Provides tools for analyzing OpenAI Codex task trajectories from local logs, including event timelines, turn/step summaries, token usage and cost estimates, and optional live stop controls.
Click on "Deploy Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type @ followed by the MCP server name and your instructions, e.g., "@codex-trajectory Show the safe trajectory summary for this Codex task."
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
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Version 1.0.0 · October 2, 2026 · Changelog
See what happened in a Codex task, where time went, and how many tokens it used.
Codex Trajectory is a plugin that turns local Codex logs into a searchable event ledger and interactive timeline. Open it from the app list under … in Codex's left toolbar for a fullscreen viewer, or from a task's right panel.
Captured from the current viewer on October 2, 2026, using synthetic demo data.
Task history: messages, saved reasoning summaries, tool calls, subagent activity, and context compaction.
Timing and failures: event durations, execution status, and a timeline to locate slow calls.
Tokens and cost: task and turn totals, cache usage, and estimated cost.
Live activity: a scrolling event stream, token totals, cost estimates, and the latest available local quota sample.
History browsing: search, event filters, task switching, and earlier records, including compressed and paginated logs.
Steps are approximate, and reasoning summaries appear only when saved in the log. Cost figures are estimates based on bundled API prices, not a Codex subscription bill. Local quota samples may lag the account service.
Related MCP server: agent-activity
You need Codex and uv. The plugin runs on macOS, Linux, and Windows.
codex plugin marketplace add icesixgod/codex-trajectory
codex plugin add codex-trajectory@icesixgodOpen a new Codex task to load the plugin. After updating an existing installation, fully quit and reopen Codex.
Open … in Codex's left toolbar and choose Codex Trajectory for a fullscreen viewer; you can pin it to the toolbar. You can also select + → More tools… → Plugins and MCPs → Codex Trajectory in the task's right panel.
Browse the timeline and event ledger. Use search and filters to find a record; select it to inspect it.
Click Live window to follow activity, or Load earlier records to browse history.
Both native entries open without a model turn. With valid task context, the viewer opens that exact task; without available task context, it shows a local task selector.
You can also ask Codex:
Show the safe trajectory summary for this Codex task.
For logs larger than the default 512 MiB read limit, choose a sufficient Read limit (GB) and click Enable and retry. The higher limit applies only to that task in the current panel; large logs take longer to scan.
The viewer starts with a safe summary: tool inputs, outputs, and raw metadata are hidden. Load full details asks for confirmation before exposing bounded details to the active conversation. Its checkbox can remember your choice for all tasks on this device; Restore safe summary default clears that preference. Live views always use safe summaries.
Source logs remain unchanged. Base instructions and encrypted reasoning are never returned. The Python runtime has no telemetry or application network requests; uv may download Python and dependencies during setup.
See PRIVACY.md for the complete privacy model.
Tool | Use |
| Find recent local tasks. |
| Read structured trajectory data. |
| Open the interactive viewer. |
Pass an explicit sessionId to read a specific task. Without one, the public read/show tools select the most recently modified active task, which may differ from the current task. See the interface reference for arguments, pagination, and schemas.
uv sync --group dev
uv run ruff format --check .
uv run ruff check .
uv run mypy
uv run pytestSee CONTRIBUTING.md for browser tests and release checks, the native viewer guide for migration and troubleshooting, and CHANGELOG.md for changes.
MIT. Parts of the ledger, timeline, and inspector are adapted from DeepSeek's MIT-licensed DeepSeek Harness trajectory UI, copyright © 2026 DeepSeek. See NOTICE and the upstream license. This is an independent project, not affiliated with or endorsed by DeepSeek.
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