OpenCode shows devsense is reporting false positive syntax errors

ColinMollenhour

OpenCode uses devsense as the LSP for PHP. When editing PHP files I often see that the LSP reported an error, but then the LLM recognizes it as a false positive and moves on.

E.g. if the file has 95 lines, it will say:

Error [96:1] Syntax error: unexpected token '<'

Also reported here, I'm not 100% sure if this problem is with Devsense or OpenCode: https://github.com/anomalyco/opencode/issues/11672

JakubMisek

ColinMollenhour, thank you for reporting the issue.

We'd need more context from that file, at least the whole line. Otheriwse we can't reproduce the issue.

ColinMollenhour

JakubMisek It seems to happen to just about any PHP file, the line number reported is always one greater than the actual number of lines in that file.
Another example:

ColinMollenhour

Here is a minimal reproduction. :)

JakubMisek

Thank you,

It looks like devsense-php is not installed by default (and we don't even know where it comes from :) )

Have you installed/configured anything in addition to the standard OpenCode installation?

ColinMollenhour

JakubMisek

Oops, looks like I set this up months ago in my ~/.config/opencode/opencode.json:

  "lsp": {
    "devsense-php": {
      "command": ["/home/colin/.local/share/pnpm/devsense-php-ls", "--stdio"],
      "extensions": [".php", ".phtml"],
      "initialization": {
        "0": "{\"name\":\"...\",\"email\":\"...\",\"expiration\":\"Tue, 11 Nov 2025 21:24:25 GMT\",\"signature\":\"...\"}",
        "php.version": "8.2"
      },
      "env": {
        "DEVSENSE_PHP_LS_LICENSE": "{\"name\":\"....\"}"
      }
    }
  },

ColinMollenhour

I updated devsense-php-ls to 1.0.18434 and confirmed the same error still. Also tried a different model.

JakubMisek

I've
Installed OpenCode on Windows,
Connected GitHub Copilot,
Added "devsense-php" lsp, and disabled the other PHP lsp.

I have a bit of a different UI, but can't reproduce the issue:

The error you have Error [96:1] Syntax error: unexpected token '<' indicates that the OpenCode is adding something to the end of the file, or maybe just sending unexpected text edits to the lsp - but so far I can't reproduce it.

Is there some log in OpenCode that would show the communication between OpenCode and lsp?

ColinMollenhour

JakubMisek Thanks for looking into this. I don't see the error when the file is initially created, just when it's modified. I tried it in the web UI which is similar to the desktop UI and didn't see the error the first few tries using Kimi K2.5 but did see them using Sonnet 4.5 which is odd, I thought I had done it with K2.5 already.. But it's also not 100% consistent, seems like maybe 90% of the time. Here is the session I just used: https://opncd.ai/share/P1SCFude (click through the messages on the left sidebar)
Note, I've never witnessed the file actually having any additional characters in it. I don't know how LSPs work, does the LSP only read the file from disk or can the client also send the file contents to the LSP?

JakubMisek

ColinMollenhour language server (devsense-php) is getting messages from OpenCode like

textdocument/didOpen
textdocument/didChange with modifications
etc.

So we rely on what is being told in those messages. But maybe we interpret it wrong.

That's why a log would be helpful.

I've been told that the following command should export the log:

opencode --print-logs --log-level DEBUG debug lsp diagnostics [file_name]

ColinMollenhour

JakubMisek Ahh, that's good to see, but unfortunately it doesn't show anything interesting:

INFO  2026-02-03T17:12:22 +0ms service=lsp LSP server php intelephense is disabled
INFO  2026-02-03T17:12:22 +0ms service=lsp serverIds=deno, typescript, vue, eslint, oxlint, biome, gopls, ruby-lsp, pyright, elixir-ls, zls, csharp, fsharp, sourcekit-lsp, rust, clangd, svelte, astro, jdtls, kotlin-ls, yaml-ls, lua-ls, prisma, dart, ocaml-lsp, bash, terraform, texlab, dockerfile, gleam, clojure-lsp, nixd, tinymist, haskell-language-server, devsense-php enabled LSP servers
INFO  2026-02-03T17:12:22 +0ms service=file.watcher init
INFO  2026-02-03T17:12:22 +2ms service=scheduler id=snapshot.cleanup run
INFO  2026-02-03T17:12:22 +0ms service=scheduler id=tool.truncation.cleanup run
INFO  2026-02-03T17:12:22 +0ms service=bus type=command.executed subscribing
INFO  2026-02-03T17:12:22 +1ms service=file.watcher platform=linux backend=inotify watcher backend
INFO  2026-02-03T17:12:22 +1ms service=lsp file=js/hello.php touching file
INFO  2026-02-03T17:12:22 +3ms service=lsp serverID=devsense-php spawned lsp server
INFO  2026-02-03T17:12:22 +0ms service=lsp.client serverID=devsense-php starting client
INFO  2026-02-03T17:12:22 +2ms service=lsp.client serverID=devsense-php sending initialize
INFO  2026-02-03T17:12:22 +3ms service=vcs branch=ghsa-fixes initialized
INFO  2026-02-03T17:12:22 +0ms service=bus type=file.watcher.updated subscribing
INFO  2026-02-03T17:12:22 +146ms service=snapshot prune=7.days cleanup
INFO  2026-02-03T17:12:23 +688ms service=lsp.client serverID=devsense-php initialized
INFO  2026-02-03T17:12:23 +1ms service=bus type=lsp.updated publishing
INFO  2026-02-03T17:12:23 +0ms service=lsp.client serverID=devsense-php path=/home/colin/projects/openmage/magento-lts/js/hello.php waiting for diagnostics
INFO  2026-02-03T17:12:23 +0ms service=bus type=lsp.client.diagnostics subscribing
INFO  2026-02-03T17:12:23 +1ms service=lsp.client serverID=devsense-php path=/home/colin/projects/openmage/magento-lts/js/hello.php workspace/didChangeWatchedFiles
INFO  2026-02-03T17:12:23 +0ms service=lsp.client serverID=devsense-php path=/home/colin/projects/openmage/magento-lts/js/hello.php textDocument/didOpen
INFO  2026-02-03T17:12:26 +3000ms service=bus type=lsp.client.diagnostics unsubscribing

But I can reproduce the error without a GUI using this:

mkdir test
cd test
echo -e "<?php\n\necho \"hello world\";\n" > hello.php
opencode --print-logs --log-level DEBUG run "change hello.php to say \"hello ASDF\"." --model anthropic/claude-sonnet-4-5 2>&1 | tee hello.log

I tried disabling devsense and enabling intelephense to see if I could reproduce it with that, but for some reason it times out starting (45s) even on a completely clean directory.. Not sure if that is specific to my environment but I guess that's one reason I switched to devsense.. :D

Is there a way I can capture debug output from devsense?

JakubMisek

ColinMollenhour thank you for the details.

I'll add some additional logging, and will get back to you!

JakubMisek

ColinMollenhour please try the (upcoming) update 1.0.18459 with additional argument "--lsp-log":

"command": [
  "devsense-php-ls",
  "--stdio",
  "--lsp-log", "full-path-to-new-log-file.json"
],

The log file "full-path-to-new-log-file.json" will contain the communication between OpenCode and our language server, and hopefully we will see what's happening.

ColinMollenhour

JakubMisek I assume I need to wait for this version to be released? On that note, is there a way to be notified of new releases and to see release notes for the LSP?

JakubMisek

ColinMollenhour since it is a standalone npm package, you can watch it here: https://www.npmjs.com/package/devsense-php-ls/v/1.0.18459

ColinMollenhour

I installed the latest version and captured the logs:

{"jsonrpc":"2.0","id":0,"method":"initialize","params":{"rootUri":"file:///home/colin/projects/test","processId":18087,"workspaceFolders":[{"name":"workspace","uri":"file:///home/colin/projects/test"}],"initializationOptions":{"0":"{\"name\":\"******REDACTED*********\"}","php.version":"8.2"},"capabilities":{"window":{"workDoneProgress":true},"workspace":{"configuration":true,"didChangeWatchedFiles":{"dynamicRegistration":true}},"textDocument":{"synchronization":{"didOpen":true,"didChange":true},"publishDiagnostics":{"versionSupport":true}}}}}
{"jsonrpc":"2.0","method":"window/logMessage","params":{"type":3,"message":"Language Server Started (Build 02/04/2026)"}}
{"jsonrpc":"2.0","method":"window/logMessage","params":{"type":3,"message":"License registered to Colin Mollenhour \u003Ccm525i@gmail.com\u003E."}}
{"jsonrpc":"2.0","method":"window/logMessage","params":{"type":3,"message":"PID: 18101"}}
{"jsonrpc":"2.0","method":"window/logMessage","params":{"type":3,"message":"Indexing \u0027file:///home/colin/projects/test\u0027 ..."}}
{"jsonrpc":"2.0","id":0,"result":{"capabilities":{"selfProfiler":false,"textDocumentSync":{"openClose":true,"change":2},"hoverProvider":true,"completionProvider":{"triggerCharacters":["\u003E",":","$","\\","@"," ","\u0027","/","[","\u003C"],"completionItem":{"labelDetailsSupport":true},"resolveProvider":true},"implementationProvider":true,"referencesProvider":true,"definitionProvider":true,"typeDefinitionProvider":true,"documentSymbolProvider":true,"workspaceSymbolProvider":true,"codeActionProvider":{"codeActionKinds":["","source","source.organizeImports","source.sortImports","source.sortAndRemoveImports","quickfix","refactor"],"resolveProvider":false},"codeLensProvider":{"resolveProvider":true},"renameProvider":{"prepareProvider":true},"documentHighlightProvider":true,"documentFormattingProvider":false,"documentRangeFormattingProvider":true,"documentOnTypeFormattingProvider":{"firstTriggerCharacter":";","moreTriggerCharacter":["}",":"]},"signatureHelpProvider":{"triggerCharacters":["(",","]},"selectionRangeProvider":true,"inlayHintProvider":{"resolveProvider":true},"linkedEditingRangeProvider":true,"semanticTokensProvider":{"legend":{"tokenTypes":["namespace","type","class","enum","interface","struct","typeParameter","parameter","variable","property","enumMember","event","function","method","macro","keyword","modifier","comment","string","number","regexp","operator","decorator"],"tokenModifiers":["declaration","definition","readonly","static","deprecated","abstract","async","modification","documentation","defaultLibrary"]},"range":true,"full":true},"foldingRangeProvider":true,"executeCommandProvider":{"commands":["devsense:implementabstracts","devsense:implementgettersetter","devsense:implementctor","devsense:organizeUses","devsense:peekReferences","devsense:peekImplementations","devsense:peekTraitUses","devsense:peekBaseImplementation","devsense:adddocblock","devsense:formatCode","devsense:executeBladeSwitchViewClass","devsense:extractfn","devsense:showMessage"]},"workspace":{"workspaceFolders":{"supported":true,"changeNotifications":true}}}}}
{"jsonrpc":"2.0","method":"initialized","params":{}}
{"jsonrpc":"2.0","id":4097,"method":"client/registerCapability","params":{"registrations":[{"id":"file-watcher-1","method":"workspace/didChangeWatchedFiles","registerOptions":{"watchers":[{"globPattern":"**","kind":7}]}}]}}
{"jsonrpc":"2.0","id":4098,"method":"client/registerCapability","params":{"registrations":[{"id":"config-watcher-1","method":"workspace/didChangeConfiguration"}]}}
{"jsonrpc":"2.0","method":"workspace/didChangeConfiguration","params":{"settings":{"0":"{\"name\":\"******REDACTED*********\"}","php.version":"8.2"}}}
{"jsonrpc":"2.0","method":"workspace/didChangeWatchedFiles","params":{"changes":[{"uri":"file:///home/colin/projects/test/hello.php","type":1}]}}
{"jsonrpc":"2.0","method":"textDocument/didOpen","params":{"textDocument":{"uri":"file:///home/colin/projects/test/hello.php","languageId":"php","version":0,"text":"<?php\n\necho \"hello ASDF\";\n\n"}}}
{"jsonrpc":"2.0","id":4097,"result":null}
{"jsonrpc":"2.0","id":4098,"result":null}
{"jsonrpc":"2.0","id":4099,"method":"workspace/codeLens/refresh","params":null}
{"jsonrpc":"2.0","id":4099,"error":{"code":-32601,"message":"Unhandled method workspace/codeLens/refresh"}}
{"jsonrpc":"2.0","id":4100,"method":"workspace/inlayHint/refresh","params":null}
{"jsonrpc":"2.0","id":4100,"error":{"code":-32601,"message":"Unhandled method workspace/inlayHint/refresh"}}
{"jsonrpc":"2.0","method":"workspace/didChangeWatchedFiles","params":{"changes":[{"uri":"file:///home/colin/projects/test/hello.php","type":2}]}}
{"jsonrpc":"2.0","method":"textDocument/didChange","params":{"textDocument":{"uri":"file:///home/colin/projects/test/hello.php","version":1},"contentChanges":[{"text":"<?php\n\necho \"hello dude\";\n\n"}]}}
{"jsonrpc":"2.0","method":"textDocument/publishDiagnostics","params":{"uri":"file:///home/colin/projects/test/hello.php","diagnostics":[{"range":{"start":{"line":4,"character":0},"end":{"line":4,"character":1}},"code":"PHP2014","source":"PHP","message":"Syntax error: unexpected token \u0027\u003C\u0027","severity":1}]}}
{"jsonrpc":"2.0","method":"textDocument/publishDiagnostics","params":{"uri":"file:///home/colin/projects/test/hello.php","diagnostics":[{"range":{"start":{"line":4,"character":0},"end":{"line":4,"character":1}},"code":"PHP2014","source":"PHP","message":"Syntax error: unexpected token \u0027\u003C\u0027","severity":1}]}}

JakubMisek

ColinMollenhour, awesome! Thank you very much, and thanks for redacting the text as well - I didn't realize it may contain sensitive info.

I see the problem, ~~OpenCode does not send some properties (namely TextDocumentContentChangeEvent#range)~~ we don't respect the complete specification :)

This will be easy to fix on our side.

Edit: Please try devsense-php-ls 1.0.18465

ColinMollenhour

JakubMisek
Looks like the latest version fixed it! Thanks Jakub, you're the man!

JakubMisek

ColinMollenhour awesome! thank you very much for your help with this issue