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Agent skill

Retellai Common Errors

by jeremylongshore in jeremylongshore/tons-of-skills-marketplace

Diagnose and fix Retell AI voice agent errors: call failures, webhook issues, voice quality.

MITAuto-check passedBackend & APIs

Install Retellai Common Errors

skills CLI
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill retellai-common-errors -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install jeremylongshore/tons-of-skills-marketplace retellai-common-errors --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/.curated/retellai-common-errors .claude/skills/retellai-common-errors && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
retellai-common-errors
GitHub stars
2.8k
Token cost
~881 tokens
SKILL.md length
261 words
Files
1
Skills in repo
3,342
Repo updated
First seen
Licence
MIT

At a glance

Diagnose and fix Retell AI voice agent errors: call failures, webhook issues, voice quality.

  • Encountering Retell AI errors
  • SKILL.md covers Overview, Prerequisites, Instructions and Output, plus 4 more sections
  • Needs RETELL_API_KEY
  • Debugging call issues

What it does

Retellai Common Errors is an agent skill from jeremylongshore/tons-of-skills-marketplace. Diagnose and fix Retell AI voice agent errors: call failures, webhook issues, voice quality. Use when encountering Retell AI errors, debugging call issues, or troubleshooting agents. Trigger with phrases like "retell error", "call failed", "voice agent not working", "retell debug".

Its SKILL.md is about 880 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts. Compatibility notes: Designed for Claude Code

It sits in Backend & APIs, covering Webhooks, Speech recognition and synthesis and Debugging. The repository describes itself as: Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com. The licence is MIT.

When your agent uses it

  • Encountering Retell AI errors
  • Debugging call issues
  • Troubleshooting agents
  • With phrases like retell error

Example prompts

  • “retell error”
  • “call failed”
  • “voice agent not working”
  • “/retellai-common-errors”

Requirements

  • A credential in RETELL_API_KEY
  • Compatibility (from SKILL.md): Designed for Claude Code
  • Pre-approved tools (allowed-tools): Read, Grep, Bash(curl:*)

What it can do on your machine

Read from SKILL.md and the folder at commit cfae287. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Grep
    • Bash(curl:*)

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are typescript).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Links to these hosts (documentation or services it may open):

    • docs.retellai.com
    • npmjs.com

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names these keys or tokens, usually read from environment variables:

    • RETELL_API_KEY

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

  • Compatibility

    Designed for Claude Code

    From compatibility in the SKILL.md frontmatter.

Context cost

Retellai Common Errors loads about 881 tokens when it runs. Until then it costs about 76 tokens; SKILL.md has 261 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~76
When it runs · the whole SKILL.md, loaded when a task matches
~881

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from jeremylongshore/tons-of-skills-marketplace at commit cfae287, republished under its MIT licence (© jeremylongshore). 261 words, ~881 tokens.

Download SKILL.mdSave it as .claude/skills/retellai-common-errors/SKILL.md (or your agent's skills folder).
name
retellai-common-errors
description
Diagnose and fix Retell AI voice agent errors: call failures, webhook issues, voice quality. Use when encountering Retell AI errors, debugging call issues, or troubleshooting agents. Trigger with phrases like "retell error", "call failed", "voice agent not working", "retell debug".
allowed-tools
Read, Grep, Bash(curl:*)
compatibility
Designed for Claude Code
version
1.9.0
license
MIT
author
Jeremy Longshore <jeremy@intentsolutions.io>
tags
saas, retellai, voice, telephony, debugging

Retell AI Common Errors

Overview

Quick reference for the top Retell AI errors and their solutions.

Prerequisites

  • retell-sdk installed
  • API key configured

Instructions

Error 1: 401 Unauthorized
RetellError: 401 — Invalid API key

Fix: Verify API key in Retell Dashboard. Ensure RETELL_API_KEY starts with key_.

Error 2: Call Fails Immediately
RetellError: 400 — Invalid phone number format

Fix: Use E.164 format: +14155551234. Both from_number and to_number must be valid.

Error 3: Agent Not Responding
Call connected but agent says nothing

Fix: Check LLM configuration:

typescript
const llm = await retell.llm.retrieve(agent.response_engine.llm_id);
console.log(`Model: ${llm.model}`);
console.log(`Prompt length: ${llm.general_prompt.length} chars`);
// Ensure general_prompt is not empty and gives clear instructions
Error 4: Function Call Timeout
Function call to https://your-api.com/endpoint timed out

Fix: Your function endpoint must respond within 5 seconds. Offload heavy work:

typescript
app.post('/functions/lookup', async (req, res) => {
  // Respond immediately with acknowledgment
  const result = await quickLookup(req.body.args);
  res.json({ result: `Found: ${result.name}` });
  // Do NOT run async work before responding
});
Error 5: Webhook Not Receiving Events
No webhook events received after call

Fix: Set webhook_url on the agent, not just in Dashboard settings:

typescript
await retell.agent.update(agentId, {
  webhook_url: 'https://your-app.com/webhooks/retell',
});
Error 6: Voice Quality Issues
Agent voice sounds robotic/choppy

Fix: Check network latency to Retell servers. Use a voice optimized for your use case. Try different voice IDs.

Output

  • Error identified and root cause found
  • Fix applied and verified
  • Call successfully completed

Error Handling

HTTP CodeMeaningRetryable
400Bad requestNo — fix params
401Invalid API keyNo — fix key
404Agent/call not foundNo — fix ID
429Rate limitedYes — backoff
500+Server errorYes — retry

Examples

Triage a failed outbound call request

When an outbound request returns an error, record the HTTP status, request correlation ID, and the target environment without storing the phone number in the shared incident log. Retry only idempotent requests with bounded backoff; do not retry an ambiguous call-creation response until the provider state is checked. If the error is credential-related, rotate the affected test secret and confirm the replacement against a sandbox agent before resuming traffic.

Resources

Next Steps

For debugging, see retellai-debug-bundle.

© jeremylongshore, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/.curated/retellai-common-errors of jeremylongshore/tons-of-skills-marketplace.

Open the folder on GitHubat commit cfae287

Compare with similar skills

Retellai Common Errors next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Retellai Common Errors compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Retellai Common Errors this skilljeremylongshore/tons-of-skills-marketplace2.8k—~881Automated safety check: PassMIT
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Integrate Whatsapp Callinggokapso/agent-skills177—~2.1kAutomated safety check: PassNone
Tg Bot Opsserejaris/personal-corp-os229—~1.6kAutomated safety check: NotesMIT
Fishjam Python Server SDKsoftware-mansion-labs/skills291—~1.3kAutomated safety check: PassApache-2.0
Agentphonesickn33/agentic-awesome-skills47k3 repos~852Automated safety check: PassMIT

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Categories

Questions about Retellai Common Errors

What does Retellai Common Errors do?

Diagnose and fix Retell AI voice agent errors: call failures, webhook issues, voice quality. Retellai Common Errors is an agent skill from jeremylongshore/tons-of-skills-marketplace. Diagnose and fix Retell AI voice agent errors: call failures, webhook issues, voice quality.

When should I use Retellai Common Errors?

Retellai Common Errors fits situations like: encountering Retell AI errors; debugging call issues; troubleshooting agents; with phrases like retell error.

How do I install Retellai Common Errors in Claude Code?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill retellai-common-errors -a claude-code`. Or copy the skill folder (skills/.curated/retellai-common-errors in jeremylongshore/tons-of-skills-marketplace) into .claude/skills/retellai-common-errors in your project. Claude Code loads it when a task matches its description.

How do I install Retellai Common Errors in Codex?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill retellai-common-errors -a codex`. Or copy the skill folder (skills/.curated/retellai-common-errors in jeremylongshore/tons-of-skills-marketplace) into .agents/skills/retellai-common-errors in your project. Codex loads it when a task matches its description.

Can I use Retellai Common Errors in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill retellai-common-errors -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/retellai-common-errors, .gemini/skills/retellai-common-errors, .github/skills/retellai-common-errors and .opencode/skills/retellai-common-errors in your project.

What does Retellai Common Errors need to run?

Going by SKILL.md and its folder, Retellai Common Errors needs credentials named RETELL_API_KEY. Our summary lists: A credential in RETELL_API_KEY. Its frontmatter pre-approves these tools: Read, Grep, Bash(curl:*). Compatibility (from SKILL.md): Designed for Claude Code.

Does Retellai Common Errors access the network?

SKILL.md names 2 domains. As links in the text: docs.retellai.com and npmjs.com. This is read from the text; nothing was executed.

Is Retellai Common Errors safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Retellai Common Errors use?

Retellai Common Errors is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Retellai Common Errors use?

About 881 tokens (SKILL.md is roughly 3.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Retellai Common Errors?

Skills that share tags, products or a category with Retellai Common Errors: Make Scenario Operations (integromat/make-skills, 128 stars), Integrate Whatsapp Calling (gokapso/agent-skills, 177 stars), Tg Bot Ops (serejaris/personal-corp-os, 229 stars) and Fishjam Python Server SDK (software-mansion-labs/skills, 291 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Retellai Common Errors?

jeremylongshore (a GitHub user) maintains it in jeremylongshore/tons-of-skills-marketplace, which has 2,827 GitHub stars. The repository holds 3,342 skills in this directory. The repository was last updated on October 10, 2026.

Source: jeremylongshore/tons-of-skills-marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.