add experimental.open_telemetry config option to enable OTEL spans #4978

noamzbr · 2025-12-02T10:56:38Z

Related Issues

Feature Request: Add Langfuse Tracing #219
[Question] detailed per-interaction telemetry (token counts and input composition) for opencode-model communications #2666

What this does

AI SDK has an experimental_telemetry flag. When enabled, it will automatically emit OTEL spans. I've added an optional config that turns that on in all calls to AI SDK generation functions.
The user can then use any OTEL supporting framework for tracing. For example, in Langfuse it's pretty simple - the user can build a simple plugin to send the generated spans to Langfuse.

Happy to add / edit / expand if needed!

- AI SDK emits Open Telemetry Spans when experimental_telemetry is true - Define an open_telemetry config field to control this flag (false by default)

r-costa-tornis · 2025-12-03T17:37:42Z

👀

r-costa-tornis · 2025-12-03T17:39:43Z

Can you provide a little doc explaining how to enable langfuse for example?
In the config files I mean.

noamzbr · 2025-12-03T20:43:23Z

Sure, you should add "open_telemetry": true in your opencode.jsonc, and then add a relevant plugin. For Langfuse, the following plugin worked for me

/**
 * Langfuse OpenTelemetry Plugin for OpenCode
 * 
 * Requires: bun add @langfuse/otel @opentelemetry/sdk-node
 * Env vars: LANGFUSE_PUBLIC_KEY, LANGFUSE_SECRET_KEY, LANGFUSE_HOST
 */
import { NodeSDK } from "@opentelemetry/sdk-node"
import { LangfuseSpanProcessor } from "@langfuse/otel"

let initialized = false

export const LangfusePlugin = async () => ({
  async config(config) {
    if (!config.open_telemetry || initialized) return
    initialized = true

    const processor = new LangfuseSpanProcessor()
    new NodeSDK({ spanProcessors: [processor] }).start()

    // // Flush frequently - Required in headless mode to make sure flushes are made before process exit
    // setInterval(() => processor.forceFlush(), 500)
  },
})

r-costa-tornis · 2025-12-05T16:32:28Z

@rekram1-node 👀

rekram1-node · 2025-12-05T16:33:26Z

I'm a bit behind on prs at the moment but lemme take a look

rekram1-node · 2025-12-05T16:36:32Z

/oc rename open_telemetry to be under "experimental" object in the config, update all locations it's used

opencode-agent · 2025-12-05T16:37:15Z

Perfect! All changes are in place. Let me create a summary of what was changed:

Summary

I've successfully renamed open_telemetry to be under the experimental object in the config. Here are the changes made:

Changes Made:

Config Schema (packages/opencode/src/config/config.ts):
- Removed open_telemetry from the root config object
- Added openTelemetry to the experimental object (line 673-676)
Agent (packages/opencode/src/agent/agent.ts):
- Updated line 233: cfg.open_telemetry → cfg.experimental?.openTelemetry
Session Compaction (packages/opencode/src/session/compaction.ts):
- Updated line 196: cfg.open_telemetry → cfg.experimental?.openTelemetry
Session Prompt (packages/opencode/src/session/prompt.ts):
- Updated line 618: cfg.open_telemetry → cfg.experimental?.openTelemetry
- Updated line 1470: cfg.open_telemetry → cfg.experimental?.openTelemetry
Session Summary (packages/opencode/src/session/summary.ts):
- Updated line 114: cfg.open_telemetry → cfg.experimental?.openTelemetry
- Updated line 156: cfg.open_telemetry → cfg.experimental?.openTelemetry

New Config Format:

Users should now use the following format in their opencode.jsonc:

{
  "experimental": {
    "openTelemetry": true
  }
}

Instead of the previous format:

{
  "open_telemetry": true
}

opencode session | github run

Co-authored-by: rekram1-node <rekram1-node@users.noreply.github.com>

r-costa-tornis · 2025-12-05T16:44:55Z

🎉 🎉 🎉 🎉
Ty so much @rekram1-node

* fix: ensure checkUpgrade sets `init:` (anomalyco#5040) * chore: format code * ci: use blacksmith runners in review workflow too (anomalyco#5042) * zen: make session provider sticky * ci: only maintainer can trigger * ci: cleaner * ignore: update download stats 2025-12-04 * fix(tui): cursor color * Preserve prompt input when creating new session (anomalyco#4993) * fix: model not being passed correctly to tool * tweak: bash tool messages regarding timeouts and truncation more clear for agent (anomalyco#5066) * tui: fix /new slash command being persisted in prompt input * add optional prompt Input to Github Action (anomalyco#4828) Co-authored-by: Github Action <action@github.com> Co-authored-by: Aiden Cline <63023139+rekram1-node@users.noreply.github.com> Co-authored-by: opencode-agent[bot] <opencode-agent[bot]@users.noreply.github.com> * bump: builtin plugin versions * feat: Add SAP AI Core provider support (anomalyco#5023) Signed-off-by: Jérôme Benoit <jerome.benoit@piment-noir.org> * core: ensure model npm package falls back to dev models config when not explicitly defined * docs: add CodeCompanion.nvim integration instructions (anomalyco#5079) * tweak: bash tool description re commit stuff * core: add test for custom model npm package inheritance * feat(desktop): terminal pane (anomalyco#5081) Co-authored-by: Github Action <action@github.com> Co-authored-by: Dax Raad <d@ironbay.co> * Revert "feat(desktop): terminal pane (anomalyco#5081)" This reverts commit d763c11. * release: v1.0.133 * Update Nix flake.lock and hashes * Reapply "feat(desktop): terminal pane (anomalyco#5081)" This reverts commit f9dcd97. * chore: format code * Update Nix flake.lock and hashes * zen: fix byok * ignore: fix provider credentials query for BYOK Provider credentials field was being selected from ProviderTable even when the table wasn't joined (when byokProvider was undefined). Now the join is conditional - when byokProvider exists, we join and get the credentials; when it doesn't, the join condition is always false so provider remains null. * docs: llama.cpp docs: `limit` moved under model (anomalyco#5089) Co-authored-by: opencode-agent[bot] <opencode-agent[bot]@users.noreply.github.com> Co-authored-by: GitHub Action <action@github.com> * fix: add getModel to SAP AI Core provider for correct SDK initialization (anomalyco#5086) Signed-off-by: Jérôme Benoit <jerome.benoit@piment-noir.org> * fix pty builds * fix * increase default scroll speed * ci: review * fix: ensure that vcs is still set to git even if no commits in repo * ignore: rm slop commnand (only for opencode repo this isnt shipping) * chore: format code * ignore: cmd tweak * tui: wrap dialog option descriptions (anomalyco#5083) * ci: keybinds * fix: ensure projects that go from having no commits to having commits have sessions migrated (anomalyco#5105) Co-authored-by: GitHub Action <action@github.com> * ignore: tweak * ignore: update download stats 2025-12-05 * Zen: add codex max * do not use required pty for local dev * fix: anomalyco#5064 ProviderInitError github-copilot-enterprise (anomalyco#5123) * feat(theme): Vercel (anomalyco#5119) Co-authored-by: opencode-agent[bot] <opencode-agent[bot]@users.noreply.github.com> Co-authored-by: rekram1-node <rekram1-node@users.noreply.github.com> * fix(desktop): new session not selecting tab * fix(desktop): clone pty session on reconnect * add experimental.open_telemetry config option to enable OTEL spans (anomalyco#4978) Co-authored-by: noamzbr <noamzbr@users.noreply.github.com> Co-authored-by: opencode-agent[bot] <opencode-agent[bot]@users.noreply.github.com> Co-authored-by: rekram1-node <rekram1-node@users.noreply.github.com> * ignore: regen sdk * fix(desktop): prompting * fix(desktop): terminal cursor position * feat: add max steps for supervisor and sub-agents (anomalyco#4062) Co-authored-by: opencode-agent[bot] <opencode-agent[bot]@users.noreply.github.com> Co-authored-by: rekram1-node <rekram1-node@users.noreply.github.com> * tweak: bash tool improve output metadata for agent consumption, fix small timeout issue (anomalyco#5131) * OpenCode Desktop app (anomalyco#5044) Co-authored-by: Adam <2363879+adamdotdevin@users.noreply.github.com> * Update Nix flake.lock and hashes * release: v1.0.134 * sync: record last synced tag v1.0.134 * chore: format code --------- Signed-off-by: Jérôme Benoit <jerome.benoit@piment-noir.org> Co-authored-by: YeonGyu-Kim <code.yeon.gyu@gmail.com> Co-authored-by: GitHub Action <action@github.com> Co-authored-by: wsx99outlook <247713593+wsx99outlook@users.noreply.github.com> Co-authored-by: Frank <frank@sst.dev> Co-authored-by: Aiden Cline <aidenpcline@gmail.com> Co-authored-by: Adam <2363879+adamdotdevin@users.noreply.github.com> Co-authored-by: Daniel Gray <DanielFGray@gmail.com> Co-authored-by: Shantur Rathore <i@shantur.com> Co-authored-by: Daniel Polito <danielbpolito@gmail.com> Co-authored-by: Aiden Cline <63023139+rekram1-node@users.noreply.github.com> Co-authored-by: opencode-agent[bot] <opencode-agent[bot]@users.noreply.github.com> Co-authored-by: Jérôme Benoit <jerome.benoit@piment-noir.org> Co-authored-by: Dax Raad <d@ironbay.co> Co-authored-by: Cason Adams <casonadams@gmail.com> Co-authored-by: opencode <opencode@sst.dev> Co-authored-by: opencode-agent[bot] <219766164+opencode-agent[bot]@users.noreply.github.com> Co-authored-by: ry2009 <134240944+ry2009@users.noreply.github.com> Co-authored-by: Julian Visser <12615757+justmejulian@users.noreply.github.com> Co-authored-by: Anthony Shew <anthonyshew@gmail.com> Co-authored-by: rekram1-node <rekram1-node@users.noreply.github.com> Co-authored-by: Noam Bressler <noamzbr@gmail.com> Co-authored-by: noamzbr <noamzbr@users.noreply.github.com> Co-authored-by: Nathan Thomas <nwthomas@me.com> Co-authored-by: Brendan Allan <brendonovich@outlook.com>

Enable AI SDK OTEL spans

7a7aaf4

- AI SDK emits Open Telemetry Spans when experimental_telemetry is true - Define an open_telemetry config field to control this flag (false by default)

Merge dev into opencode/issue219-20251202121734

c72e904

rekram1-node force-pushed the dev branch from 398b39a to 5013d64 Compare December 5, 2025 05:13

rekram1-node changed the title ~~Enable AI SDK Open Telemetry spans~~ add experimental.open_telemetry config option to enable the ai sdk spans Dec 5, 2025

rekram1-node changed the title ~~add experimental.open_telemetry config option to enable the ai sdk spans~~ add experimental.open_telemetry config option to enable OTEL spans Dec 5, 2025

Moved open_telemetry under experimental object

26a5556

Co-authored-by: rekram1-node <rekram1-node@users.noreply.github.com>

rekram1-node merged commit 864c098 into anomalyco:dev Dec 5, 2025
2 of 3 checks passed

noamzbr mentioned this pull request Dec 5, 2025

Feature Request: Add Langfuse Tracing #219

Open

jeantil mentioned this pull request Dec 10, 2025

[Question] detailed per-interaction telemetry (token counts and input composition) for opencode-model communications #2666

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add experimental.open_telemetry config option to enable OTEL spans #4978

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add experimental.open_telemetry config option to enable OTEL spans #4978

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noamzbr commented Dec 2, 2025

Related Issues

What this does

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Summary

Changes Made:

New Config Format:

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