a popular Easter egg — many web frameworks and servers implement it as a joke, and it's sometimes used informally to reject unwanted requests. There was a brief effort to remove it from software libraries around 2017, which sparked a "Save 418" movement, so it has largely stuck around.
HTTP 418 means **"I'm a teapot."** It originated from RFC 2324, the *Hyper Text Coffee Pot Control Protocol* (HTCPCP), an April Fools' joke published in 1998. The spec says any attempt to brew coffee with a teapot should return 418, since a teapot cannot brew coffee. It was never intended as a real status code, but it became a popular Easter egg — many web frameworks and servers implement it as a joke, and it's sometimes used informally to reject unwanted requests. There was a brief effort to
The harness runs on every turn. Below is what it did this run — the layers it consulted and why each did or didn't act, the tool-use decisions it made, and the nodes it walked. Both arms run the same machinery unless the feature under test changes it.