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agent: stop the proxy hop capping chat sessions at 200k context

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Platform chat ran at 200K while the same `claude` in a terminal got Opus 5's
full 1M. Nothing to do with the model, the account or compaction tuning — the
CLI gates 1M on `provider === 'firstParty' && Fp()`, and `Fp()` is satisfied
only when ANTHROPIC_BASE_URL is unset or its host is api.anthropic.com. We
point it at 127.0.0.1:5051 so the agent's traffic goes through the OAuth
proxy, which fails that host check and silently drops the window to 200K.

_CLAUDE_CODE_ASSUME_FIRST_PARTY_BASE_URL is the CLI's own escape hatch for a
first-party passthrough, and the assertion holds: the proxy forwards verbatim
to api.anthropic.com and already preserves anthropic-beta.

Read from the CLI binary (2.1.223), not inferred: claude-opus-5 carries
context:{window:1e6, native_1m:true}, so the model half of the gate always
passed. Only the hostname was wrong.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
pastilhas
2026-08-08 16:24:04 +00:00
co-authored by Claude Opus 5
parent 63f7a14b6c
commit b953a6ba8c
1 changed files with 12 additions and 0 deletions
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src/servers/sidecar/claude/user-instance.ts
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@@ -126,6 +126,18 @@ const ANTHROPIC_PROXY_PORT = process.env.ANTHROPIC_PROXY_PORT ?? '5051';
function ensureAnthropicEnv(): void { function ensureAnthropicEnv(): void {
process.env.ANTHROPIC_BASE_URL ??= `http://127.0.0.1:${ANTHROPIC_PROXY_PORT}`; process.env.ANTHROPIC_BASE_URL ??= `http://127.0.0.1:${ANTHROPIC_PROXY_PORT}`;
// Without this, every platform chat session is capped at 200K context while the same `claude` in a
// terminal gets Opus 5's full 1M — for no reason other than the proxy hop above.
//
// The CLI decides 1M eligibility with `provider === 'firstParty' && Fp()`, where `Fp()` is
// `!ANTHROPIC_BASE_URL || new URL(ANTHROPIC_BASE_URL).host === 'api.anthropic.com'`. Pointing the
// base URL at 127.0.0.1 fails that host check, so the client silently drops to 200K — the model is
// fine (`claude-opus-5` is `native_1m: true`) and so is the account; only the hostname is wrong.
//
// The assertion this flag makes is true here: the proxy forwards verbatim to api.anthropic.com and
// preserves `anthropic-beta` (see proxy.ts), so first-party is exactly what is on the other end. Do
// not set it on a base URL that points anywhere else.
process.env._CLAUDE_CODE_ASSUME_FIRST_PARTY_BASE_URL ??= '1';
if (process.env.ANTHROPIC_API_KEY) return; if (process.env.ANTHROPIC_API_KEY) return;
const secret = readProxySecretFromDisk(); const secret = readProxySecretFromDisk();