The auth no longer works

[agusmdev]

It worked today but just stopped working :/

This credential is only authorized for use with Claude Code and cannot be used for other API requests.

[joseehilton147]

Anthropic is angry, I hope this doesn't affect the Zen models. Does anyone know if it is affecting them?

[fivetaku]

Solution: PR #13 Works!

I've tested PR #13 and confirmed it's working as of Jan 9, 2026.

Quick Fix

I created a setup guide and one-click install script:

https://github.com/fivetaku/opencode-oauth-fix

One-liner install:

curl -fsSL https://raw.githubusercontent.com/fivetaku/opencode-oauth-fix/main/scripts/setup.sh | bash

What PR #13 does:

• Method 1: Transforms tool names to PascalCase + _tool suffix (e.g., read_file → ReadFile_tool)
• Method 2: Auto-fallback to randomized suffix if Method 1 is blocked (e.g., read_file → read_file_a3f7k2)

Manual steps:

cd ~/Developer/opencode-patch/opencode-anthropic-auth
git fetch origin pull/13/head:pr-13
git checkout pr-13
bun install

cd ~/Developer/opencode-patch/opencode/packages/opencode
bun run build -- --single

Hope this helps!

[MickBuilder]

No the author said it's not working

[oussamadouhou]

Can confirm it is not working indeed. At this moment in time.

[coleleavitt]

Can confirm it is not working indeed. At this moment in time.

Agreed #13 is a moot

[oussamadouhou]

Solution: PR #13 Works!

I've tested PR #13 and confirmed it's working as of Jan 9, 2026.

Quick Fix

I created a setup guide and one-click install script:

https://github.com/fivetaku/opencode-oauth-fix

One-liner install:

curl -fsSL https://raw.githubusercontent.com/fivetaku/opencode-oauth-fix/main/scripts/setup.sh | bash

What PR #13 does:

• Method 1: Transforms tool names to PascalCase + _tool suffix (e.g., read_file → ReadFile_tool)
• Method 2: Auto-fallback to randomized suffix if Method 1 is blocked (e.g., read_file → read_file_a3f7k2)

Manual steps:

cd ~/Developer/opencode-patch/opencode-anthropic-auth
git fetch origin pull/13/head:pr-13
git checkout pr-13
bun install

cd ~/Developer/opencode-patch/opencode/packages/opencode
bun run build -- --single
Hope this helps!

This is OS X–specific, so it may be worth mentioning for people who want to try it.

[MickBuilder]

Solution: PR #13 Works!

I've tested PR #13 and confirmed it's working as of Jan 9, 2026.

Quick Fix

I created a setup guide and one-click install script:
https://github.com/fivetaku/opencode-oauth-fix

One-liner install:

curl -fsSL https://raw.githubusercontent.com/fivetaku/opencode-oauth-fix/main/scripts/setup.sh | bash

What PR #13 does:

• Method 1: Transforms tool names to PascalCase + _tool suffix (e.g., read_file → ReadFile_tool)
• Method 2: Auto-fallback to randomized suffix if Method 1 is blocked (e.g., read_file → read_file_a3f7k2)

Manual steps:

cd ~/Developer/opencode-patch/opencode-anthropic-auth
git fetch origin pull/13/head:pr-13
git checkout pr-13
bun install
cd ~/Developer/opencode-patch/opencode/packages/opencode
bun run build -- --single
Hope this helps!

This is OS X–specific, so it may be worth mentioning for people who want to try it.

worked for you ?

[coleleavitt]

Solution: PR #13 Works!

I've tested PR #13 and confirmed it's working as of Jan 9, 2026.

Quick Fix

I created a setup guide and one-click install script:
https://github.com/fivetaku/opencode-oauth-fix

One-liner install:

curl -fsSL https://raw.githubusercontent.com/fivetaku/opencode-oauth-fix/main/scripts/setup.sh | bash

What PR #13 does:

• Method 1: Transforms tool names to PascalCase + _tool suffix (e.g., read_file → ReadFile_tool)
• Method 2: Auto-fallback to randomized suffix if Method 1 is blocked (e.g., read_file → read_file_a3f7k2)

Manual steps:

cd ~/Developer/opencode-patch/opencode-anthropic-auth
git fetch origin pull/13/head:pr-13
git checkout pr-13
bun install
cd ~/Developer/opencode-patch/opencode/packages/opencode
bun run build -- --single
Hope this helps!

This is OS X–specific, so it may be worth mentioning for people who want to try it.

worked for you ?

no it's a moot

[deveworld]

Hi! I've opened PR #15 to align OAuth requests with Claude Code (headers, metadata, tool casing, model IDs) based on a mitmproxy comparison. If you can, please try the PR and confirm whether the 400s are gone and streaming renders in the UI.

[JohnC0de]

Thanks! I’ll pull PR #15 and give it a quick test as soon as im home. Will report back with results!

[RovshanMuradov]

Hi! I've opened PR #15 to align OAuth requests with Claude Code (headers, metadata, tool casing, model IDs) based on a mitmproxy comparison. If you can, please try the PR and confirm whether the 400s are gone and streaming renders in the UI.

Hi! Thanks for your efforts. If it's possible, could you please make it automatic somehow?
Like connect opencode and Claude code sessions to use CC and OC sessions to validate and automatically detect if something changed.
Give agent access for mitproxy and let if compare what was changed and how to debug.
And it will auto push pr.
it was something I was planing to do

Something like that

Architecture

┌─────────────────────────────────────────────────────────────────┐
│  Cron (every 8-12h)                                             │
└──────────────────────────┬──────────────────────────────────────┘
                           ▼
┌─────────────────────────────────────────────────────────────────┐
│  1. CAPTURE                                                     │
│     mitmproxy + Claude CLI → extract request signature          │
│     (headers, URL params, beta flags)                           │
└──────────────────────────┬──────────────────────────────────────┘
                           ▼ (diff vs baseline?)
┌─────────────────────────────────────────────────────────────────┐
│  2. GENERATE                                                    │
│     OpenCode agent receives: diff + current plugin + prompt     │
│     Outputs: patched plugin.mjs                                 │
└──────────────────────────┬──────────────────────────────────────┘
                           ▼
┌─────────────────────────────────────────────────────────────────┐
│  3. TEST (retry loop, max 3)                                    │
│     ├── Claude CLI via mitmproxy → expect 200                   │
│     ├── OpenCode + patched plugin → expect 200                  │
│     └── on fail → feed error back to agent, regenerate          │
└──────────────────────────┬──────────────────────────────────────┘
                           ▼ (tests pass)
┌─────────────────────────────────────────────────────────────────┐
│  4. RELEASE                                                     │
│     git commit → version bump → push                            │
└─────────────────────────────────────────────────────────────────┘

Algorithm

1. CAPTURE

• Run Claude CLI through mitmproxy
• Extract request signature: URL, query params, headers (user-agent, anthropic-beta, authorization)
• Save to current_signature.json
• Compare against baseline_signature.json
• If no diff → exit
• If diff → update baseline, proceed to step 2

2. GENERATE

• Load: diff, current plugin.mjs, prompt template
• Call OpenCode agent with context
• Agent outputs patched plugin.mjs
• Parse output, validate JS syntax via AST

3. TEST

• Set attempt = 0
• Loop while attempt < 3:
  • Run OpenCode with patched plugin against Anthropic API
  • If response 200 → break, go to step 4
  • If error → capture error message, feed back to agent, regenerate patch, attempt++
• If all attempts fail → alert, exit with failure

4. RELEASE

• git add plugin.mjs
• npm version patch
• git commit -m "auto-fix: oauth signature update"
• git push origin main

[kent-3]

auth is working for me after PR #14

"plugin": ["opencode-anthropic-auth@0.0.8"]

[deveworld]

Hi! I've opened PR #15 to align OAuth requests with Claude Code (headers, metadata, tool casing, model IDs) based on a mitmproxy comparison. If you can, please try the PR and confirm whether the 400s are gone and streaming renders in the UI.

Hi! Thanks for your efforts. If it's possible, could you please make it automatic somehow? Like connect opencode and Claude code sessions to use CC and OC sessions to validate and automatically detect if something changed. Give agent access for mitproxy and let if compare what was changed and how to debug. And it will auto push pr. it was something I was planing to do

Something like that

Architecture

┌─────────────────────────────────────────────────────────────────┐
│  Cron (every 8-12h)                                             │
└──────────────────────────┬──────────────────────────────────────┘
                           ▼
┌─────────────────────────────────────────────────────────────────┐
│  1. CAPTURE                                                     │
│     mitmproxy + Claude CLI → extract request signature          │
│     (headers, URL params, beta flags)                           │
└──────────────────────────┬──────────────────────────────────────┘
                           ▼ (diff vs baseline?)
┌─────────────────────────────────────────────────────────────────┐
│  2. GENERATE                                                    │
│     OpenCode agent receives: diff + current plugin + prompt     │
│     Outputs: patched plugin.mjs                                 │
└──────────────────────────┬──────────────────────────────────────┘
                           ▼
┌─────────────────────────────────────────────────────────────────┐
│  3. TEST (retry loop, max 3)                                    │
│     ├── Claude CLI via mitmproxy → expect 200                   │
│     ├── OpenCode + patched plugin → expect 200                  │
│     └── on fail → feed error back to agent, regenerate          │
└──────────────────────────┬──────────────────────────────────────┘
                           ▼ (tests pass)
┌─────────────────────────────────────────────────────────────────┐
│  4. RELEASE                                                     │
│     git commit → version bump → push                            │
└─────────────────────────────────────────────────────────────────┘

Algorithm

1. CAPTURE

• Run Claude CLI through mitmproxy
• Extract request signature: URL, query params, headers (user-agent, anthropic-beta, authorization)
• Save to current_signature.json
• Compare against baseline_signature.json
• If no diff → exit
• If diff → update baseline, proceed to step 2

2. GENERATE

• Load: diff, current plugin.mjs, prompt template
• Call OpenCode agent with context
• Agent outputs patched plugin.mjs
• Parse output, validate JS syntax via AST

3. TEST

• Set attempt = 0

• Loop while attempt < 3:

  • Run OpenCode with patched plugin against Anthropic API
  • If response 200 → break, go to step 4
  • If error → capture error message, feed back to agent, regenerate patch, attempt++

• If all attempts fail → alert, exit with failure

4. RELEASE

• git add plugin.mjs
• npm version patch
• git commit -m "auto-fix: oauth signature update"
• git push origin main

Cool idea but mitmproxy needs CA cert install which is a security concern for automation.

Tried checking Claude Code npm package but it's heavily minified/obfuscated (11MB single file, variable names like oq9, iq9...). They even have a comment: "Want to see the unminified source? We're hiring!" lol

Maybe a sandboxed VM just for capture? Or wait for signature changes to surface in the wild first, then react.