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 harshithsunku/mcp-gtags-server --skill c-code-navigationgit clone --depth 1 https://github.com/harshithsunku/mcp-gtags-serverWrote 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/harshithsunku/mcp-gtags-server/c-code-navigation)<a href="https://agentmods.dev/skills/harshithsunku/mcp-gtags-server/c-code-navigation"><img src="https://agentmods.dev/badge/skills/harshithsunku/mcp-gtags-server/c-code-navigation/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/harshithsunku/mcp-gtags-server/c-code-navigation"><img src="https://agentmods.dev/badge/skills/harshithsunku/mcp-gtags-server/c-code-navigation.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 | $0.00059 | $0.00805 |
| Opus 5.5 | $0.00024 | $0.00322 |
| Sonnet 5.5 | $0.00012 | $0.00161 |
| Haiku 4.5 | $0.00006 | $0.00081 |
Grade A, and why
c-code-navigation scanned grade A with 0 findings 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 64 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Navigating C/C++ code with an index
These tools answer from a GNU Global index built from the source itself: no
build, no compile_commands.json, every #ifdef variant of every config.
Results come back as compact path:line: source rows.
Which tool for which question
| Question | Tool |
|---|---|
| Who calls this function? What would this change break? | find_callers (dedupes per calling function, shows each call's source line) |
| Where is this defined? What is it? How widely used? | find_definition (definitions + #ifdef guards + usage summary) |
| Every usage, including in a specific directory | find_references (path_prefix="fs/ext4", group_by) |
| What does this function call? | find_callees |
| Can A reach B, and through what? | reachability |
| Show me the implementation | get_symbol_body (the body only, not the file) |
| What does this file define? | list_file_symbols |
| I just edited files and need fresh results now | update_index |
Keep using grep for string literals, comments, log messages, Kconfig and Makefiles, and anything that is not a C/C++ symbol. Grep is one cheap call for those; these tools win when the answer is a symbol relationship or when grep would return hundreds of lines.
Reading the output
path:line: source line [kind; #if CONFIG_X] — the tag shows what the symbol
is and the #ifdef stack it lives under. A footer like
[1-100 of 5290 · offset=100 for more] means there is another page. Results
end with next: naming the most useful follow-up tool. Pass format="json"
if you need to parse the envelope instead.
Rules that save round-trips
- Pick the repository explicitly when more than one is open, or when the
server reports it cannot determine one:
project_root="/abs/path/to/repo". - Hot symbols: over 200 references come back grouped by file. Narrow with
path_prefixrather than paging through thousands of sites. - First query on a new repository may answer "indexing in progress" — the index is building in the background; retry shortly.
- Kernel specifics: pass
active_config="/path/to/.config"to drop definitions your config cannot compile; macro-generated names resolve to their generator site (flaggedresolved_via).
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 · 64 lines · 59 tokens per session scan A d5daccb878da
c-code-navigation is a skill published in the GitHub repository harshithsunku/mcp-gtags-server (1 stars, last pushed 1mo ago), licensed MIT. It adds 59 tokens to every session and 805 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-18.
c-code-navigation compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| c-code-navigationharshithsunku/mcp-gtags-server | Skill | 1 | 1mo ago | MIT | A | 59 | Claude Code |
| torchtalk-analyzeropendatahub-io/ai-helpers | Skill | 39 | 3d ago | Apache-2.0 | A | 58 | Claude Code |
| torchtalk-traceopendatahub-io/ai-helpers | Skill | 39 | 3d ago | Apache-2.0 | A | 24 | Claude Code |
| grepai-languagesyoanbernabeu/grepai-skills | Skill | 20 | 8d ago | MIT | A | 26 | Claude Code |
| unreal-live-codingItalink/UnrealClientProtocol | Skill | 130 | 2mo ago | MIT | A | 44 | Claude Code, Codex |
| unreal-engine-cpp-blueprintshamzabellouch/agent-skills | Skill | 8 | 22d ago | MIT | A | 50 | Claude Code, Codex |
| esp32-arduino-embedded-chamzabellouch/agent-skills | Skill | 8 | 22d ago | MIT | A | 71 | Claude Code, Codex |