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 commands/dash0hq/dash0-agent-plugin/open-sessiongit clone --depth 1 https://github.com/dash0hq/dash0-agent-pluginWhat 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 | $0.00012 | $0.00171 |
| Opus 5 | $0.00006 | $0.00086 |
| Sonnet 5 | $0.00002 | $0.00034 |
| Haiku 4.5 | $0.00001 | $0.00017 |
Grade A, and why
open-session scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Open Session
Prints the Dash0 session URL and opens it in the browser.
Steps
- Get the session URL by running:
echo '{"session_id": "<current_session_id>"}' | CLAUDE_PLUGIN_OPTION_OTLP_URL="${CLAUDE_PLUGIN_OPTION_OTLP_URL}" DASH0_OTLP_URL="${DASH0_OTLP_URL}" "${CLAUDE_PLUGIN_ROOT}/claude/claude-on-event.sh" session-url
Replace <current_session_id> with the session ID from $CLAUDE_SESSION_ID.
-
Print the URL to the user.
-
Open it in the default browser:
- macOS:
open <url> - Linux:
xdg-open <url>
- macOS:
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.
- 2d ago First seen · 24 lines · 12 tokens per session scan A 6cb4a0c0bfbd
open-session is a command published in the GitHub repository dash0hq/dash0-agent-plugin (5 stars, last pushed yesterday), licensed Apache-2.0. It adds 12 tokens to every session and 171 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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