session-start

A command that starts recording a coding-agent session and captures it in the project's shared ledger. The ledger keeps decisions and working context available to the team.

In plain words
What is it for?
Use it when beginning or resuming worthwhile work, recording a feature or bug investigation, or sharing session context with teammates. It also explains setup and authentication problems.
Why use it?
It helps preserve what happened during feature work, debugging, or investigation so the context is not lost.

Command

Install

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.

agentmods
npx agentmods add commands/sageox/ox/session-start
Clone the repo
git clone --depth 1 https://github.com/sageox/ox
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 261 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.00261
Opus 5 $0.00000 $0.00130
Sonnet 5 $0.00000 $0.00052
Haiku 4.5 $0.00000 $0.00026

Measured 2d ago against content hash b1e68f3b2727, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

session-start 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.

claude-plugin/commands/session-start.md · 32 lines

What it actually says

Start recording this agent session to the project ledger.

Use when:

  • Beginning a new coding session you want captured
  • Starting work on a feature, bug fix, or investigation worth recording
  • You want decisions and context preserved for teammates
  • Resuming work after a break and want to record the new session

Keywords: session start, record, capture, begin, log, track, ledger, start recording

Common Issues

Already recording

Symptom: session already active or similar error Solution: A session is already in progress. Run ox agent <id> session stop first if you need to restart

No agent detected

Symptom: Agent ID is missing or unrecognized Solution: Run ox agent prime first to register this agent instance

Not initialized

Symptom: No SageOx configuration found Solution: Run ox init to initialize SageOx in this repository

Post-Command: Show Notice (REQUIRED)

After the command completes, check the JSON output for a notice field. If present, you MUST display the notice text to the user verbatim. This is a one-time transparency notice about session recording that the user needs to see.

$ox agent session start

Changes

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.

  1. 2d ago First seen · 32 lines · 0 tokens per session scan A b1e68f3b2727

Subscribe to this mod's changes

session-start is a command published in the GitHub repository sageox/ox (50 stars, last pushed 3d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 261 tokens. 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.