Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/ob-labs/agentseek/langsmith-tracenpx skills add ob-labs/agentseek --skill langsmith-tracegit clone --depth 1 https://github.com/ob-labs/agentseekWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/ob-labs/agentseek/langsmith-trace)<a href="https://agentmods.dev/skills/ob-labs/agentseek/langsmith-trace"><img src="https://agentmods.dev/badge/skills/ob-labs/agentseek/langsmith-trace.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00054 | $0.01936 |
| Opus 5 | $0.00027 | $0.00968 |
| Sonnet 5 | $0.00011 | $0.00387 |
| Haiku 4.5 | $0.00005 | $0.00194 |
Grade C, and why
langsmith-trace scanned grade C with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Downloads and executes remote codehighSupply chain
curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.
curl -sSL https://raw.githubusercontent.com/langchain-ai/langsmith-cli/main/scripts/install.sh | sh Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -sSL https://raw.githubusercontent.com/langchain-ai/langsmith-cli/main/scripts/install.sh | sh How it starts
The opening of the file, as written. The whole thing — 220 lines — stays where its author put it; the contents beside it link to each section on GitHub.
LangSmith Trace
Add tracing to your agent and query traces for debugging. Supports Python and TypeScript.
[!IMPORTANT] This skill is tuned for AgentSeek template backends (LangGraph + middleware stacks). For general LangSmith concepts, see the upstream langsmith-skills repo.
[!CAUTION] Never pass
--api-keyas a CLI flag or expose API keys in shell commands / tool calls. The CLI readsLANGSMITH_API_KEYfrom the environment automatically. Using--api-key <value>leaks secrets into shell history, process listings, and agent tool-call logs. Always rely on the environment variable set in your shell profile or.envfile.
Installation & Setup
1. Install the CLI
curl -sSL https://raw.githubusercontent.com/langchain-ai/langsmith-cli/main/scripts/install.sh | sh
The binary installs to ~/.local/bin/langsmith. If langsmith is not found after install, add to your shell profile:
echo 'export PATH="$HOME/.local/bin:$PATH"' >> ~/.zshrc
source ~/.zshrc
2. Set your API key (environment variable only)
Add to ~/.zshrc (or the template's .env file) — the user must fill in their own key:
export LANGSMITH_API_KEY=<your-key-here> # starts with lsv2_pt_
Key format must start with lsv2_pt_. Get yours at https://smith.langchain.com/settings.
The CLI reads this env var automatically — never use --api-key flags. Do not echo, print, or pass the key value in any shell command or tool call argument.
3. Verify
langsmith project list
If you see a JSON array of projects, you're set. Common failures:
command not found—~/.local/binnot in PATH (see step 1)- 401 Unauthorized — key is wrong or expired; regenerate at LangSmith settings
- Empty array
[]— valid auth but no projects yet; create one in the UI or run a traced app
Adding Tracing
LangGraph / LangChain apps (automatic)
Just set environment variables — no code changes needed:
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 5d ago First seen · 220 lines · 54 tokens per session scan C 59dae834606d
langsmith-trace is a skill published in the GitHub repository ob-labs/agentseek (173 stars, last pushed 2d ago), licensed Apache-2.0. It adds 54 tokens to every session and 1,936 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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