agentlog-tool 0.2.3

A local, offline digest of your coding-agent sessions. Zero dependencies.

agentlog

What did your coding agent actually do today?

agentlog reads your local Claude Code and Codex session logs and answers that in a screen: which projects it worked on, which files it edited, what failed. All offline, no network, no API key.

Everything is organised by project, because that is the first thing you want to know. Sessions, IDs and token counts are still there — one flag away — but they are not the headline.

--html writes the same digest as a self-contained file you can drop in a chat or share with a teammate. It works offline, requires no server, and contains no external assets.

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30-second quickstart

pip install 'stillworks[all]'   # all five agent tools, including this one
pip install agentlog-tool       # or just this one (the command is `agentlog`)

agentlog today

# Or run from a checkout, no install needed — it is stdlib only:
cd /path/to/agentlog && python3 -m agentlog today

(The PyPI name is agentlog-tool because agent-log was already taken. The command, the module, and the repo are all just agentlog.)

Real output (2026-08-03, this machine):

22h 45m active across 4 projects · today, Mon 3 Aug

  r102-bench          22h 43m   25 files · 143 commands · 4 errors
      edited   parser.py, render.py, cli.py
      failed   cd /home/val/r102-bench; echo "total:"; du -sh . 2>/dev/…
               edit parser.py
  val                 22h 42m   17 files · 122 commands · 8 errors
      edited   .../.orchestrator/HANDOFF.md, .../codex-orchestrator/AGENTS.md
      failed   cd /home/val/relay && ls .orchestrator/ && echo "=== git…
  relay                2h 10m   no edits or commands recorded
  codex-orchestrator   5m 07s   no edits or commands recorded

  19 sessions · 6 claude, 13 codex · busiest 22:00–23:00
  projects overlap — agents ran in parallel, so their times sum past the total
  more: agentlog list · agentlog show ID · agentlog --sessions

Busiest project first; the files are the ones written most often, and failed names the command behind each error rather than just counting them.

Generate an HTML digest you can share:

agentlog today --html today.html
# then open today.html in a browser — no server required

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Commands

agentlog                        same as: agentlog today
agentlog today | yesterday | week
agentlog since DATE             ISO date (2026-07-15) or offset (3d, 12h, 2w)
agentlog show SESSION_ID        one session in full detail
agentlog list                   50 most-recent sessions as a compact table
agentlog list --all             all sessions (no row limit)
agentlog list --limit N         show at most N sessions

agentlog list (first 3 rows):

ID        PROJECT                   WHEN              DUR       SRC
--------  ------------------------  ----------------  --------  ------
019fc4b9  relay                     2026-08-02 23:05  6m 18s    codex
019fc4a7  relay                     2026-08-02 22:45  6m 41s    codex
019fc4a1  relay                     2026-08-02 22:39  4m 29s    codex

View flags:

--sessions        the old per-session view: one block per session, with IDs,
                  models, turn counts and token totals
--project NAME    only projects whose name or path contains NAME

Output flags:

--html FILE       write a self-contained HTML digest to FILE
                  (time commands only: today, yesterday, week, since)
--md [FILE]       Markdown to FILE, or stdout if FILE is omitted
                  (time commands only)
--json            JSON to stdout; works with all commands including list and show
--verbose         show parsing diagnostics (skipped-line counts)
--home DIR        override home directory; used by tests and CI

The AGENTLOG_HOME environment variable is equivalent to --home.

Exit codes: 0 normal, 2 usage or argument error, 130 stopped by ctrl-c, 141 the reader hung up (agentlog today | head, or | less quit with q). The last two are deliberately not 0: a digest that was cut off short reported nothing about your day, and agentlog today > digest.md && mail-it should not mail half of one.

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What it extracts and how

agentlog reads JSONL files in ~/.claude/projects/**/*.jsonl (Claude Code) and ~/.codex/sessions/**/*.jsonl (Codex). It never writes to those files or uploads anything.

For each session it derives:

Shown	Derived from
project	cwd field in first user record
start / end / duration	first and last timestamp fields seen
models	message.model in assistant records
user turns	type == "user" records that are a person typing — not tool results, not subagent prompts (see below)
files read	Read tool-use calls (input.file_path)
files written	Write, Edit, MultiEdit tool-use calls (input.file_path) and NotebookEdit (input.notebook_path); Codex patch_apply_end records, plus *** Update File: lines inside older apply_patch envelopes
commands	Bash tool-use calls (input.command); Codex custom_tool_call script snippets, plus older exec_command and apply_patch calls
errors	tool_result records with is_error: true; Codex command output with a non-zero exit code, a patch that would not apply, and an mcp_tool_call_end whose result is an Err
the failing command	the tool-use call the failed result points back at (tool_use_id / call_id)
tokens	message.usage.input_tokens, cache_creation_input_tokens, and cache_read_input_tokens in assistant records; Codex uses the final total_token_usage snapshot, falling back to summing the per-turn last_token_usage blocks in a log too old to carry it

A turn is a time you said something. Claude Code writes a type: "user" record for three different things, and only one of them is a person: a tool result fed back into the loop is the agent's own machinery, and a record marked isSidechain: true is a prompt the agent wrote for a subagent. Counting all three reported 38318 turns across 896 real session logs where 2314 were typed, and one session read 3637 for a day with 211. That kind of error is worth more care than most, because a reader cannot catch it: an under-count can be checked by adding up the sources, but there is nothing to check an over-count against — it just reads as a long day. The subagent's work still counts; a pytest -x it ran is a command that ran. Only the prompt is not yours. A record with no isSidechain field at all — older logs — is counted, since dropping real turns would be the opposite mistake.

Tool-use IDs are deduplicated so streaming-split records are not double-counted. Malformed lines are skipped silently; their count appears under --verbose.

Codex has sent its work in two different shapes. Older sessions announce each command as a function_call named exec_command, with the command in a structured field. Current builds send a custom_tool_call instead: the record carries a snippet of JavaScript — tools.exec_command({cmd:"pytest -x", ...}), often several inside one Promise.all — and the command has to be read back out of the source. Both are parsed. Until v0.2.3 only the first was, which on the machine this was found on made 65.6% of the recorded Codex work invisible and left 74% of Codex sessions looking like the agent had done nothing; for the current month it was 98%. Nothing failed — the sessions were listed, with no commands and no files under them, which is exactly what a session of pure conversation looks like.

MCP tool calls are reported in their own record, and only a failed one is shown. A successful MCP call is not turned into a command — it is not a shell command, and the command list means one thing — so a session that spent its time in MCP tools will look quiet. Its failures will not: before v0.2.3 they were in a record nothing read, and four sessions on the logs this was found with reported 0 errors while an MCP server they had asked for was not running.

The read/written split is specific to Claude Code. Codex has no structured file-write field — it edits by handing a patch envelope to a patch tool — so its written files come from the patch_apply_end record, which names them absolutely and is also the only place a patch that failed is admitted. A patch that did not apply is counted as an error, never as a write.

Some builds never send that record: they hand the envelope to a custom_tool_call — sometimes bare, sometimes wrapped in a JavaScript string literal with the newlines escaped — and report nothing afterwards. A session that emitted no patch_apply_end at all therefore falls back to the *** Update File: / *** Add File: / *** Delete File: lines in the envelope itself. The fallback is decided per session, not per call: if the session sent even one end record, that build does report its own patches and the envelopes are ignored, because the end record knows which patches failed and the envelope does not. Listing an edit that never reached the disk is the worse error of the two — nothing else in the report contradicts it. Relative paths are resolved against the call's working directory, so one file is not counted twice under two spellings. Codex files it only reads are not distinguishable from any other shell command, and are not reported.

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Why this tool

You spent the day with Claude Code or Codex. What actually happened?

• Which files did it touch?
• How many commands did it run?
• Which sessions ran long?
• Where did things break?

That information is in your JSONL session logs, but reading raw JSONL is not practical. agentlog parses it and gives you a summary you can read in seconds.

The HTML output (--html) is meant to be shared: a single offline file containing the activity metadata of one or more sessions, useful for stand-ups, reviews, or just keeping your own notes.

Why not just ask my AI to summarize the logs? That works, but it involves sending your session logs to a model API. agentlog stays entirely local: it reads log structure, not content, and nothing leaves your machine.

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Prior art (and what is different)

Many tools read Claude Code JSONL logs. agentlog occupies a specific gap.

ccusage (ccusage.com) Token and cost tracking for Claude Code, Codex, and 15+ other agent CLIs. Daily/weekly/monthly summaries, per-project filtering, JSON output, MCP server. It reads the same files agentlog reads. Session data includes aggregate tool-call counts but surfaces them as numbers, not as enumerated file and command lists. agentlog is complementary: ccusage answers "what did it cost?" agentlog answers "what did it do?"

claude-code-log Python CLI that converts Claude Code JSONL transcripts to self-contained HTML or Markdown. Excellent for reading full conversation content. Works per-file or per-project. agentlog differs in focus: it shows metadata (files, commands, durations) rather than conversation content, and aggregates across multiple sessions in a time range.

claude-code-trace JSONL session viewer shipped as a native desktop GUI, web app, and TUI. Shows conversations, tool calls, and token counts per session with live tailing. No standalone HTML export and no cross-session time-range digest.

Claudoscope Native macOS menu bar app. Session browser, cost/token stats, generated-files view, full transcript, real-time secret scanning. macOS only, no CLI mode, no HTML export, not scriptable.

CASS — coding_agent_session_search Unified TUI and CLI for indexing and searching session history across 11+ agent providers using BM25 and semantic embeddings. SQLite-backed. A search tool, not a digest generator.

vibe-log-cli Daily activity summary for Claude Code and Codex sessions. Analysis is routed through ACP — it uses your local Claude Code or Codex instance to produce the summary rather than parsing JSONL structure directly. Requires a running agent.

agentlogs (agentlogs.ai) Cloud-based team observability: captures and uploads session transcripts. Requires login and network upload.

agent-sessions Local-first macOS app for browsing, searching, and resuming sessions across many providers. macOS only, no CLI, no HTML export.

claude-session-analyzer Quantitative behavioral analysis: thinking depth, Read/Edit ratio, rework indicators. Aimed at workflow optimization, not readable activity digests.

Where agentlog fits: agentlog list and agentlog show are the scriptable, terminal-native way to browse sessions without launching a GUI or browser. agentlog --html produces a self-contained offline file for sharing — the existing GUI tools are session-by-session viewers, not cross-session digest generators.

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Honest limits (v0.2)

Schema drift. Claude Code and Codex change their log formats without notice. Fields that agentlog reads today may move or disappear. Parsing is defensive and will not crash, but some sessions may show empty file or command lists if the format changes. That has already happened once, and is the worst failure this tool has: an empty list is indistinguishable from a quiet session, so a whole format going unread looks like the agent was idle rather than like a bug. Both known Codex shapes are parsed side by side rather than one replacing the other, and --verbose names files that could not be read at all.

A log file it cannot read is named, not skipped. A file whose permissions changed, or one truncated mid-write into bytes that no longer parse, cannot contribute a session — and until v0.2.3 it contributed nothing to the report either, including any mention that it existed. One good file beside two broken ones reported "1 session", in today, in list and in --json alike, which is the wrong answer in the direction that looks fine. Every view now ends with

note: 2 log files were not counted — 1 could not be read, 1 had no readable records
      (run with --verbose to see which)

and --verbose names the paths. Under --json and --md - the note goes to stderr, so stdout stays the bare array or the bare document. The exit code stays 0: agentlog reports, it does not gate. An empty file is deliberately not one of these — a session that has just started has nothing in it yet, and nothing has been lost.

Project identification is best-effort. The project is taken from the cwd field of the first user record in a session. If a session starts before a user record is written, the project falls back to a guess derived from the directory name, which is ambiguous when paths contain dashes.

Wall duration is elapsed time, not effort. A session's duration is (last timestamp – first timestamp) in its file; the logs contain no reliable elapsed-time field, so idle time between tool calls is included. The headline figure for a period is the union of all session intervals clipped to that period, not their sum — agents run in parallel, and summing them produced "111h in a 24h day". It therefore answers "how much of the day had an agent working" rather than "how many agent-hours were spent".

A session that spans the window is counted only for its share of it. A session running from Tuesday to Friday appears in Wednesday's digest, but only the files, commands, turns and errors timestamped inside Wednesday are counted, and the duration shown runs from the first thing it did on Wednesday to the last — not from midnight. Leave a session open overnight, come back and run one command at 09:16, and clipping to the edge of the day reported 9h 16m active beside 1 command: every hour spent asleep counted as work. Sessions whose records carry no usable timestamps fall back to their lifetime totals.

Two clocks are involved, and the log's wins. The timestamps come from whichever machine wrote the log, which may be ahead of the one reading it — an NTP step, a resumed VM, a synced home directory. A named day runs to midnight, so events dated a few minutes into the future are still part of today; only yesterday and an explicit end actually clip. agentlog never treats the moment you ran it as the end of a window you did not ask to end.

Codex file tracking is partial. Written files come from patch_apply_end records, falling back to patch envelopes in the command text, which together cover Codex's normal edit path. A file changed some other way — sed -i, a heredoc, a script the agent wrote and then ran — is not detected, and files Codex only reads are never reported. So a Codex project's file list is a floor, not a complete account.

The digest is a summary, and summaries drop things. Per project it shows the three most-written files and the three most frequent distinct failures, and it lists at most eight projects before collapsing the rest into a count. Failures that differ only below their first line — the same heredoc run three times — are collapsed into one row with a (3x) marker. A failure the parser could find no name for is still counted in errors but has no row to print, so the count can exceed the list. Until v0.2.3 that was most of them: a Codex patch call carries no command, so every failed patch was nameless. They are now labelled with the files they touched. --sessions, agentlog show ID and --json give the unabridged version.

One item is one row. Everything on screen came out of a log file written by the agent being audited, so a command or path is flattened to a single line before it is printed. Otherwise a command containing a newline printed as several rows, each looking exactly like a real command that ran — commands (1): above three $ lines — and agents write multi-line heredocs all day. The row counts in the headers are the check, and they are only true if this holds. In agentlog show, a line longer than 400 characters is cut with a marker saying how much was dropped; --json always has the whole thing.

Tokens are not verified. Token counts come from usage fields in the logs. They may differ from what your billing provider records.

Message text is never shown. agentlog extracts metadata only: file paths, shell commands, durations, model names, and token counts. Conversation content is not extracted or displayed regardless of any flag.

No test coverage against the developer's real logs. The test suite uses synthetic fixtures. It cannot guarantee correct parsing of every schema variant in the wild.

Codex parallel workers are merged into one session. When Codex runs worker agents, all of them share one session_id and each writes its own file. They are one session, so they are shown as one row, with the commands and files unioned and the turns, errors and tokens added up. Times therefore span the whole fan -out rather than any single worker, and a per-worker breakdown is not available.

Until v0.2.3 the extra files were discarded and only the richest one kept. On the logs this was found with, that hid 299 of 616 commands in the 21 sessions that had more than one file, and 38 of the 42 discarded files contained commands the kept one did not.

A Claude Code record is counted once, in the file that had it first. Claude Code writes the same records into two files in two ordinary situations: claude --resume opens a new session id and copies the earlier transcript into it verbatim before appending anything new, and a copied or moved project directory leaves the same log under two names, neither a symlink. Each record carries its own uuid, so a uuid already counted is skipped. Files are read oldest first, by mtime, which means the sitting where the work actually happened is the one that reports it — a resume shows the work done in the resume, and the earlier sitting keeps its own. Timestamps are skipped along with the counts, so a resume does not inherit the earlier sitting's start time and look like a session that had been running since the morning.

This is the opposite treatment from Codex above, and deliberately so: Codex's several files are parallel workers whose separate work genuinely adds up, while Claude's are copies of one worker's. Merging is only safe once the records are known to be distinct.

Until this was fixed, on the developer's own 269 Claude sessions the totals were inflated by 163 commands, 14 written files, 20 errors, 101 turns and 31.1M input tokens. No session was lost — a file that is nothing but replay contributes no counts and is not reported as unusable either, since none of its content is missing from the report.

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Privacy

agentlog is strictly local. No network code. Nothing is uploaded or sent.

It shows metadata only: file paths, shell commands, durations, and model names. Message text is never extracted or displayed.

The HTML digest may contain file paths and shell commands from your sessions. Review it before sharing it with others.

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Install

# From source (no install — works immediately):
python3 -m agentlog today

# Install for the current user:
pip install --user .

# Or in a virtualenv:
python3 -m venv .venv
.venv/bin/pip install .
.venv/bin/agentlog today

Requires Python 3.9 or later. Zero runtime dependencies.

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Running the tests

python3 -m unittest discover -s tests -v

The tests use synthetic JSONL fixtures in a temporary directory. No real home directory is touched. Pass --home DIR or set AGENTLOG_HOME=DIR to redirect agentlog to a different home in any context.

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Part of a small family

Five tools for working with coding agents, same house style: zero dependencies, MIT, no API key, nothing leaves your machine. None of them call a model — that is the point, since the thing being checked already is one.

Each of those four claims is a test rather than a promise, in tests/test_family_claims.py: every import resolves to the standard library or to this package, nothing that can open a socket is imported, no environment variable that looks like a credential is read, and no model SDK or provider hostname appears anywhere. A claim repeated in five READMEs and checked in none of them would read as five agreements when it was one assertion.

• stillworks — record what your code does now, catch when it changes later
• agentdiff — see what the agent actually changed, before you merge
• agentlog — what did your coding agent actually do today? ← you are here
• agentwatch — tail what your agent is doing, right now
• unedit — a safety net for letting an agent loose on your files

One install gets all five, and stillworks tools says which ones you have:

pip install 'stillworks[all]'
stillworks tools

License

MIT. Copyright (c) 2026 stillworks contributors.