Anvil

Anvil — connector documentation

• MCP endpoint: https://anvil.connectorbay.com/mcp
• REST API: POST https://anvil.connectorbay.com/v1/tools/{tool_name}, described by the OpenAPI 3.1 spec at https://anvil.connectorbay.com/openapi.json
• Transport: Streamable HTTP, stateless, MCP specification 2025-06-18 or later
• Authentication: none required. An optional Authorization: Bearer <key> raises rate limits.
• Health: https://anvil.connectorbay.com/health · Tool schemas: https://anvil.connectorbay.com/tools.json
• Publisher: Unify Dynamics LLC · connectorbay.com/anvil · agent@connectorbay.com

What Anvil is for

The hobby blacksmith/metalworker's quick reference — which metal to reach for and how hot to get it, what a technique or shop term actually means, why you anneal before you harden, whether a project is a sane first pick or a stretch goal, what the color of your steel is telling you, and why that last blade warped in the quench — answered instantly from one hand-curated, cross-checked toolbox.

What it does

General properties, hardness, workability, and typical forging suitability for 6 metals a hobby smith commonly meets — mild steel, wrought iron, tool steel (1084/W1), copper, brass, cast iron (metal_guide); each metal's typical forging/working temperature range in both Fahrenheit and Celsius (forge_temperature_guide); a description and difficulty rating for 6 core techniques — drawing out, upsetting, punching, drifting, forge welding, twisting (technique_guide); definitions for 16 shop terms — anvil, hardy hole, pritchel hole, hot cut, fuller, swage, tongs, slack tub, and more (tool_glossary); a plain explanation of annealing, normalizing, quenching, and tempering, and why each is done (heat_treatment_guide); a beginner/intermediate/ advanced difficulty rating with reasoning for 6 classic first projects — S-hook, bottle opener, leaf, nail, wall hook, knife blank (project_difficulty_guide); general forge and anvil safety awareness covering eye/ ear/hand protection, natural-fiber clothing, fire safety, and ventilation (safety_guide); the standard steel color-to-approximate-temperature reference from black through white heat (color_temperature_chart); and likely cause plus a prevention tip for common hardening/quenching problems — warping, cracking, soft spots, scale buildup (hardening_troubleshooting).

What it is not

Not a substitute for supervised instruction, a manufacturer's heat-treat spec sheet, or your own judgment and safety gear at the forge. Forging temperature ranges, the color-temperature chart, and heat-treatment guidance are hand-curated general reference figures, cross-checked against multiple publicly published blacksmithing and metallurgy sources — real results vary by fuel, specific alloy, ambient lighting, and technique, so always confirm against your own stock and equipment. Anvil does not sell tools, metal stock, or fuel and has no affiliation with any forge, tool, or steel brand named in its guides.

Tools

Materials

metal_guide — General properties, hardness, workability, and typical forging suitability for a metal a hobby smith commonly works (6 metals covered). Use for "how hard is 1084", "is copper easy to forge", "what is cast iron used for". Args: name.

forge_temperature_guide — The typical forging/working temperature range for a metal, in both Fahrenheit and Celsius, with a short note on how it behaves at heat. Use for "what temperature do I forge mild steel at", "can you forge cast iron", "how hot does brass need to be". Args: metal.

Technique

technique_guide — A general description and difficulty level for a core blacksmithing technique (6 techniques covered). Use for "what is drawing out", "how hard is forge welding", "how do you twist a bar". Args: name.

heat_treatment_guide — A general explanation of a heat-treatment process and why it's done (annealing, normalizing, quenching, tempering). Use for "what's the difference between annealing and normalizing", "why do you temper steel after quenching". Args: process.

project_difficulty_guide — Beginner/intermediate/advanced difficulty tier and brief reasoning for a classic first blacksmithing project (6 projects covered). Use for "is an s-hook a good first project", "how hard is a knife blank". Args: project.

Safety & Reference

safety_guide — General forge and anvil safety awareness: eye/ear/hand protection, clothing (natural fibers, avoid synthetics near forge heat), fire safety, and ventilation. Use for "what should I wear at the forge", "is it safe to forge in my garage".

color_temperature_chart — The standard steel color-to-approximate-temperature reference, from black heat through white (forge-welding) heat, in both Fahrenheit and Celsius. Use for "what color is 1500 degrees F", "what temperature is orange heat".

hardening_troubleshooting — Likely cause and a prevention tip for a common heat-treating/quenching problem (warping, cracking, soft spots, scale buildup). Use for "why did my blade warp during the quench", "how do I stop scale buildup". Args: issue.

Glossary

tool_glossary — Definitions of common blacksmithing shop terms and tools (anvil, hardy hole, pritchel hole, hot cut, fuller, swage, tongs, slack tub, and more — 16 terms covered). Use for "what's a hardy hole", "what's a slack tub". Args: term.

Conventions

• Read-only. Every tool reads public data or computes; nothing is written anywhere and nothing about the user is stored.
• Result envelope. ok: true with data, or ok: false with a structured error (bad_input, not_found, upstream_error). degraded lists optional sources that were unreachable.
• Rate limits. Free tier 60 tool calls/minute and 300/day per user (keyed on the user identifier supplied by the host agent, else client IP); Pro keys raise this. Over-limit calls return HTTP 429 with Retry-After. initialize and tools/list are never counted.

Support

agent@connectorbay.com · connectorbay.com/anvil/support

Anvil — Privacy Policy

Effective 24 September 2026. Unify Dynamics LLC ("we", "us"), Menlo Park, California.

What Anvil is. Anvil is a connector (an MCP server and REST API) that AI assistants and personal agents call on your behalf for a fully local blacksmithing/metalworking hobby reference toolkit: a metal properties guide, forging temperature ranges, a technique guide, a tool glossary, a heat-treatment guide, project difficulty ratings, a safety guide, the steel color-temperature chart, and hardening troubleshooting. You interact with your assistant; the assistant sends us only the arguments needed for that one lookup.

What we receive. The arguments of each tool call — a metal name, a technique, a glossary term, a heat-treatment process, a project name, or a troubleshooting issue — the technical headers needed to serve the request (an IP address or a client identifier supplied by the assistant, and a Pro API key if you have one), and standard server logs.

Everything is answered from bundled reference data, and nothing is stored. No request is forwarded to any third party — there is no upstream call at all, live or otherwise — and no query is logged in request bodies, recorded, or used to train anything.

What we do not receive or store. We do not receive your conversation with the assistant or your name, and we do not build a profile from your queries: each request is answered independently and nothing carries over between requests. Rate-limit counters (a client identifier and timestamps) are held in memory for at most 24 hours. Hosting-provider access logs, which contain IP addresses and request paths but not request bodies, are retained for up to 30 days for security and abuse prevention.

Sub-processors. None — the entire dataset is bundled with the server and every lookup runs locally. Hosting: Vercel (United States regions).

Legal bases and your rights. Our processing is necessary to provide the service you request through your assistant. Because we store no personal data beyond short-lived logs, requests to access, correct or delete personal data are usually satisfied automatically; you can still contact agent@connectorbay.com and we will respond within 30 days. We do not sell or share personal information and do not use your data to train models.

Children. Anvil is a general-audience service operated by the adult using the assistant.

Changes. We will post changes here with a new effective date.

Anvil — Terms of Service

Effective 24 September 2026. These terms govern use of the Anvil connector ("the Service") operated by Unify Dynamics LLC ("we", "us").

1. The Service. Anvil returns a fully local blacksmithing/metalworking hobby reference toolkit — a metal guide, forging temperature ranges, a technique guide, a tool glossary, a heat-treatment guide, project difficulty ratings, a safety guide, the steel color-temperature chart, and hardening troubleshooting — from bundled reference data. It is accessed through an AI assistant or directly over MCP or HTTP.
2. Reference, not a substitute for instruction or a safety program. Anvil is an independent hobby reference, not affiliated with or endorsed by any forge, tool, or steel manufacturer. Its forging temperature ranges, color-temperature chart, and heat-treatment guidance are general reference figures, cross-checked across publicly published sources, not lab-exact measurements or a substitute for supervised instruction.
3. Not a safety guarantee. safety_guide is general safety awareness, not a complete safety program. Working at a forge involves real risks of burns, fire, and injury; you are responsible for your own equipment, training, and judgment, and for following your local fire and building codes.
4. Acceptable use. Automated use within the published rate limits is welcome.
5. Availability. The Service is provided "as is" without warranty. We may change, limit or discontinue it at any time.
6. Data. Our Privacy Policy describes what we process. In short: your query is answered from bundled reference data, and nothing is stored.
7. Pro keys. Optional Pro API keys are issued at our discretion, are personal to the holder and may be revoked for abuse.
8. Liability. To the fullest extent permitted by law, Unify Dynamics LLC is not liable for any loss, injury, or property damage arising from use of or reliance on the Service, including any loss arising from a forging, heat-treatment, or safety decision made using its reference figures. Our total liability is limited to US $100.
9. Governing law. California law; venue in San Mateo County, California.
10. Contact. Unify Dynamics LLC · agent@connectorbay.com · https://connectorbay.com/anvil

Anvil support

Email agent@connectorbay.com. We answer within two business days.

• MCP endpoint: https://anvil.connectorbay.com/mcp
• REST API: https://anvil.connectorbay.com/openapi.json
• Live status: https://anvil.connectorbay.com/health

When you report a problem, include the question you asked your agent, roughly when, and which agent you used (for example Claude, ChatGPT or Gemini). Never send us passwords, account numbers or ID numbers. Anvil never asks for them.