custo-sessao

custo-sessao is a command for Claude Code from luanpdd/kit-mcp. It costs 33 tokens per session (1,114 once invoked), scanned A, original, MIT.

A cost-reporting command for one Claude Code session that identifies the active session or accepts a specific session ID, then shows spending and token usage by model.

In plain words
What is it for?
Use it to inspect a session’s start time, activity, total cost, model breakdown, and optional saved cost snapshot.
Why use it?
It helps connect model costs to one conversation instead of mixing them with a whole day or project.

Command for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: reads .claude/ paths; positional $N argument; mentions Claude Code.

Good fit Use it to inspect a session’s start time, activity, total cost, model breakdown, and optional saved cost snapshot.

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Install with agentmods
npx agentmods add commands/luanpdd/kit-mcp/custo-sessao
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.

Clone the repo
git clone --depth 1 https://github.com/luanpdd/kit-mcp

Made for: Claude Code.

Wrote 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.

agentmods badge for custo-sessao

README.md
[![agentmods](https://agentmods.dev/badge/commands/luanpdd/kit-mcp/custo-sessao/github.svg)](https://agentmods.dev/commands/luanpdd/kit-mcp/custo-sessao)
Your own site
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Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

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Your own site · 80×15
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Per session 33 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,114 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00033 $0.01114
Opus 5 $0.00016 $0.00557
Sonnet 5 $0.00007 $0.00223
Haiku 4.5 $0.00003 $0.00111

Measured 5d ago against content hash 153a7f81487a, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

custo-sessao 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 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.

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.

kit/commands/custo-sessao.md · 106 lines

How it starts

The opening of the file, as written. The whole thing — 106 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Auto-dedução: sem argumentos, busca o arquivo JSONL com mtime mais recente cujo idle ≤ 30min — assume que é a sessão ativa em curso. Útil para statusline / on-the-fly check.

Lê: o arquivo JSONL da sessão (~/.claude/projects/<slug>/<sessionId>.jsonl).

Cria/Atualiza: nada por default. Com --persist, grava em .planning/costs/<ts>-cost-session.json.

Após: o user vê session_id, started_at, last_activity_at, total_usd, breakdown by_model e flags de qualidade.

Disambiguation: sobre USD/tokens reais da sessão de chat Claude. NÃO é métricas internas do MCP server (use metrics-snapshot para isso). Ver skill cost-tracking.

  • <session_id> — UUID da sessão. Omita para auto-deduzir.
  • --refresh-pricing — opt-in models.dev fallback. Side-effects de rede + cache.
  • --persist — salva snapshot em .planning/costs/.

Cross-reference: SSOT do shape e do auto-deduz é a skill cost-tracking. Algoritmo de auto-dedução: arquivo JSONL com mtime mais recente cujo now - mtime ≤ max_idle_ms (default 30min).

1. Parsear argumentos

SESSION_ID=$(echo "$ARGUMENTS" | awk '{for(i=1;i<=NF;i++) if($i !~ /^--/) {print $i; exit}}')
REFRESH=$(echo "$ARGUMENTS" | grep -oE -- '--refresh-pricing' | head -1)
PERSIST=$(echo "$ARGUMENTS" | grep -oE -- '--persist' | head -1)

2. Invocar MCP tool cost-session

Chame cost-session com:

{
  "session_id": "<id ou omitir para auto-deduzir>",
  "refresh_pricing": <true se --refresh-pricing, senão omitir>,
  "persist": <true se --persist, senão omitir>
}

3. Renderizar resultado

═══════════════════════════════════════════════════════════
 kit-mcp ▸ COST-SESSION ▸ <session_id>
═══════════════════════════════════════════════════════════
 Iniciada: <started_at>
 Última atividade: <last_activity_at>
 Source: <source_file>

 Total: $<total_usd> | <entry_count> entries | pricing snapshot age: <pricing_staleness_days>d

 Por modelo:
 - <model>: $<usd> (<input_tokens> in / <output_tokens> out / <cache_read_tokens> cache_read)
 ...

 Qualidade:
 - dedup: <deduped_count>
 - skipped: <skipped_entry_count>
 - parse errors: <parse_error_count>
 - unknown_models: <list ou "none">

 [Se pricing_warning:] AVISO: <pricing_warning>
 [Se persisted_to:] Snapshot salvo: <persisted_to>
═══════════════════════════════════════════════════════════

Read the full file on GitHub · 106 lines

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. 5d ago First seen · 106 lines · 33 tokens per session scan A 153a7f81487a

Subscribe to this mod's changes

custo-sessao is a command published in the GitHub repository luanpdd/kit-mcp (1 stars, last pushed yesterday), licensed MIT. It adds 33 tokens to every session and 1,114 once invoked, about $0.0002 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 2026-09-03.