Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add aadilr/changethisfile-mcp --skill file-conversiongit clone --depth 1 https://github.com/aadilr/changethisfile-mcpWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/aadilr/changethisfile-mcp/file-conversion)<a href="https://agentmods.dev/skills/aadilr/changethisfile-mcp/file-conversion"><img src="https://agentmods.dev/badge/skills/aadilr/changethisfile-mcp/file-conversion/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/aadilr/changethisfile-mcp/file-conversion"><img src="https://agentmods.dev/badge/skills/aadilr/changethisfile-mcp/file-conversion.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00093 | $0.00760 |
| Opus 5.5 | $0.00037 | $0.00304 |
| Sonnet 5.5 | $0.00019 | $0.00152 |
| Haiku 4.5 | $0.00009 | $0.00076 |
Grade A, and why
file-conversion scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
3. **Remote file (you have a URL, not a local file)** — skip the download/re-upload; one curl does it: How it starts
The opening of the file, as written. The whole thing — 56 lines — stays where its author put it; the contents beside it link to each section on GitHub.
File Conversion (ChangeThisFile)
Convert files across 1,000+ supported routes using ChangeThisFile. Anonymous conversion is temporarily available in compatibility mode; verified developer keys share quota with REST API usage. Conversions run server-side (FFmpeg, LibreOffice, Calibre, 7-Zip, sharp, Ghostscript); files are deleted within 24 hours.
Decision order
- If ChangeThisFile MCP tools are available (
changethisfile:convert_file,changethisfile:list_conversions) — use them directly.convert_filetakessource_urlORbase64_content+source_format, plustarget_format, and returns a temporary download URL. - Otherwise, use the bundled script (requires network access to changethisfile.com):
scripts/convert.sh <input-file> <target-format> [output-file]
# e.g. scripts/convert.sh report.docx pdf
# prints the output file path on success
The script path is relative to this skill's directory. It base64-encodes the file, calls the hosted MCP endpoint over plain HTTPS, downloads the result, and writes it next to the input (or to [output-file]).
- Remote file (you have a URL, not a local file) — skip the download/re-upload; one curl does it:
curl -sS -X POST https://changethisfile.com/mcp \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"convert_file","arguments":{"source_url":"<FILE_URL>","target_format":"pdf"}}}'
The response text contains a download URL — fetch it with curl -o <output>.
Discovering supported routes
Ask before guessing if a conversion is exotic:
curl -sS -X POST https://changethisfile.com/mcp \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"list_conversions","arguments":{"source_format":"docx"}}}'
Omit source_format for a grouped summary of all supported routes.
Limits and errors
- Max MCP input: 25 MB, including authenticated plans. Larger files should use
POST /v1/convert; verified free keys include 25 conversions/month shared across REST and authenticated MCP. - Rate limit: 5 conversions/minute per IP. On "Rate limit exceeded", wait 60 seconds and retry once.
- "Unsupported conversion: X→Y" errors list the valid targets for that source format.
- Download URLs expire after 1 hour — download immediately, then work with the local file.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 56 lines · 93 tokens per session scan A bca6324778bb
file-conversion is a skill published in the GitHub repository aadilr/changethisfile-mcp (6 stars, last pushed 13d ago), licensed MIT. It adds 93 tokens to every session and 760 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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