anomalyco/opencode
1
0
Fork 0
mirror of https://github.com/anomalyco/opencode.git synced 2026-07-23 18:55:37 -04:00
Code Issues 5.9k Packages Projects Releases 19 Wiki Activity

[BUG] tools[21].function.name': string too long. Expected a string with maximum length 64, but got a string with length 65 instead. #2323

New Issue
Open
opened 2026-02-16 17:35:07 -05:00 by yindo · 8 comments
yindo commented 2026-02-16 17:35:07 -05:00
Owner
Copy Link
Copy Source

Originally created by @Racle on GitHub (Oct 29, 2025).

Description

Tool name is too long. This was taken from logs.
Opencode does not send any error message to TUI, it just will die silently.
And it also do not process any more request when tool name is too long, even when unrelated to MCP servers.

Might be related to this: https://github.com/sst/opencode/blob/a0541ba57aebcdb21c36540f0efd8a251fdbc2b8/packages/opencode/src/mcp/index.ts#L207-L209

This generates tool name from mcp name + tool name.
It would be better to set that max size to 64 characters to fix this issue.

Same issue was in https://github.com/ravitemer/mcphub.nvim/pull/243 and limiting tool length fixed it. In difference, mcphub.nvim throws an error to user.

OpenCode version

0.15.23

Steps to reproduce

  1. Change MCP server to long name (60+ characters)
  2. Try to use opencode with any MCP server
  3. Opencode will just die silently after running "generating" for second

Screenshot and/or share link

Image

Operating System

Pop_os 22.04.

Terminal

Kitty, tmux, nvim with sidekick.nvim

Originally created by @Racle on GitHub (Oct 29, 2025). ### Description Tool name is too long. This was taken from logs. Opencode does not send any error message to TUI, it just will die silently. And it also do not process any more request when tool name is too long, even when unrelated to MCP servers. Might be related to this: https://github.com/sst/opencode/blob/a0541ba57aebcdb21c36540f0efd8a251fdbc2b8/packages/opencode/src/mcp/index.ts#L207-L209 This generates tool name from `mcp name` + `tool name`. It would be better to set that max size to 64 characters to fix this issue. Same issue was in https://github.com/ravitemer/mcphub.nvim/pull/243 and limiting tool length fixed it. In difference, mcphub.nvim throws an error to user. ### OpenCode version 0.15.23 ### Steps to reproduce 1. Change MCP server to long name (60+ characters) 2. Try to use opencode with _any_ MCP server 3. Opencode will just die silently after running "generating" for second ### Screenshot and/or share link <img width="432" height="233" alt="Image" src="https://github.com/user-attachments/assets/c2fdbe7b-db37-4598-88b8-57fc50bc6f3b" /> ### Operating System Pop_os 22.04. ### Terminal Kitty, tmux, nvim with sidekick.nvim
yindo added the bug label 2026-02-16 17:35:07 -05:00
yindo commented 2026-02-16 17:35:07 -05:00
Author
Owner
Copy Link
Copy Source

@github-actions[bot] commented on GitHub (Oct 29, 2025):

This issue might be a duplicate of existing issues. Please check:

  • #3245: Similar MCP tool naming issue with string pattern validation - Slack MCP server fails with 'String should match pattern' error for tool names
  • #3354: MCP tools failing with 'String should match pattern' error when using Anthropic Sonnet 4.5 and MCP servers

Both issues involve MCP server tool naming validation problems, though #3523 specifically mentions the 64-character length limit while the others mention pattern validation. The root cause appears related to how OpenCode generates tool names from MCP server names + tool names.

Feel free to ignore if none of these address your specific case.

@github-actions[bot] commented on GitHub (Oct 29, 2025): This issue might be a duplicate of existing issues. Please check: - #3245: Similar MCP tool naming issue with string pattern validation - Slack MCP server fails with 'String should match pattern' error for tool names - #3354: MCP tools failing with 'String should match pattern' error when using Anthropic Sonnet 4.5 and MCP servers Both issues involve MCP server tool naming validation problems, though #3523 specifically mentions the 64-character length limit while the others mention pattern validation. The root cause appears related to how OpenCode generates tool names from MCP server names + tool names. Feel free to ignore if none of these address your specific case.
yindo commented 2026-02-16 17:35:07 -05:00
Author
Owner
Copy Link
Copy Source

@rekram1-node commented on GitHub (Oct 29, 2025):

What provider gave that error?

@rekram1-node commented on GitHub (Oct 29, 2025): What provider gave that error?
yindo commented 2026-02-16 17:35:07 -05:00
Author
Owner
Copy Link
Copy Source

@Racle commented on GitHub (Oct 29, 2025):

What provider gave that error?

Company internal MCP server. Tool names are generated and limited to ~50 characters.

@Racle commented on GitHub (Oct 29, 2025): > What provider gave that error? Company internal MCP server. Tool names are generated and limited to ~50 characters.
yindo commented 2026-02-16 17:35:07 -05:00
Author
Owner
Copy Link
Copy Source

@rekram1-node commented on GitHub (Oct 29, 2025):

@Racle but that error comes from an inference provider I thought, I don't think the ai sdk is throwing it (could be wrong tho)

What inference provider was it? Openai? Google?

@rekram1-node commented on GitHub (Oct 29, 2025): @Racle but that error comes from an inference provider I thought, I don't think the ai sdk is throwing it (could be wrong tho) What inference provider was it? Openai? Google?
yindo commented 2026-02-16 17:35:07 -05:00
Author
Owner
Copy Link
Copy Source

@Racle commented on GitHub (Oct 29, 2025):

@Racle but that error comes from an inference provider I thought, I don't think the ai sdk is throwing it (could be wrong tho)

What inference provider was it? Openai? Google?

Test MCP config what can be used to test this:

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "chrome-devtools-aaaaaaaaaaaaaaaaaaaaa": {
      "type": "local",
      "command": ["npx", "chrome-devtools-mcp@latest"]
    }
  }
}

I'm using GitHub Copilot GPT-4.1 as that is the only one I currently have access.

I see the error in opencode log files (running this as opencode --log-level DEBUG ), but terminal client just dies silently. There is no error message.

INFO  2025-10-29T16:10:59 +1ms service=session.prompt session=ses_5cf4368afffewe4wL4auBcU6OA type=error part
ERROR 2025-10-29T16:10:59 +1ms service=session.prompt session=ses_5cf4368afffewe4wL4auBcU6OA error=Invalid 'tools[29].function.name': string too long. Expected a string with maximum length 64, but got a string with length 65 instead. process
@Racle commented on GitHub (Oct 29, 2025): > [@Racle](https://github.com/Racle) but that error comes from an inference provider I thought, I don't think the ai sdk is throwing it (could be wrong tho) > > What inference provider was it? Openai? Google? Test MCP config what can be used to test this: ``` { "$schema": "https://opencode.ai/config.json", "mcp": { "chrome-devtools-aaaaaaaaaaaaaaaaaaaaa": { "type": "local", "command": ["npx", "chrome-devtools-mcp@latest"] } } } ``` I'm using `GitHub Copilot GPT-4.1` as that is the only one I currently have access. I see the error in opencode log files (running this as `opencode --log-level DEBUG `), but terminal client just dies silently. There is no error message. ``` INFO 2025-10-29T16:10:59 +1ms service=session.prompt session=ses_5cf4368afffewe4wL4auBcU6OA type=error part ERROR 2025-10-29T16:10:59 +1ms service=session.prompt session=ses_5cf4368afffewe4wL4auBcU6OA error=Invalid 'tools[29].function.name': string too long. Expected a string with maximum length 64, but got a string with length 65 instead. process ```
yindo commented 2026-02-16 17:35:07 -05:00
Author
Owner
Copy Link
Copy Source

@rekram1-node commented on GitHub (Oct 29, 2025):

good to know thanks!

@rekram1-node commented on GitHub (Oct 29, 2025): good to know thanks!
yindo commented 2026-02-16 17:35:07 -05:00
Author
Owner
Copy Link
Copy Source

@faizhasim commented on GitHub (Nov 13, 2025):

I encounter similar issues when using any of the gpt models (from copilot) and docker mcp enabled. Other models (claude/gemini 2.5 pro) works fine.

Image
@faizhasim commented on GitHub (Nov 13, 2025): I encounter similar issues when using any of the gpt models (from copilot) and docker mcp enabled. Other models (claude/gemini 2.5 pro) works fine. <img width="1047" height="78" alt="Image" src="https://github.com/user-attachments/assets/31dc9e6a-8247-4a7f-9757-0749a3b8b624" />
yindo commented 2026-02-16 17:35:08 -05:00
Author
Owner
Copy Link
Copy Source

@rekram1-node commented on GitHub (Nov 13, 2025):

Yeah if you are using too many tools they get upset, im not sure what we can do for u besides truncate the tools and give u an error or warning

@rekram1-node commented on GitHub (Nov 13, 2025): Yeah if you are using too many tools they get upset, im not sure what we can do for u besides truncate the tools and give u an error or warning
Sign in to join this conversation.
No Branch/Tag Specified
Branches Tags
Labels
Clear labels
acp
bad
bug
discussion
docs
documentation
enhancement
extension
good first issue
growth
help-wanted
mcp
model-problem
needs:compliance
nix
opentui
perf
pull-request
Mirrored from GitHub Pull Request
 tui
web
windows
zen
No Label bug
Milestone
No items
No Milestone
Projects
Clear projects
No project
Assignees
Clear assignees
yindo
No Assignees
1 Participants
Notifications
Due Date
No due date set.
Dependencies

No dependencies set.

Reference: anomalyco/opencode#2323
Delete Branch "%!s()"

Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?