20 No-Code Marketing Agents You Should Build Today: Ideas, Tools and the Method

Using Claude Projects (manual agents)

1. Sign in at claude.ai and click Projects in the sidebar, then New Project. Name it after the agent ("Pre-call Briefing Agent").
2. Click Set project instructions and paste your job description: task, input, output format, rules. These instructions apply to every conversation inside the project, so you never re-explain the job.
3. Under Project knowledge, upload the reference files the agent should always consult: ICP, voice guide, examples of great output, your service list.
4. To run the agent, open a new chat inside the project and paste only the input (a domain, an article, a keyword CSV). Claude applies the instructions automatically.
5. When output misses, do not correct it in chat and move on, edit the project instructions so the fix is permanent. The instructions document is the agent.

Using Claude inside workflow tools (automated agents)

1. Create an API key at console.anthropic.com (sign up, then API Keys, Create Key, copy it once and store it safely).
2. In your workflow tool, add the Anthropic app or node and paste the key when it asks to connect.
3. Put your tested job description in the system prompt field and map the run's data into the user message field.
4. If a later block needs to read specific parts of the answer, end your prompt with "Respond only in JSON with the keys: ..." so the output splits cleanly into fields.

Step by step

1. At zapier.com, click Create, then Zap. A Zap is one agent: a trigger followed by action blocks.
2. In the trigger block, search for your starting app, for example Google Sheets, New Spreadsheet Row or Schedule by Zapier, Every Week. Connect the account, pick the sheet, and click Test trigger to pull in a real sample row.
3. Click + to add an action. Search Anthropic, choose the send message action, and connect with your API key.
4. Paste your job description into the prompt, then click into it and select the trigger's fields (company name, domain, alert text) exactly where the input belongs. The sample data shows you what each field contains.
5. Add the review action next: Google Sheets, Create Spreadsheet Row into your "Review queue" tab, or Slack, Send Channel Message with the draft.
6. Click Test step on each block, confirm the draft looks right, then hit Publish. The Zap now runs on every trigger event; the Zap History page is your run log.

Good to know: Zapier's free tier handles two-step Zaps; multi-step agents like these need a starter plan. Use "Filter by Zapier" between steps to stop runs that do not meet a condition, for example only continue when Claude's confidence field says high.

Make, step by step

1. At make.com, click Create a new scenario. You get a canvas; each circle is a module and you drag connections between them.
2. Click the first circle and choose your trigger module (Google Sheets, Gmail, Schedule). Connect the account and set the polling interval.
3. Add the Anthropic Claude module next, paste the prompt, and map fields by clicking the purple tokens from earlier modules.
4. Add an Iterator when the trigger returns lists (multiple alerts, multiple rows) so Claude processes items one at a time.
5. Finish with the review module (Sheets row or Slack message), click Run once to test with live data, then set the schedule and save.

n8n in brief

n8n works the same way, a canvas of connected nodes, with two differences that matter later: you can self-host it free, and its AI Agent node can hold a system prompt, memory and multiple tools in one block, which suits heavier builds like Agent #9's weekly prompt runs. Start on n8n cloud, create a workflow, add a trigger node, an Anthropic node and your review node, then activate.

Choosing: Zapier for your first agent, Make when you need branching, iteration or cheaper high-volume runs, n8n when agents multiply and you want them under one self-hosted roof.

Step by step

1. Create one spreadsheet per agent with three tabs: Inputs (what the agent works through), Review queue (what it produced), Log (every run, timestamped).
2. In Review queue, use fixed columns: Date, Input, Draft output, Status, Reviewer notes. Add a dropdown on Status via Data, Data validation with the values Pending, Approved, Rejected.
3. Point the workflow's post-Claude step at this tab with Create Spreadsheet Row, mapping the draft into "Draft output" and setting Status to Pending.
4. Reviewing takes minutes: read the draft, set Status to Approved or Rejected, add a note when rejecting, notes become your prompt fixes.
5. Build a second tiny workflow with the trigger New or Updated Spreadsheet Row, filtered to Status = Approved, that performs the real action: send the email, schedule the post, update the CRM.

Why this pattern: the sheet is simultaneously the human checkpoint, the audit log and the dataset you will later use to improve prompts. Airtable and Notion work identically if you prefer them.

Putting it all together

1. Google Alerts (5 min): at google.com/alerts, create an alert per target account, for example "Acme Corp" funding OR hiring OR launch. Set delivery to your Gmail, frequency "as-it-happens".
2. Sheet (3 min): create the three-tab spreadsheet from the Sheets guide above.
3. Zap trigger (5 min): new Zap, trigger Gmail, New Email, filtered to sender googlealerts-noreply. Test to pull in a sample alert.
4. Claude step (10 min): add Anthropic, and paste: "You are a B2B intent-signal analyst. From this alert, decide whether it is a genuine buying signal for an agency selling marketing services. Classify the signal type (hiring, funding, launch, leadership, other), state confidence high, medium or low, and write two sentences on why it matters. Respond only in JSON with keys: signal_type, confidence, why_it_matters, company." Map the email body field into the message.
5. Filter (2 min): add Filter by Zapier, only continue when confidence is high.
6. Deliver (5 min): add Slack, Send Channel Message to your sales channel: company, signal type, the why-it-matters note and a link to the source. Also append every run to the Log tab.
7. Test and publish: run three past alerts through, tighten the prompt if it overreacts to routine news, publish.

That is the whole method in miniature: a free monitor as the trigger, Claude as the judgement, a filter as the guardrail, Slack as delivery, a sheet as the log. Every other agent in this guide is a variation on these thirty minutes.

What it does

On a weekly schedule, it pulls fresh companies from a lead database using your ICP filters (industry, headcount, geography, tech stack), asks Claude to score each one against your criteria and explain which matched, removes anything already in your CRM, and drops the survivors into a review sheet.

Tools you need

What it does

Whenever a new record lands in your CRM, it enriches the contact with firmographics, verifies the email is deliverable, and uses Claude to tidy the messy bits: standardising job titles, fixing company name variants, normalising countries. Records that fail checks get flagged instead of guessed.

Tools you need

What it does

Google Alerts (or a listening tool) watches your target accounts for news; each alert flows into Claude, which decides whether it is a real buying signal, which type, and writes a two-sentence "why this matters" note. Only high-confidence signals reach your sales Slack channel.

Tools you need

What it does

Give it a company domain and it reads the website and recent news, then produces a fixed-format brief: what the company does, current priorities, likely pain points mapped to your services, talking points and questions to ask, with anything unverified clearly marked "unconfirmed". As a Claude Project, this needs no other tool at all.

Tools you need

What it does

For each contact in your campaign sheet, Claude reads the prospect's website and drafts a short email built on one specific, verifiable observation, not "loved your recent post" filler. Drafts land back in the sheet, then flow into your sequencer as unsent drafts for approval.

Tools you need

What it does

Every reply is classified by Claude as interested, question, objection, referral, out of office, not now, or unsubscribe. Unsubscribes are suppressed instantly, out-of-office replies pause the sequence, and interested replies ping a rep in Slack with a suggested response attached.

Tools you need

What it does

Instead of a fixed drip, Claude looks at each lead's behaviour, pages visited, content downloaded, time since last touch, chooses the single best next asset from a menu of your content, and drafts a short email around it: a case study for the pricing-page visitor, a gentle nudge for the gone-quiet lead.

Tools you need

What it does

A deliverability tool tests your inbox placement and domain health continuously; the agent pipes those results plus your sequencer's bounce and complaint numbers to Claude daily, which writes a plain-language health report, and raises an alarm, with sequences paused, the moment something breaches a threshold.

Tools you need

What it does

You maintain a sheet of buyer-style prompts ("best X for Y", "alternatives to Z"). Weekly, the workflow runs each prompt through an AI step and Claude parses every response: was your brand mentioned, at what position, with what sentiment, which competitors and sources appeared. Results append to a tracker so a trendline builds week by week.

Tools you need

What it does

A Claude Project holding your citability rubric: answer-first openings, question-form headings, self-contained paragraphs, dated facts. Paste in any page URL or its text and it returns a rewrite specification, per-section verdicts, a rewritten opening, suggested headings and a quotable summary block, ready for your editor to apply in the CMS.

Tools you need

What it does

Paste a page URL or its content into a Claude Project loaded with schema templates, and it identifies the page type, generates the right JSON-LD (Article, FAQPage, Organization, BreadcrumbList), populated only from what is actually on the page, and hands you a ready-to-paste script block to validate in Google's Rich Results Test.

Tools you need

What it does

Export keywords from Ahrefs or Semrush, paste the CSV into Claude, and it groups queries by shared intent, names each cluster, checks which ones your existing pages already serve, and drafts a one-page brief for every gap: working title, target queries, questions to answer, structure and internal link suggestions.

Tools you need

What it does

Feed Claude your page list (a sitemap export or a crawl from Screaming Frog's free tier) plus the text of your under-linked pages, and it proposes specific link placements: which source page, which paragraph, what natural anchor text, ranked by relevance, delivered as a spreadsheet your editor works through.

Tools you need

What it does

A Claude Project holding your voice guide and three example posts that sound like you. Paste in any article or deck and it drafts five post variants, a story angle, a contrarian angle, a how-to, a data point, a question post, plus a slide-by-slide carousel outline. Approved posts go into your scheduler.

Tools you need

What it does

A listening tool tracks your brand, competitors and the problem language your buyers use; each mention flows through Claude, which discards vents, jokes and dead threads (correctly rejecting most of what comes in), and drafts a genuinely helpful reply for the rest, compiled into a morning digest a person posts from their own account.

Tools you need

What it does

On publish, Claude produces the full distribution pack from one source article: a newsletter edition, an X/Threads thread, a 60-second video script with on-screen text cues, podcast talking points and a community post variant, each formatted for its channel and checked so every number matches the source.

Tools you need

What it does

New reviews on Google Business Profile and other platforms trigger the workflow; Claude classifies each by sentiment and issue, then drafts a response following your playbook, thank, acknowledge the specific point, resolve or redirect, with hard rules on what it must never say. Drafts arrive in Slack for one-click approval, and negative reviews alert a senior person.

Tools you need

What it does

A listening tool collects brand mentions across news, forums and social; weekly, Claude scores each for sentiment and theme (product, support, pricing, people) and writes a scorecard with example quotes and week-over-week movement. A spike in negative mentions triggers an immediate alert outside the weekly cycle.

Tools you need

What it does

Visualping watches competitors' public pricing pages, homepages and blogs and fires an alert on any change; Claude filters trivial edits from strategic ones and writes a two-sentence implication note per real change, compiled into a Monday briefing with before/after excerpts. Public pages only, nothing behind logins.

Tools you need

What it does

Your key metrics flow weekly from analytics, CRM and email platforms into a Google Sheet (Looker Studio or native connectors handle this without code). Claude reads the sheet and writes a one-page narrative: what moved, the most likely why, what needs a decision, with a hard rule that every claim cites a number in the data and speculation is labelled as hypothesis.

Tools you need