fix: claude oauth by renaming tools on in/out

[ashh-online]

Summary

• Prefixes tool names with oc_ in outgoing requests
• Strips the oc_ prefix from tool names in streaming responses

Test plan

Tested with opencode run -m anthropic/claude-sonnet-4-5 and verified tool calls work correctly.

[devxoul]

I can confirm this works

[junhoyeo]

if it works i think we can propose a more general solution like obfuscating tool names on each request/session etc

[devxoul]

Here's how to run this patch locally:

(since anomalyco/opencode#5957 isn't merged yet, we cannot override built-in plugins so we need to built both opencode and the anthropic plugin to test)

Updated (After 0.0.7 got released)

Just add opencode-anthropic-auth@0.0.7 to the plugins field in you opencode.json.

(@0.0.7 isn't required actually but I prefer specifying them because OpenCode will always check for the latest version via npm which slows down the startup when version is not specified)

Archived

1. Plugin: Clone and Checkout the PR Branch

git clone https://github.com/anomalyco/opencode-anthropic-auth.git  # if not already cloned
cd opencode-anthropic-auth
gh pr checkout 10  # or: git fetch origin fix/claude-oauth-tools && git checkout fix/claude-oauth-tools
bun install

2. OpenCode: Modify opencode to Use Local Plugin

In packages/opencode/src/plugin/index.ts, change the BUILTIN array:

- const BUILTIN = ["opencode-copilot-auth@0.0.9", "opencode-anthropic-auth@0.0.5"]
+ const BUILTIN = ["opencode-copilot-auth@0.0.9", "file:///path/to/opencode-anthropic-auth/index.mjs"]

3. Run opencode

cd /path/to/opencode
bun install
bun dev

4. To Run Globally

cd packages/opencode && bun run build -- --single
export PATH=$PWD/dist/opencode-darwin-arm64/bin/:$PATH

[KimDaehyeon6873]

So, after this, there will be no issue about "This credential is only authorized for use with Claude Code and cannot be used for other API requests."?

[jksjaz]

Claude bypass written by claude 🤣

[tariqkb]

FWIW, renaming the tools to match claude code's tools exactly also fixes it. i.e. use PascalCase for tool names

[rdvo]

what are the actual tool names in CC? I feel matching them would be better than a prefix that cna easily blcok again

[zainsyedz]

FWIW, renaming the tools to match claude code's tools exactly also fixes it. i.e. use PascalCase for tool names

So they're creating a signature at their end to verify the client?

[airtonix]

what are the actual tool names in CC? I feel matching them would be better than a prefix that cna easily blcok again

anomalyco/opencode#7410 (comment)

It's mostly: {name}_tool

[zkdiff]

Legendary!

[qlido]

캬

[lastbattle]

wow thats fast

[Sewer56]

This would still be easy to catch server side.
Should we not just rename the tools to capitalize the first letter?
That way, they would match CC's.

@rekram1-node

[Well, that only works till the lawyers get involved, but still]

[JimiHFord]

Issues with Claude Opus and Oh My Opencode sent me here. Now that it's merged, anyone know how we can test it out with oh my opencode? Pretty new to how all this stuff is connected tbh

[ChaseRensberger]

if this was the best they could come up with to stop third party users then i think we are safe for a while

[gtg7784]

Here's how to run this patch locally:

(since anomalyco/opencode#5957 isn't merged yet, we cannot override built-in plugins so we need to built both opencode and the anthropic plugin to test)

1. Plugin: Clone and Checkout the PR Branch

git clone https://github.com/anomalyco/opencode-anthropic-auth.git  # if not already cloned
cd opencode-anthropic-auth
gh pr checkout 10  # or: git fetch origin fix/claude-oauth-tools && git checkout fix/claude-oauth-tools
bun install

2. OpenCode: Modify opencode to Use Local Plugin

In packages/opencode/src/plugin/index.ts, change the BUILTIN array:

- const BUILTIN = ["opencode-copilot-auth@0.0.9", "opencode-anthropic-auth@0.0.5"]
+ const BUILTIN = ["opencode-copilot-auth@0.0.9", "file:///path/to/opencode-anthropic-auth/index.mjs"]

3. Run opencode

cd /path/to/opencode
bun install
bun dev

4. To Run Globally

cd packages/opencode && bun run build -- --single
export PATH=$PWD/dist/opencode-darwin-arm64/bin/:$PATH

@devxoul you saved my life, thanks

[harshav167]

Re: #10 (comment) — you can override the plugin via config now (no core source edits needed):\n\n\n\nThis loads the local plugin without modifying opencode source.

[dominicnieto]

Re: #10 (comment) — you can override the plugin via config now (no core source edits needed):\n\n\n\nThis loads the local plugin without modifying opencode source.

how do i do this?

[adiman9]

Re: #10 (comment) — you can override the plugin via config now (no core source edits needed):\n\n\n\nThis loads the local plugin without modifying opencode source.

how do i do this?

Just add "opencode-anthropic-auth" into the plugin array in opencode.json

[devxoul]

Re: #10 (comment) — you can override the plugin via config now (no core source edits needed):\n\n\n\nThis loads the local plugin without modifying opencode source.

how do i do this?

Just add "opencode-anthropic-auth" into the plugin array in opencode.json

Oh yeah, 0.0.7 has released recently so that would work now. Now I can update the workaround. 👉 updated

[MickBuilder]

Here's how to run this patch locally:

(since anomalyco/opencode#5957 isn't merged yet, we cannot override built-in plugins so we need to built both opencode and the anthropic plugin to test)

Updated (After 0.0.7 got released)

Just add opencode-anthropic-auth@0.0.7 to the plugins field in you opencode.json.

(@0.0.7 isn't required actually but I prefer specifying them because OpenCode will always check for the latest version via npm which slows down the startup when version is not specified)

Archived

1. Plugin: Clone and Checkout the PR Branch

git clone https://github.com/anomalyco/opencode-anthropic-auth.git  # if not already cloned
cd opencode-anthropic-auth
gh pr checkout 10  # or: git fetch origin fix/claude-oauth-tools && git checkout fix/claude-oauth-tools
bun install

2. OpenCode: Modify opencode to Use Local Plugin

In packages/opencode/src/plugin/index.ts, change the BUILTIN array:

- const BUILTIN = ["opencode-copilot-auth@0.0.9", "opencode-anthropic-auth@0.0.5"]
+ const BUILTIN = ["opencode-copilot-auth@0.0.9", "file:///path/to/opencode-anthropic-auth/index.mjs"]

3. Run opencode

cd /path/to/opencode
bun install
bun dev

4. To Run Globally

cd packages/opencode && bun run build -- --single
export PATH=$PWD/dist/opencode-darwin-arm64/bin/:$PATH

I'm not finding "opencode.json" but "package.json"

[stevechoi0222]

please update in here if someone gets banned using this method

[devxoul]

I'm not finding "opencode.json" but "package.json"

@MickBuilder Check your config file locations.

[JulianMason]

does this actually work? I implemented it and oauth works, however, i can only use Sonnet. Even though I see full list of Anthropic models I can use, no matter which I select (like Opus 4.5), when I asked the model which model it is, it says Sonnet. I ask the same question on Claude Code after selecting Opus 4.5 and the output is Opus 4.5. Anyone else experiencing this?

[hiddentn]

Is anyone else experiencing this again? (2:30 PM Friday, Jan 9, 2026 UTC)

[fivetaku]

It worked great for me at first, but my Claude Code OAuth access seems to be blocked again now.

[aciceri]

It worked great for me at first, but my Claude Code OAuth access seems to be blocked again now.

Same here

[HaD0Yun]

Some guy solve that problem do this

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

[guisaliba]

does it still work?