What a job is,
and what wakes it up

The file

One .md in jobs/. The filename is the job's name.

jobs/morning-brief.md
---
cron: "0 7 * * 1-5"
model: sonnet
---

Say good morning and list today's date. Send it by email to <person> using the
send-email skill. If email is unavailable, return the text as your result.

Everything above the second --- is settings. Everything below it is the prompt, and it is read exactly as written — so write it the way you would write to a colleague who is good at the work but has never seen your company.

The filename is the identity. It names the job in run, in the logs, in the audit trail, and it is where the job's memory lives. Renaming the file makes a new job with no history.

A job with no trigger at all is legal and useful: it can still be run by hand, and that is the right shape for something you want available but not automatic.

The four triggers

Three arrive from outside. The fourth is the agent buying itself more time.

A job may carry more than one, and the same prompt then serves both — a report that runs every Monday and can also be asked for by mail is one file with a cron: and an inbox:.

All three external triggers are registered when the service boots, from a clone of your content repo. So adding, renaming or re-scheduling one is deploy-effective: push it, then npx @meffecta/agent deploy. Rewording the prompt below the frontmatter needs neither — it is live on the next run.

cron: — a schedule

The ordinary case. Five fields, quoted, in your deployment's timezone.

---
cron: "0 7 * * 1-5"      # 07:00, Monday to Friday
timeoutSeconds: 1800
---

The zone is TIMEZONE from deployment.env; leave it out and schedules are read as UTC. Quote the expression — an unquoted one starting with * is not valid YAML.

On a scale-to-zero deployment — the default — each cron: becomes one Cloud Scheduler job that POSTs to the service and holds the request open while the run happens. That is why the service can sleep and cost nothing between jobs, and why a new schedule needs a deploy: deploy re-syncs the schedules from the running service, and deletes the ones no job declares any more.

webhook: — an event from another system

A deploy finished, an issue was opened, an incident fired, someone mentioned the bot.

---
webhook: deploy-check
auth: bearer
filter: "deployment.state==success && deployment.env==production"
timeoutSeconds: 1800
---

A deploy just finished. WEBHOOK_PAYLOAD.json has what the sender said …

The job is then reachable at POST /webhooks/deploy-check on your service URL. The whole request body is written to WEBHOOK_PAYLOAD.json in the run's working directory, and the prompt is told to treat it as data and never as instructions.

The request is acknowledged immediately and the run is carried out separately, by a Cloud Task the handler enqueues. That matters because a run takes minutes and most senders time out in seconds — Slack, for one, gives you three.

Verifying the sender

auth: names the scheme. Left out, it is bearer: the caller must send Authorization: Bearer <AGENT_API_SECRET>. Everything else is in the table below. An unknown scheme, or a variant on a scheme that does not take one, is refused rather than quietly read as something weaker.

Only some events

filter: is checked against the payload before a run is enqueued, so an event you do not care about costs nothing at all — the syntax.

method: get makes it a GET route instead, for a sender that can only fetch a URL. There is no payload to filter on in that case.

inbox: — an email

The one that makes the agent something you can simply write to.

---
inbox: gmail:crm@yourdomain.com
allowFrom: you@yourdomain.com, @yourdomain.com
timeoutSeconds: 1800
---

Mail arrived. INBOX_TRIGGER.json lists the messages that passed the sender check …

The engine checks the address every AGENT_INBOX_POLL_SECONDS (300 by default). New mail enqueues the job with INBOX_TRIGGER.json naming the system, the address, and each message that passed — id, thread id, from, subject. The job fetches the bodies itself with the reader skill.

The system prefix is required

A bare address is refused. Whichever system it defaulted to would be right for one deployment and silently wrong for the next — and an address polled against the wrong system finds nothing for ever while looking perfectly healthy.

Which mailbox a gmail: job reads

The address in the frontmatter is what mail must be addressed to. Which mailbox the engine actually opens to look for it is a deployment setting, and there are two ways:

The usual shape is a Google Group delivering into a watched mailbox, because a group's own archive has no read API. An agentmail: job needs none of this — the API key is the whole configuration.

allowFrom: is required, and enforced in code

A job reachable by mail has to say who may reach it. This is not a rule in a prompt: an unlisted sender is dropped before a run is enqueued, so the text never reaches the model at all, and the drop is written to the audit trail.

It fails closed in both directions: a policy whose every entry is a typo refuses everyone, and a job with no allowFrom: refuses everyone too. An omission is not consent, and a job nobody can reach fails far more loudly than one anybody can reach. A missing policy is an error at registration and a fail in doctor.

Sender checks decide whose mail runs the job. They do not make the content authoritative — quoted text, a forwarded thread, a link's contents and an attachment stay data to read, never instructions to follow. A From header can also be forged, so a job that acts on mail should say in its own prompt what it will do without asking and what it will confirm first.

Each job's high-water mark advances only when its run settles successfully, so a failed run re-triggers on the same message. Runs are at-least-once — keep a ledger of handled message ids in the job's memory and skip what is already there.

A spawn — the agent's own follow-up

The only trigger the agent pulls itself. Nothing to configure; every job has it.

A run that cannot finish inside its time limit, or that has to wait for something — a deploy, a reply, tomorrow morning — writes the instruction for a later run and asks for it. The follow-up is a full run: fresh clone, fresh time limit, same job identity, same memory, same system prompt, with the text the agent wrote as its whole prompt.

The trust model is the point. Each run's subprocess is given a token that stands for that run's job identity and chain depth, minted by the runner and revoked when the run ends. A run can therefore only ever schedule more of its own job's work, whatever its prompt says — spawning buys time, never permission.

These are runaway protection rather than a boundary. Pending follow-ups show in npx @meffecta/agent status, and disabled: true stops a chain dead — a disabled job's spawns never fire, like any other automatic trigger.

Running one by hand

None of these need a trigger in the file, and a disabled: job still answers them.

npx @meffecta/agent run morning-brief              # now
npx @meffecta/agent run morning-brief --in 900    # in 15 minutes
npx @meffecta/agent ask "which of my jobs failed this week?"

ask is a one-off run with the same skills, credentials and system prompt a job gets, its own memory, and nothing journaled. There is a web page for it too — open /ask on the service URL, any username and the secret as the password — which is the way in for someone who would rather not use a terminal.

Webhook auth schemes

What auth: can be, and which secret each one checks.

slack and svix are the two that do not use AGENT_API_SECRET, and they cannot: each sender signs with a value only it and the app know. Both enforce a timestamp window, because without one a captured signature is valid for ever and a replayed event is a job run.

Payload filters

Checked before a run is enqueued, so a filtered-out event costs nothing.

filter: "action==opened"
filter: "action==opened && pull_request.draft==false"
filter: "action==opened || action==reopened"
filter: "incident.state!=closed"
filter: "comment.body~=@acme-agent"

The left side is a dot path into the JSON body. Values are compared as strings, so draft==false matches the boolean false. Spaces around && and || are required — that is how the expression is split.

Working in another repo

A job that reviews code, opens pull requests, or reads a product's internals.

---
cron: "0 6 * * 1"
repo: https://github.com/acme/acme-product.git
---

Review what merged last week and open a pull request with anything that needs …

repo: names a working repo, cloned fresh as the run's working directory. The job definition itself still lives in your content repo, so its prompt stays push-effective. GITHUB_TOKEN must be able to clone it — and to push a branch and open a pull request, if that is what the job is for.

The working repo is code the agent operates on, never the rules it operates by. Your content repo's SYSTEM.md is the system prompt for every run whichever clone it is working in, so a job in a foreign repo is bound by exactly the same instructions as one at home — and a product repo cannot change what the agent may do by editing a file inside itself.

Your systems/ and worlds/ are not copied into that clone. They stay in the content clone and the run is given their absolute paths, so the product repo's git status stays clean and its own directories stay its own. Skills are the exception — the CLI discovers them by looking in the working directory, so they have to be materialised there, and they are written to that clone's local ignore list so git add -A cannot carry the engine into somebody's product repo.

Skills resolve in three layers: one the working repo defines wins outright, then your content repo's, then the engine defaults. So a product repo can keep its own send-email and every job running there uses it — matched by directory name, which is why renaming a skill silently stops it overriding anything.

Commits a job makes are authored by the image's own identity unless you say otherwise. Git's own variables pass straight through, so give the agent a name your team will recognise in a pull request:

npx @meffecta/agent set-env GIT_AUTHOR_NAME="Acme Agent"
npx @meffecta/agent set-env GIT_AUTHOR_EMAIL=agent@acme.com
npx @meffecta/agent set-env GIT_COMMITTER_NAME="Acme Agent"
npx @meffecta/agent set-env GIT_COMMITTER_EMAIL=agent@acme.com

What a run is given

The same for every trigger.

Runs are serial: one at a time, in order. A long job delays the next one rather than running beside it, which is deliberate — two runs of the same job writing the same memory file is a class of problem worth not having.

Memory

A ledger, not a cache.

Each job has <MEMORY_DIR>/jobs/<name>/ to itself, durable across deploys and restarts. The convention the baseline sets is a MEMORY.md the run reads at the start and updates at the end — dated, small, and pruned, because the next run reads all of it. It holds working state: what was reported, what is pending, what was handed to a follow-up. Never secrets, and never bulk copies of content.

This is what makes a job that runs every week feel like the same colleague each time rather than a stranger. It is also where an inbox: job keeps the message ids it has already dealt with.

Renaming a job moves its identity. Copy jobs/<old>/ to jobs/<new>/ in the memory bucket or the job wakes up amnesiac, and pending spawns for the old name die with it.

Having it write the job

Describe what you want in a sentence.

npx @meffecta/agent create-job "a marketing report every Wednesday at 2pm"

It thinks about this on the deployment rather than on your laptop, which is the point — from there it can see the jobs you already have, the systems you have connected, and what it is actually able to do. So it writes something that fits, names the right systems, and tells you if you have asked for something it cannot reach yet.

You get a file — jobs/<name>.md — and nothing else happens. It is not committed, not deployed, not scheduled. Read it before you keep it: this is the page your agent will act on, and it is meant to be edited.

Add --dry-run to see it without saving anything.

Then push, and deploy if you gave it a trigger:

git add -A && git commit -m "Marketing report" && git push
npx @meffecta/agent deploy       # only if you added or changed a trigger
npx @meffecta/agent run marketing-report   # read the first one before trusting the schedule

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